305 LB9 are slow bull
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Re: 305 LB9 are slow bull
And I bet a N/A 305 bored and blueprinted with good heads and a good cam, headers, new intake and switched carb will beat a supercharged cobra.
and for this fail of a post...
my 88 with a 305 spun ONE tire EVERY time i stomped the pedal, just saying. and i put up smoke too boy, one time i stopped traffic at a VERY busy intersection because noone could see.
and for this fail of a post...
my 88 with a 305 spun ONE tire EVERY time i stomped the pedal, just saying. and i put up smoke too boy, one time i stopped traffic at a VERY busy intersection because noone could see.
And for such a high performance "race car" you had with your 305, you had a one wheel peel axle? Is that a joke man? I too had a built 305, cammed with full bolt ons, 5 speed trans, and a posi rear with 3.23 gears. Made 235 RWHP. You had to dump the clutch for those things to spin, and back when it was auto still, it never spun from a dig.
I will agree with you, cobras are easy to make more power. smaller pulley, new clutch, and a 4.10 rear end and they will get places.
Top I could see a N/a 305 is 400 to the wheel. But I'm pretty sure the 3rd gen f-body weighs a good bit less than the 03-04 mustang
For the spinning tire, I was just stating to that guy that any thirdgen will spin tires, slow or not.
Top I could see a N/a 305 is 400 to the wheel. But I'm pretty sure the 3rd gen f-body weighs a good bit less than the 03-04 mustang
For the spinning tire, I was just stating to that guy that any thirdgen will spin tires, slow or not.
For you talking about failure so much, you spread a lot of it. No aftermarket support for heads on a 305 is the stupidest thing I have ever read in my life. I am almost 100% sure that ANY pair of heads you can put on a 350 you can DIRECTLY bolt on to a 305 also. Meaning that the 305 has possibly the largest aftermarket selection of heads. It's like you say something smart, then follow-up with something abnormally wrong.
By the way you talk, you sure don't sound like you know much about 305's. I was "that guy" who didn't want to listen to the nay sayers about how the 305 couldn't be built to make much power and to just go with a 350. Well the most I ever made out of mine was 235 RWHP after quite a bit of work. I can MAYBE see 300 RWHP with a good intake and better heads....400 RWHP is out of the question.
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Re: 305 LB9 are slow bull
No bobby don't want your crap I like my NEW 3rd gen guts your color don't match my car. And what the F this guy talking bout with the 305 TBI. I don't beleave u would waste that good money on a TBI sould did LB9 heads they are like free and flow better and like was said be4 no proof didn't happen do u know y 305's are talked down on........ small bore long stroke witch meens small bore no tork long stroke no high revs no HP so a motor with the odds against it no place for hp or tork what's it good for. Look ppl this is it I but my hand to GOD what I said was 100% true and it is a 305 (by the head casting#) I have the tire marks to prove the rubber laying at the line the first race against a modded 08 GTI, two tire marks for 15ft on new tires. And 1.94 is most 305, 350 intake valve size, 2.02 will hit on 305. All y'all say y'all has millions of year of expo it don't seem like it y'all heads are to far up your bun holes I'm sure some of y'all cars are stock, and or never driven/ raced a R/T I driven more than I raced with them floored they feel faster than my car but on the streets the loose they are high 13s low 14s cars to the everyday driver they guys I raced was not real racers mostlikely leasing their cars. But the comments said about the recored race with the 93 Z28 I stopped caring with that proof y'all still said no so if I dynoed it that would be a lie to y'all I don't have s h I t to prove to y'all. Stop hating
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Re: 305 LB9 are slow bull
305's are 1.84 and 350 tpi heads are not 2.02 on the intake valves ,they are 1.94. What are the casting numbers on your heads? Just pull a valve cover and see. I suspect u have aftermarket heads if u are as fast as you say.
