oxrabidus

can i use a stock 2.8 flywheel behind a 3.4l without problem, or will it be balanced or something differently? if not could i put a 2.8l clutch on the 3.4l flywheel?
just asking because i can get one for 150, a good running one, and why not you know, its got more power and torque, plus im getting dynomax cat back with no cats... if anyone wonders why? its only 30 more horse or something... just know, it would cost more to fix everything wrong with my 2.8l than putting in this one, and i am DEFINATELY shure it wont last as long as it will take to build my small block...
thanks in advance!

firstfirebird

iTrader: (3)

If your 2.8 is post-1986, then you will be fine. Pre-86 has balancing weight on the flywheel, after that GM internally balanced them.

oxrabidus

so since mine is an 86 i dont have to neutrally balance it or anything?

chevyracingrox

nope, you should be fine just putting your flywheel on the 3.4

oxrabidus

fantastic, and which intake is better? because the one on the 3.4l looks different, is the 3.4l intake better? and can i run it with my stock wringand ecu?

firstfirebird

iTrader: (3)

2.8 intake is better. The LIM are the same between the two, so just swap the middle and upper.

oxrabidus

im just curious... would there be a difference in power? how much if so?
thanks for the info guys.

grimmcs

iTrader: (1)

I thought I had heard once that the 3.4 UIM is had worse flow than the 2.8/3.1...but I dont think that many have tested it. I think it was something about how the intake gets skinnier near the back, and the back runner/s not getting equal air...but like I said, