Some of you might have read my other posts and I bought a TPI setup and decided not to bother...............I have come to realize it is not worth the hassle for what I need. I am debating on wether or not to buy the GM 350 HO that puts out 330 HP.......... I can get it at my dads cost for $2380.00 plus tax and another $300 for the Vortex intake...... If I just rebuild my 305 is it possible to get 300 hp or more out of it for a cheaper price..........what are some of my options...... Either way my dad is going to rebuild it for me. He is a heavy line Mechanic but he does not know much about aftermarket parts and performance parts that help HP increase...... All opinions would be great.....

 

I think you would spend just about all of the $2300 on the 305 just to get to where the 350 starts on power.

I am up to about $2k on my TBI build up and I wish I had just gotten a 350.

 

I agree. That is a great price on that motor and you should be happy with it. 300hp out of a 305 TBI is possible by limit yourself to that when you can have more from a larger motor.

 

Hey, do u still got that TPI? If u do, u might as well get that SDPC TPI motor. It comes with the hotcam, and makes about 350 HP with bigger runners, and headers

 

Boyd Coddington calls it "Vortex" too


If its simplicty you're after, get that engine. If it's power you want, do it yourself with a junkyard 350. It will save money (probably $500-600).

 

i picked up an 89 l98 motor( 95k) with heads for 125 form some one form this board and i know i can get 300 out of it when i done and it wont cost me 2400 to do this...

heres is my plans

l98 short block ...30 over
ported l98 heads
holley tbi intake
holly 670 tbi
comcams something
compression aournd 10:1
#65 injectors atleast
high fllow fuel pump
lots of tunning of course!!

 

True you will spend about that on the LO3 just to get where the 350 starts its powerband.

Azvolfan,
I've seen and road in that car, and i wouldnt swap engines in it. Being it is a 25th Anv, in emaculant original condition with exception of adding a little more power. It looks good just as it is.

I only have about $1K invested in my 305 the price of the engine plus $500 on heads, $50 cam, and the rest is freemods

 

If I were to find a L98 block had it rebuilt...bore it out.......put VORTEC heads and keep my stock fuel setup........would I get over 300 hp out of it..................????

 

it is possible if you get it tuned right, its all in the tuning. You could put together a 350 TBI with vortec heads, LT1-ZZ4 camshaft, edelbrock intake, exhaust, gears etc. and run anywhere between high 12 and low 17s depending on how well it is tuned. So unless you are going to put alot of time into PROM burning it aint even worth it to go all out on a computer controlled system, especially one with speed density. Im happy with my setup so far with just an off the shelf performance chip. Im not messing with camshafts and heads until i get into PROM burning.

 

Not with the stock fuel set-up. You can use your TBI unit but the ijectors and fuel pump will be maxed out.

 

So even if I were to buy the 350 HO that puts out 330hp what would it actually put out if I dropped it in my car with the stock fuel setup?

 

with good PROM tuning you should be about to make 300HP. Dont worry about the HP numbers so much. Even if it makes 300HP it will still be 130 more than what the L03 makes. Throw on some 3.73 gears, a higher stall torque converter and you should have a car deep into the 13s, and thats a fast street car. Im running 14.7s with my mods and have recently added a performer tbi intake and 2400 stall torque converter and im happy with how my car performs. I could only imagine how it would feel with 130 more HP and alot more torque. So again, dont get caught up with horsepower numbers too much unless you have an all out strip car.

 

Your running high 14s with your stock 305?

 

yeah, 14.791 with the mods in my sig minus the probuilt tranny, act 2400 stall and edelbrock tbi intake.

 

when you gonna get that thing back to the track?

 

So what would you guys suggest.............build up a L98?

 

i went to the track last week but couldnt hook worth ****, and my car was running like **** on the way home and at the track and i found out that my MAP sensor vacuum hose was melted on the egr valve base, LOL. Hopefully ill have some new, good times on memorial day, May 31th

 

see my plans above.. after researching alot thats what i decided to do. It will be alot cheaper for me to do it that way then t buy a creat motor. the trade off is it takes time to get everything togther and done. I think its really up to the person as to what they want..

 

They make aftermarket injectors for TBI fuel setups? Give me a link to check this out!!!!

 

No. You will have to use GM or Holley injectors.

 

isn't holley aftermarket lol, jk. I think turbo city makes a couple special sized injectors.

 

I was waiting for someone to say that I always think of Holley as half and half because of Holley stuff you could get from GM back in the day. I think the turbo city injectors are modified stockers.

 

Ok what is the link? GM actually makes bigger injectors??? I could be wrong but it would seem that it would not make a difference unless I had a programmed ECM or chip............? Right?

 

GM made different TBI injectors for every motor. We can use 350 TBI, and 454TBI injectors from the General provided you do the necessary chip work to make them work. Stock injectors are fine until you are exceeeding 250hp.

 

What kind does Holley Make?

 

Pretty much gm knock offs on a bigger throttle body. like the "5.0" 670tb are our stock injectors (kinda) on a holley 670tb an the "5.7" injectors are just like the ones that came off trucks and caprices but on yet again the holley 670 tb. the horsepower gain isnt so much from the injectors (if you have 5.0 and get the 5.0 670) its from the bigger cfm throttlebody. you know the idea more cfm = more air = more power. but if you have a bigger motor say a 5.7 the 5.0 pod is useless cuase it may suply enough air but not enough fuel thats where the bigger injectors come into play. hope that didnt muddy the water but thats my idea of what the bigger tb and injectors do

 

Stock injectors can handle a ****load of power if you increase the fuel pressure.


and if you are building up the bottom end of a motor dont even bother with a 305.