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Re: 305 LB9 are slow bull
a tbi 305 can be built to "run" as well ,just look at this article.http://www.chevyhiperformance.com/te...i/viewall.html
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Re: 305 LB9 are slow bull
i raced a friends dodge ram rumble be on the interstate, he was following me as we got off the on ramp and i mash'd it and had er up around a hundred about the same time he did but from there i pulled away
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Re: 305 LB9 are slow bull
Stockers I pulled the valve covers and they are stockers 1.84 1.50 I have sm 113s I putting on and I gasket matching them. I would tell some other races I had on 7cyl but I would get kicked of tgo. I don't know why I won maybe all the cars I raced pittied the 3rd gen and let off the gas and faked the anger off losing to a 305
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Re: 305 LB9 are slow bull
I beat this and that means crap to be honest. Take your 305 to the track and come back to report.
I had my old 92 way past what you had and it was still slow. mid to low 14s at best. I never touched the heads but I know my EBL and LT1 cam did alot to it.
I am willing to bet money Sojer does not have a 305 in there, even then coming and bragging about a car you bought and know nothing about is a
to me.
I had my old 92 way past what you had and it was still slow. mid to low 14s at best. I never touched the heads but I know my EBL and LT1 cam did alot to it.
I am willing to bet money Sojer does not have a 305 in there, even then coming and bragging about a car you bought and know nothing about is a
to me. 
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Re: 305 LB9 are slow bull
I honestly doubt a "built" 305 would even beat a stock 03-04 cobra. Unless it was a boosted 305. Many people say those cars were rated at 390 HP but were under rated from ford.
And for such a high performance "race car" you had with your 305, you had a one wheel peel axle? Is that a joke man? I too had a built 305, cammed with full bolt ons, 5 speed trans, and a posi rear with 3.23 gears. Made 235 RWHP. You had to dump the clutch for those things to spin, and back when it was auto still, it never spun from a dig.
Don't say an N/A 305 WILL beat a cobra either till you get your facts straight. Goes both ways, and I'm sure it's going to be a long time before we see some proof of an N/A 305 taking an 03-04 cobra.
I'd love to see 400 RWHP out of an N/A 305. I think you should give it a shot and let us all know how ya make out, LMAO. Your good for laughs, thats for sure.
Obviously any 350 head will BOLT onto a 305, but the small bore means valve size is a problem, so therefore your head choices are limited to only a few with smaller than 2.02 valves, which is the standard SBC size. But it doesn't matter whether you had a killer head or not. The small displacement of the 305 doesn't need a high flow head because it'll never use the extra airflow. Again, try to make 400 RWHP on a 305 and let us know how it goes. Good luck and may god be with you. Your gonna need it for that task.
By the way you talk, you sure don't sound like you know much about 305's. I was "that guy" who didn't want to listen to the nay sayers about how the 305 couldn't be built to make much power and to just go with a 350. Well the most I ever made out of mine was 235 RWHP after quite a bit of work. I can MAYBE see 300 RWHP with a good intake and better heads....400 RWHP is out of the question.
And for such a high performance "race car" you had with your 305, you had a one wheel peel axle? Is that a joke man? I too had a built 305, cammed with full bolt ons, 5 speed trans, and a posi rear with 3.23 gears. Made 235 RWHP. You had to dump the clutch for those things to spin, and back when it was auto still, it never spun from a dig.
Don't say an N/A 305 WILL beat a cobra either till you get your facts straight. Goes both ways, and I'm sure it's going to be a long time before we see some proof of an N/A 305 taking an 03-04 cobra.
I'd love to see 400 RWHP out of an N/A 305. I think you should give it a shot and let us all know how ya make out, LMAO. Your good for laughs, thats for sure.
Obviously any 350 head will BOLT onto a 305, but the small bore means valve size is a problem, so therefore your head choices are limited to only a few with smaller than 2.02 valves, which is the standard SBC size. But it doesn't matter whether you had a killer head or not. The small displacement of the 305 doesn't need a high flow head because it'll never use the extra airflow. Again, try to make 400 RWHP on a 305 and let us know how it goes. Good luck and may god be with you. Your gonna need it for that task.
