You all have convinced me into buying a factory V8 camaro instead of swapping out the six. I have found two that I like. One is an 82 with a 350. The other is an 84z28 with a 305. I think that Im going to get the 84 cause it is in better shape. But I dont know if I can get good power out of the 305, or if I should drop in a 350? If I could get 300hp out of the 305 I would be happy. comments?suggestions?
thanks

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90 RS
T-TOPS
3.1 V6
RUNS STRONG AT 187,650
ON ORIGINAL ENGINE

 

You can get 325HP out of a 305 - well, at least Car Craft can; and for under $1600 too. Check out my site at: http://members.nbci.com/scauffiel/index.htm under the one of the articles pages...

Steve

 

www.hioutput.com/pete/tech/tech.html
Three engine buildups here, ranging from 290 to 400 hp

Pete

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Pete's Place
HiOutput Virtual Racing Team

 

You could also have a look at
http://www.ozemail.com.au/~jca69/mod.../325hp305.html


RMK

"Thirdgens-for people who simply love the smell of burning rubber in the morning"

 

you can get 425 Hp at the wheels out of a 305 .30 over with a stock crank,heads, and harmonic balancer.

 

Would you care to tell us exactly how?


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Cosmik Debris

 

massive amounts of juice (and only one dyno run 'cause the dyno would be destroyed with flying parts...


seriously ? you can run 10.1 with a 305... I know a guy that did , and unfortunately don't know the details , but it's on a MOTOR alone... no juice and no turbo/supercharger...

 

I hear they're going for about $150...

Sorry, I resisted for three trips to the board, couldn't make it past the 4th...

 

For starters, you need a TPI motor(this one was in an 86 Iroc). This will be the heart for all your horsepower. You're gonna want to get Accel(TPI) components to replace the stock one's. Oversized runners, intake and a 58mm throttle body are a must. 24lbs. injectors help too. Get a chip, pulleys, and any other little bolt on you can find. Do your homework though. Find out what aftermarket parts run with each other well. Get the heads remachined. A little bigger valves was all we did. I can't remember off hand exactly what kind of bearings, pistons,rings and connecting rods were used. I do know that the pistons were 9.5:1. You will definitely need headers, and a three inch exhaust. These headers were edelbrock and so was the cat-back. All emissions legal. It fast passed an E-check. Another thing to make sure of is that it's running cool. This particular car rarely sees 140 degrees. Other than that there's not really anything else off the top of my head. I'm sure that there is but it's all little HP builders. Just bolt on's is all. TPI has a very high Hp potential. In fact this winter, it's project heads, Paxton. However we know some people from the kingdom of high performance who are gonna help me and my uncle build my 91' Z28 and we are guaranteed 500 Hp at the wheels. I had this crazy idea, but it's gonna stay G-14 classified until it all pans out. If it all works out, than our little ("junky") 305's will send Viper's home crying. That 86 Iroc allready runs with them no problem. So an 11 et shouldn't be a problem. Keep me posted on any ideas or knowledge that anyone out there has, because it can all be useful.

 

Not to dis you Z, but I don't see 425RWPH there...based on the mods you listed, you MIGHT break into the 13s. You'll have to do a LOT MORE WORK to break into the 12s...

New heads, new cam and possibly a "power-adder" will be necessary for you to get into the 12s. Stock cam and stock heads (even though "machined/ported") will have to go.

 

I see what you're saying.Once you rebuild something you're already guaranteed more Hp than stock. If you go .30 over that's an automatic 30 more HP. The whole motor was reworked though. Not just bolt on's but the bottom end was completely redone. The car ran with that Viper no problem. I'm not exaclty sure what he ran together to get that HP but I saw the Dyno. Plus he works at Summit so he did alot of research before he built the motor. I am just saying, if those weeny junkstang 302 can have 400+ Hp why could'nt a 305. No body has ever really done it.

 

Another thing is to just know what you're doing. Many people don't know how to build motors, but they think they do so they just jump right into it and mess it up. My family has a history of racing and building BA motors, so I don't see 500 as a problem. Another thing is the fundage. My favorite quote is "Speed is money; How fast do you wanna go?" This will be costly, but well worth it.