Now if you are fortunate enough to have a bottom end that happens to be fresh and happens to be a 305 have fun with it. Good way to learn.

I hope to see 12s with mine once my 9" with 3.89s gets here next week. The trap speed to horsepower equations have me at around 330-340 hp with my best trap speed of 104.97

total cash outlay for my 305 buildup was well under a grand. My rear is going to be worth more than twice my motor is lol

dont totally write off the 305 as an alternative. Its a good way to get your chassis and driveline sorted out for a bigger engine later

 

Pablo, you ever get those TBI starting problems fixed? I read a few posts on the Prom board about it.

Also, as far as stock injectors handling a lot of power, I tend to agree with that more now too. As long as you have a fuel pump to back up consistent fuel pressure at higher levels then lower injectors can be used. If anyone wants to read about this check out a thread "Dc" on the prom board about injectors at high duty cycles.

 

What have you done to your 305 to gain that much power?

 

 

Look at his sig. He's naturally aspirated.

He's got 416 heads I think and a cam and single plane intake. Also, he has a carb on there with the TBI computer controlling the ignition timing.

 

hahahaha no NAWS

just ported 416 heads
a warm cam
10:1 c/r
Torker II single plane
edelbrock 600 cfm carb
and the computer still running the spark

Bronyraur (btw I saw where your name originated from kinda surprised me. Was watching and the song remains the same DVD, led zep is a great band)

I think they are onto something with the ground issue. I am going to run an engine to chassis ground soon and i have my fingers crossed that that is going to fix it. When and if I do you guys will be the first to know.

no one has hit 13s with a tbi 305 yet on this board N/A have they? hehehe that might change soon

 

My buddy chuck! should beat everyone to it. He is going for mid 13's and 260 at the wheels.

 

Good call on that one, nobody seems to know what the hell it is, kinda sad how nobody seems to listen to great music anymore. That's a quality DVD too.

And yeah I hope you get there Pablo I want to see somebody with 13's and TBI; I know it can feed that engine of yours if tuned right.

 

Im hopein to shoot for the 13's with my setup wait its not gona be 305 damit! i would really like to see that it would blow the tpi crowd's mind lol. Speeking of engien build up i serached summit and got parts that Shifty and Bron talked about. Got a full rebuild kit ,summit 1103 cam and lifters set,World products S/r torquers 67cc chamber 2.020/1.600 valves,Flowmaster american thunder catback and hooker supercomp long tubes. then i crused on over to jegs and put in the 670tb and the grand total was 2,329.89. then i pluged all the nubmers into the desktop dyno (got it worknig right now) and im useing it as a rough estamate of 358hp and 402 footpounds of torque. not bad not bad at all i have a bunch of money left over (got 3k) so i though as a bounus for myslef id throw in a 2,000 stall converter and posi track unit which brought my total to: 2977.59. well if perdicted right this car will shred into the 13's (hopefuly) with lots of chip tuneing and lots of hardwork. *edit* found that the 1103 cam give me more hp and torque and a smaller stall is better for this app*

 

I would have gone with a little smaller chamber. You should lookinto getting those same heads but with 64cc chambers and a thin head gasket.

 

Intresting!!!!!!!!!!!

 

Sam so far what ive goten out this post is you should probly just build the 350 for 2300 its a great price and with a carb and tbi its a great motor. Its all personal prefrance like me i had a choice 327 350. i took 327 cuase its unique and just a cool build! its short stroke gives me the abilty for some easy but limited power and plus this motor can rev upwards of 10500 which i find extremely cool. but that 330hp doent sound so shabby just think like this whatever you do descide the chip tuneing is gona be hard work and the 350 (beside the 305) will be the easyest chip for you. but think like this if you want a small block theres endless posabilty 305s 327s 350s 400s strokers 283s 262s hell the after market for a small block chevy is so big its insane. you shouldnt rely oh what others tell you. if you want to build a 305 go right ahead mabey you woult get the $ to power ratio like a 350 but it makes you happy and thats truely all that matters. "big displacement = big power" well not with efi say you buy that 350 but you dont burn your own chip then you will be killing your power so its all up to one thing CHIP TUNEING. shifty burned it in my mind and hes oh so right everyone shall know its all in the computer that why it is EFI! this is geting a little longwinded and i will end it here with this. do what YOU want and not what everyone else wants and also burn them chips!

 

Either way I am going to do what I want but I like to know what others have done................My car still has to pass smog and I just want to know my options............I dont want to do nothing stupid!

 

i would jsut buy a new 92-93 caprice L05 engine, throw it in with an Edelbrock carb or performer TBI intake, stock TBI, 350 injectors, sensors and chip and see how you like it. Then gradually mod that engine as you get into PROM burning. You dont want to be one of those guys that throws in heads, cams, intakes and run worse after the mods than they did before them. The engine is not the only thing that will make your car go fast, get some 3.42 or 3.73 gears, a torque converter, headers, 3" exhaust, all those parts doing require any chip tuning. I would not get into cam and head swaps with TBI until you are ready to burn PROMs

 

I agree with the approach vjo90rs8 suggests; it seems the best approach.

Where did you come up with that figure of 10.5k RPM? No way that's ever happening with TBI.