By the way you talk, you sure don't sound like you know much about 305's. I was "that guy" who didn't want to listen to the nay sayers about how the 305 couldn't be built to make much power and to just go with a 350. Well the most I ever made out of mine was 235 RWHP after quite a bit of work. I can MAYBE see 300 RWHP with a good intake and better heads....400 RWHP is out of the question.
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Re: 305 LB9 are slow bull
I know a lot like a lt1 and a L98 cam is bout the same and its a 305 I got the casting number off the heads I don't see a size on the back of the block. If u where buying a camaro or ta witch would u pay more for a 305 or 350.... so why would the seller lie about that he put it in and I asked time again he is 100% sure its a 305 he lost the cam card after buying the car he wanted to buy it back for more I will sell it to him when I build my procharged efi 383 4 about 12k lol
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Re: 305 LB9 are slow bull
first of all this is a great post and for all you guys doubting his wins if you look closely in the vid it looks like you can see he has one of those air fresheners that have the little fan,best mod ever. as i have stated before in another post my tahoe(2004 5.3 with rain ex windsheild wipers) will smoke any ls lt or any v8 thats n/a with my turbo(the air freshner,cherry sent) and rubber black chevy emblem floor mats. oh and i race my tahoe in haul mode. i would post a vid but dont knowhow. 
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Re: 305 LB9 are slow bull
Hey now... he could easily beat my LT1. She's only a little 357 with 23x/24x duration (.050"), .6xx"/.6xx" lift, trick flow heads and 8 Nitrous Outlet nozzles. She's only got about 750-800 horses.
I fear all diesel trucks, Hondas, and tree oh fives while my motor still sits on my engine stand
Edit:
But let's not kid ourselves; I have read articles of circle track 305's turning ridiculous RPMs and making 550+ horses N/A.
I fear all diesel trucks, Hondas, and tree oh fives while my motor still sits on my engine stand
Edit:
But let's not kid ourselves; I have read articles of circle track 305's turning ridiculous RPMs and making 550+ horses N/A.
Last edited by zraffz; Feb 11, 2012 at 02:21 PM.
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Re: 305 LB9 are slow bull
For all of you doubting the 305. My original motor a 305 TBI with ported & polished SWIRL PORT garbage heads, 3" exhaust, headers, custom fog light intake( pro **** ), ignition box, new tune, 700r4 transmission, and the best of the best weight reduction( all i had was 1 seat, a steering wheel and shifter, drilled rotors etc..). With this in my 88 trans am, I beat numerous turbo civics/integras/rice cans, charger r/t's all day theyre slow as ***** (NOTICE r/t NOT SRT), 2000-2004 cobras, any other stock 305 tbi, 90+ ss's, anything under 330 range HP, i simply trashed. and I probably had 250? I even **** on most turbo diesel chipped trucks, and they get fast, believe me. 305 is a good capable motor with the RIGHT mods.
This is the post of the year and we're only in February Supreme Member
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Re: 305 LB9 are slow bull
And for such a high performance "race car" you had with your 305, you had a one wheel peel axle? Is that a joke man? I too had a built 305, cammed with full bolt ons, 5 speed trans, and a posi rear with 3.23 gears. Made 235 RWHP. You had to dump the clutch for those things to spin, and back when it was auto still, it never spun from a dig.
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Re: 305 LB9 are slow bull
Right now, my palm is to my forehead, I am shaking my head back and forth in disbelief. Somebody lock this thread already please....
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Re: 305 LB9 are slow bull
Hey now... he could easily beat my LT1. She's only a little 357 with 23x/24x duration (.050"), .6xx"/.6xx" lift, trick flow heads and 8 Nitrous Outlet nozzles. She's only got about 750-800 horses.
I fear all diesel trucks, Hondas, and tree oh fives while my motor still sits on my engine stand
Edit:
But let's not kid ourselves; I have read articles of circle track 305's turning ridiculous RPMs and making 550+ horses N/A.
I fear all diesel trucks, Hondas, and tree oh fives while my motor still sits on my engine stand
Edit:
But let's not kid ourselves; I have read articles of circle track 305's turning ridiculous RPMs and making 550+ horses N/A.