 

I disagree that a .030" over bore will add 30 HP by itself (at the crank, let alone the rear wheels).

I also have to disagree with your comment that the TPI is the "heart" of the system. I think it is the "scourge" of the system. Great for low end torque, crap for horsepower.

Also, a bottom end by itself is not going to make much more horsepower. A good bottom end is more for "keeping it together" at high rpms. A good balanced bottom end may free up a few ponies, but not much. It is strictly to keep it from unglueing. A forged crank, forged rods and forged pistons will not add any noticeable amounts of HP over a good balanced bottom end (ignoring swapping the 5.7" rods for 6" rods...which assist in attaining higher RPMS and more HP). A good "tune" will add more HP than just a bottom end.

NOW, a good set of free breathing heads and cam.... NOW WE ARE TALKING....

Again, I am not "dissing" you, I am just sharing my 45 years of wisdom with you and 30+ years of working/building motorcycles and cars. But don't take my word alone, do a little more research and you will see that the key to HP is cam and heads (matched to a good intake). The bottom end is to keep it together AFTER you have the cam and heads that permit the engine to breathe at higher rpms so it can still make HP. The bottom end does nothing for the breathing at the top end. You'll just have an engine capable of remaining together at rpms far in excess of the air flow permitted by the TPI system with its stock heads and cam.

A modified TPI system with the stock heads and cams will get you maybe another 500 rpm, not a lot more HP as I see it.

[This message has been edited by Glenn91L98GTA (edited November 01, 2000).]

 

Had to come over here from the tpi board. After reading this thread I am Really dis appointed with my car(yea right). If .030=30hp. My 383 should have 468hp over the 305 that had 190hp stock in my car. That makes 658hp just from my bottom end. Maybe my driveshaft broke?

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87z 383,afr 190's, crane hyd roller(224/230-.509/.528,112 sep),Ported and polished mini ram, 24lb inj, 3.42 gears, strange 12 bolt, tremec 5spd, , 1,3/4" slp headers.(stock 305 hypercrap chip), other stealth goodies.
Runs 14's all day long.

 

Very good point. I totally agree with the cam and heads needing to be excessively beefed. A huge problem with stroker motors is airflow. Feeding the motor with the proper amount of air can be tricky.

 

OK, I see that I will be able to get good power out of the 305. So Im going to ask a question that no one has responded to yet. I have a 305 carb that a friend gave me. If I change the heads, can I run the TBI off the blown 305 that came with the car? That is, is the block the same, or does it differ between carb/efi?

------------------
90 RS
T-TOPS
3.1 V6

RUNS STRONG AT 187,650
ON ORIGINAL ENGINE
Just got A 91rs W/blown 305, this is my first project car.So, I really need advice.ANY is appreciated!

 

Yes the blocks are the same. The only difference on a Gen I engines is the heads after 1986. They have a different angle for the bolts. You would just need the correct corresponding intake.

 

AAHHHH....
what to run, what to run,
i have a 305 TBI.
was considering going over to tpi because price isnt bad. and there are so much more mod options. fuel pumps, regulators. runners. injectors.

so. very confused.

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91 FireBird 305 V-8
no true mods,
ghetto rigged cold air intake,
People dont have a soul, its just something parents made up to frighten little children, like the boogie man, or micheal jackson..."

GheTTo Riggers INC.
We Make Mcgyver look Like Crap

 

oddly enough this hasn't been mentioned yet.. But you can get a lot more power out of a 350.. j/j.. well not really. You can get good power out of a 305.. but it's still a 305. The MAJOR limiting factor for making power w/ 305's is their small bore limits which heads can be used......and heads are where the power hides.. good heads, w/ matched intake and cam.. = MASSIVE power.. but it's very hard to find good heads for a 305. When I had the 87, and the 305 took a dump.. I called around MANY places to get my machine work done so I could rebuild my 305, w/ cam, intake, and heads redone. It was more expensive to redo the 305 that it would have been to redo a 350. So I got a 350 instead, and saved $600.

Anthony