But 95% of the 305 owners on this board will never modify it correctly with the right budget because if you are going to spend that much in search of power it makes little sense not to swap to a 350 and gain the cubes without any weight gain, or to swap out to a different generation engine.
the Thirdgen's biggest enemy to power is its poor flowing heads (compared to todays Gen3/4 heads) and the intakes. The aftermarket has addressed all of these issues, its just a matter of spending the money and intelligently modifying with a goal in mind.
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Re: 305 LB9 are slow bull
Hey I had swirl port heads with some exhaust port deburing on a 350 with a mild cam and it was a heck of a street car motor. For a budget built motor it would roast the tires pretty hard - went 14.9? at 78ish MPH not being able to grab 2nd gear and having a large amount of difficulty grabbing third. Of course the trans mount busted the only pass I ever got to make (might I add I found a vacuum leak between the intake and carb when I took it apart).
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Re: 305 LB9 are slow bull
Originally Posted by thebuffalo
For all of you doubting the 305. My original motor a 305 TBI with ported & polished SWIRL PORT garbage heads, 3" exhaust, headers, custom fog light intake( pro **** ), ignition box, new tune, 700r4 transmission, and the best of the best weight reduction( all i had was 1 seat, a steering wheel and shifter, drilled rotors etc..). With this in my 88 trans am, I beat numerous turbo civics/integras/rice cans, charger r/t's all day theyre slow as ***** (NOTICE r/t NOT SRT), 2000-2004 cobras, any other stock 305 tbi, 90+ ss's, anything under 330 range HP, i simply trashed. and I probably had 250? I even **** on most turbo diesel chipped trucks, and they get fast, believe me. 305 is a good capable motor with the RIGHT mods.
______________________________________
I didn't realize that a 2003-2003 Cobra which is underrated from the factory at 400hp is actually only 330hp. You learn something new everyday huh?
A '98+ LS1 fbody could beat 99% of the 305 cars on this site in the quarter mile even if they started in 2nd gear.
For all of you doubting the 305. My original motor a 305 TBI with ported & polished SWIRL PORT garbage heads, 3" exhaust, headers, custom fog light intake( pro **** ), ignition box, new tune, 700r4 transmission, and the best of the best weight reduction( all i had was 1 seat, a steering wheel and shifter, drilled rotors etc..). With this in my 88 trans am, I beat numerous turbo civics/integras/rice cans, charger r/t's all day theyre slow as ***** (NOTICE r/t NOT SRT), 2000-2004 cobras, any other stock 305 tbi, 90+ ss's, anything under 330 range HP, i simply trashed. and I probably had 250? I even **** on most turbo diesel chipped trucks, and they get fast, believe me. 305 is a good capable motor with the RIGHT mods.
______________________________________
I didn't realize that a 2003-2003 Cobra which is underrated from the factory at 400hp is actually only 330hp. You learn something new everyday huh?
A '98+ LS1 fbody could beat 99% of the 305 cars on this site in the quarter mile even if they started in 2nd gear.
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From: Chicagoland Suburbs
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Re: 305 LB9 are slow bull
Originally Posted by thebuffalo
For all of you doubting the 305. My original motor a 305 TBI with ported & polished SWIRL PORT garbage heads, 3" exhaust, headers, custom fog light intake( pro **** ), ignition box, new tune, 700r4 transmission, and the best of the best weight reduction( all i had was 1 seat, a steering wheel and shifter, drilled rotors etc..). With this in my 88 trans am, I beat numerous turbo civics/integras/rice cans, charger r/t's all day theyre slow as ***** (NOTICE r/t NOT SRT), 2000-2004 cobras, any other stock 305 tbi, 90+ ss's, anything under 330 range HP, i simply trashed. and I probably had 250? I even **** on most turbo diesel chipped trucks, and they get fast, believe me. 305 is a good capable motor with the RIGHT mods.
______________________________________
I didn't realize that a 2003-2003 Cobra which is underrated from the factory at 400hp is actually only 330hp. You learn something new everyday huh?
A '98+ LS1 fbody could beat 99% of the 305 cars on this site in the quarter mile even if they started in 2nd gear.
For all of you doubting the 305. My original motor a 305 TBI with ported & polished SWIRL PORT garbage heads, 3" exhaust, headers, custom fog light intake( pro **** ), ignition box, new tune, 700r4 transmission, and the best of the best weight reduction( all i had was 1 seat, a steering wheel and shifter, drilled rotors etc..). With this in my 88 trans am, I beat numerous turbo civics/integras/rice cans, charger r/t's all day theyre slow as ***** (NOTICE r/t NOT SRT), 2000-2004 cobras, any other stock 305 tbi, 90+ ss's, anything under 330 range HP, i simply trashed. and I probably had 250? I even **** on most turbo diesel chipped trucks, and they get fast, believe me. 305 is a good capable motor with the RIGHT mods.
______________________________________
I didn't realize that a 2003-2003 Cobra which is underrated from the factory at 400hp is actually only 330hp. You learn something new everyday huh?
A '98+ LS1 fbody could beat 99% of the 305 cars on this site in the quarter mile even if they started in 2nd gear.
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Re: 305 LB9 are slow bull
man this thread has been around for 3 months.... would of never bet on that...
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Re: 305 LB9 are slow bull
Lol this thread is too good. I love reading it. I sold my 88 iroc to my buddy when I bought my 94 lt1 6 speed z/28. For shots and giggles we raced. My second day ever driving stick I beat him by a long shot.
Shoulda told him to take out his interior. THAT is the key to a 400hp 305
Shoulda told him to take out his interior. THAT is the key to a 400hp 305
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Re: 305 LB9 are slow bull
Well my GTP with nothing more than a Tornado Air System ***-raped a Ferarri F430 so **** you guys.
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Re: 305 LB9 are slow bull
Lol this thread is too good. I love reading it. I sold my 88 iroc to my buddy when I bought my 94 lt1 6 speed z/28. For shots and giggles we raced. My second day ever driving stick I beat him by a long shot.
Shoulda told him to take out his interior. THAT is the key to a 400hp 305
Shoulda told him to take out his interior. THAT is the key to a 400hp 305
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Re: 305 LB9 are slow bull
Originally Posted by thebuffalo
For all of you doubting the 305. My original motor a 305 TBI with ported & polished SWIRL PORT garbage heads, 3" exhaust, headers, custom fog light intake( pro **** ), ignition box, new tune, 700r4 transmission, and the best of the best weight reduction( all i had was 1 seat, a steering wheel and shifter, drilled rotors etc..). With this in my 88 trans am, I beat numerous turbo civics/integras/rice cans, charger r/t's all day theyre slow as ***** (NOTICE r/t NOT SRT), 2000-2004 cobras, any other stock 305 tbi, 90+ ss's, anything under 330 range HP, i simply trashed. and I probably had 250? I even **** on most turbo diesel chipped trucks, and they get fast, believe me. 305 is a good capable motor with the RIGHT mods.
______________________________________
I didn't realize that a 2003-2003 Cobra which is underrated from the factory at 400hp is actually only 330hp. You learn something new everyday huh?
A '98+ LS1 fbody could beat 99% of the 305 cars on this site in the quarter mile even if they started in 2nd gear.
For all of you doubting the 305. My original motor a 305 TBI with ported & polished SWIRL PORT garbage heads, 3" exhaust, headers, custom fog light intake( pro **** ), ignition box, new tune, 700r4 transmission, and the best of the best weight reduction( all i had was 1 seat, a steering wheel and shifter, drilled rotors etc..). With this in my 88 trans am, I beat numerous turbo civics/integras/rice cans, charger r/t's all day theyre slow as ***** (NOTICE r/t NOT SRT), 2000-2004 cobras, any other stock 305 tbi, 90+ ss's, anything under 330 range HP, i simply trashed. and I probably had 250? I even **** on most turbo diesel chipped trucks, and they get fast, believe me. 305 is a good capable motor with the RIGHT mods.
______________________________________
I didn't realize that a 2003-2003 Cobra which is underrated from the factory at 400hp is actually only 330hp. You learn something new everyday huh?
A '98+ LS1 fbody could beat 99% of the 305 cars on this site in the quarter mile even if they started in 2nd gear.
And I will still say you can get 400+ rwhp out of a tbi305
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Re: 305 LB9 are slow bull
There are a few people on these boards who have taken the TPI intakes and modified them intelligently and produced some incredible numbers. Notice that those threads don't have ANY of the negative comments because they've posted the work that went into these cars and everything they've done adds up. There is no magical HP number that appears out of nowhere.
Those who post outrageous claims and have no way proof except "he said, she said" get ridiculed and laughed at. And the threads degenerate.
Just. Like. This. One.
My LT1 with CAI, exhaust, and tune in my GTA is dropping 13.5's all day long with a best of 13.3 @ ~103, and a WORST of 14.2 @ 100 on worn, rock hard 10yr old street tires. This is the iron headed LT1 with the B-body cam which is about the same size as a TBI350 cam, aka under 200* duration @ .050"
I don't see a TBI350 coming close to those numbers in a full weight car without headwork.
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Re: 305 LB9 are slow bull
You're still wrong. Cobras were made in 1999, 2001, and 2003-2004 that body style. And now way in heck are you going to see a dyno sheet on a 400rwhp 305tbi lol
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Re: 305 LB9 are slow bull
Did not think this was going to be a hot topic if this was youtube I would be paid lol. Any who can I used my stock lifters pushrods and rockers on my 113 heads
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From: Seminole, FL
Car: 88 trans am
Engine: 350sb
Transmission: t400
Axle/Gears: 7.5/2.73
Re: 305 LB9 are slow bull
http://www.popularhotrodding.com/eng...s/viewall.html
Sorry, I don't know about cobras, I hate ford.
If you actually have a 305 and actually plan on keeping it.. get a full roller system, roller rockers, cam, lifters. That will be probably the best thing you will ever do to that motor.
Joined: Sep 2004
Posts: 5,902
Likes: 239
From: Chicagoland Suburbs
Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Re: 305 LB9 are slow bull
http://www.hioutput.com/tech/400hp/400hp.html
http://www.popularhotrodding.com/eng...s/viewall.html
Sorry, I don't know about cobras, I hate ford.
If you actually have a 305 and actually plan on keeping it.. get a full roller system, roller rockers, cam, lifters. That will be probably the best thing you will ever do to that motor.
http://www.popularhotrodding.com/eng...s/viewall.html
Sorry, I don't know about cobras, I hate ford.
If you actually have a 305 and actually plan on keeping it.. get a full roller system, roller rockers, cam, lifters. That will be probably the best thing you will ever do to that motor.
Its never been the displacement that causes problems with the 305, its always been the heads, cam and intake that it comes with. The valve shrouding is not as limiting as the other bottlenecks.
LT1's on stock heads with just a cam, cai, and exhaust will put down anywhere from 300rwhp to 370rwhp. A small LT4 Hot-Cam is often enough for LT1s to produce 320-330rwhp on a dynojet with a full accessory setup.
HotRod did an article on how much boost it would take to blow up a junkyard 5.3L Gen3 SBC. They made a booboo and actually got a 4.8L V8. Naturally aspirated with their intake/cam/head package it made 451hp with a 233* @ .050" cam.
http://www.hotrod.com/techarticles/h...g_bang_theory/
Since the exercise was designed as a strength test for the stock short-block, we opted to make a few changes topside. The stock 5.3L heads were ported by Total Engine Airflow and received larger intake valves and an appropriate spring upgrade. Fel-Pro MLS head gaskets and ARP studs hold the heads on, and the cam is an off-the-shelf 228/230 grind from Comp. The cam was run with a new set of Comp hydraulic roller lifters, as the originals were clogged and unusable, but we retained the stock pushrods and rockers. The final upgrade was a swap of the stock truck intake for a FAST LSXR intake, 75 lb/hr injectors, and matching 102mm throttle-body. In normally aspirated trim, the 5.3 produced 451 hp and 380 lb-ft of torque. It seemed odd to us that the motor produced peak power all the way out at 7,000 rpm, but we had a lot of boost to add and little time to ponder the issue.
Member
Joined: Nov 2011
Posts: 398
Likes: 0
From: manitoba.
Car: 2002 ws6, 2011 sierra 6.2L 6 speed
Engine: ls1
Transmission: M6
Axle/Gears: 3:42's
Re: 305 LB9 are slow bull
if you want to build a good 5.0 gm, use a 350 block with a 283 crank. that way you get to utilize the 4" bore with way better heads. throw the 305 away.
Member
Joined: Jan 2010
Posts: 239
Likes: 0
From: Seminole, FL
Car: 88 trans am
Engine: 350sb
Transmission: t400
Axle/Gears: 7.5/2.73
Re: 305 LB9 are slow bull
Those were FLYWHEEL numbers, not wheel hp numbers. And they were also done without accessories of ANY kind. Look at the pics in the 2nd article. The engine doesn't even spin its own water pump or alternator. The only thing it spins is a harmonic balancer. With that situation 372hp isn't impressive at all. Neither of them used stock heads to make that power, or even the stock intake. In fact the only thing stock about it was the short block.
Its never been the displacement that causes problems with the 305, its always been the heads, cam and intake that it comes with. The valve shrouding is not as limiting as the other bottlenecks.
LT1's on stock heads with just a cam, cai, and exhaust will put down anywhere from 300rwhp to 370rwhp. A small LT4 Hot-Cam is often enough for LT1s to produce 320-330rwhp on a dynojet with a full accessory setup.
HotRod did an article on how much boost it would take to blow up a junkyard 5.3L Gen3 SBC. They made a booboo and actually got a 4.8L V8. Naturally aspirated with their intake/cam/head package it made 451hp with a 233* @ .050" cam.
http://www.hotrod.com/techarticles/h...g_bang_theory/
Its never been the displacement that causes problems with the 305, its always been the heads, cam and intake that it comes with. The valve shrouding is not as limiting as the other bottlenecks.
LT1's on stock heads with just a cam, cai, and exhaust will put down anywhere from 300rwhp to 370rwhp. A small LT4 Hot-Cam is often enough for LT1s to produce 320-330rwhp on a dynojet with a full accessory setup.
HotRod did an article on how much boost it would take to blow up a junkyard 5.3L Gen3 SBC. They made a booboo and actually got a 4.8L V8. Naturally aspirated with their intake/cam/head package it made 451hp with a 233* @ .050" cam.
http://www.hotrod.com/techarticles/h...g_bang_theory/
Member
Joined: Nov 2011
Posts: 398
Likes: 0
From: manitoba.
Car: 2002 ws6, 2011 sierra 6.2L 6 speed
Engine: ls1
Transmission: M6
Axle/Gears: 3:42's
Member
Joined: Jan 2010
Posts: 239
Likes: 0
From: Seminole, FL
Car: 88 trans am
Engine: 350sb
Transmission: t400
Axle/Gears: 7.5/2.73
Member
Joined: Nov 2011
Posts: 398
Likes: 0
From: manitoba.
Car: 2002 ws6, 2011 sierra 6.2L 6 speed
Engine: ls1
Transmission: M6
Axle/Gears: 3:42's
Joined: Sep 2005
Posts: 6,258
Likes: 6
From: O'Fallon, MO
Car: 1991 Z28 convertible built 3/1/1990
Engine: Cammed 6.0L LSX
Transmission: T56
Axle/Gears: custom Ford 8.8", 4.10 gears
Re: 305 LB9 are slow bull
Member
Joined: Apr 2010
Posts: 174
Likes: 0
From: Garden Grove,Ca
Car: 92 RS
Engine: 5.slow
Transmission: 5speed
Re: 305 LB9 are slow bull
And we as a community cant figure out why the Third gens get the rep that they do!!!!!!!Look at who owns these cars!!!!lmfao
Member
Joined: Jan 2010
Posts: 239
Likes: 0
From: Seminole, FL
Car: 88 trans am
Engine: 350sb
Transmission: t400
Axle/Gears: 7.5/2.73
Joined: Sep 2005
Posts: 6,258
Likes: 6
From: O'Fallon, MO
Car: 1991 Z28 convertible built 3/1/1990
Engine: Cammed 6.0L LSX
Transmission: T56
Axle/Gears: custom Ford 8.8", 4.10 gears
Joined: Jul 1999
Posts: 1,992
Likes: 10
From: CT
Car: 1986 Camaro SC
Engine: 305 TPI Procharged D1SC
Transmission: Tremec TKO-600
Axle/Gears: Moser 12 Bolt 3.73 posi
Re: 305 LB9 are slow bull
again you guys are feeding them, obviously they know nothing about cars, as if you have a higher hp then 'x' you would beat them, it's not all about power...
oh i left more then a 100' of rubber in 2nd gear i guess i can beat everyone...
when you start blowing rear ends with power then talk to us about all your 305 power...
your ruining it for us with the actual 305 power
oh i left more then a 100' of rubber in 2nd gear i guess i can beat everyone...
when you start blowing rear ends with power then talk to us about all your 305 power...
your ruining it for us with the actual 305 power
Member
Joined: Sep 2011
Posts: 219
Likes: 0
Re: 305 LB9 are slow bull
I cannot get enough of this thread. It's so good.
By the way. My girlfriends stock 305 with headers made 400 hp today. I removed all the accessories. And put it in the car. Water pump, alt, etc all gone. Drove all the way to work and beat a ctsv. The guy didn't know I was racing, but I smoked him.
By the way. My girlfriends stock 305 with headers made 400 hp today. I removed all the accessories. And put it in the car. Water pump, alt, etc all gone. Drove all the way to work and beat a ctsv. The guy didn't know I was racing, but I smoked him.
Supreme Member
iTrader: (8)
Joined: Dec 2005
Posts: 2,412
Likes: 14
From: Northern CT
Car: 1986 Trans am
Engine: 5.3 LM7
Transmission: T56 6 speed
Axle/Gears: Dana 44 w/ 3.55's
Re: 305 LB9 are slow bull
again you guys are feeding them, obviously they know nothing about cars, as if you have a higher hp then 'x' you would beat them, it's not all about power...
oh i left more then a 100' of rubber in 2nd gear i guess i can beat everyone...
when you start blowing rear ends with power then talk to us about all your 305 power...
your ruining it for us with the actual 305 power
oh i left more then a 100' of rubber in 2nd gear i guess i can beat everyone...
when you start blowing rear ends with power then talk to us about all your 305 power...
your ruining it for us with the actual 305 power
Supreme Member
Joined: Jan 2011
Posts: 1,932
Likes: 9
From: Lynden WA
Car: 84 Trans Am, 84 Fiero, 86 944
Engine: 5.0, 2.5, 2.5
Transmission: 5spd
Senior Member
Joined: Feb 2011
Posts: 653
Likes: 5
From: Long Island, NY
Car: 87 Trans Am, 99 WS6, 16 Mustang GT
Engine: LB9, LS1
Transmission: 700R4, T56
Axle/Gears: 3.42 Posi, 4.10 Posi
Joined: Jul 2003
Posts: 10,521
Likes: 204
From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 305 LB9 are slow bull
Originally Posted by thebuffalo
And I will still say you can get 400+ rwhp out of a tbi305...
Supreme Member
Joined: Nov 2010
Posts: 1,074
Likes: 9
From: VA
Car: 88 camaro irocz
Engine: l98 tpi
Transmission: 700r4
Axle/Gears: 2.77
Re: 305 LB9 are slow bull
what about with a nice cam an vortec heads ?
Member
Joined: Jan 2010
Posts: 239
Likes: 0
From: Seminole, FL
Car: 88 trans am
Engine: 350sb
Transmission: t400
Axle/Gears: 7.5/2.73
Re: 305 LB9 are slow bull
+1 and if you don't want vortech heads, machine the hell out of the stock heads and along with the cam get roller rockers, lifters. Maybe a new crank. And probably switch to carb, i hate computers in my cars. I see 400 being possible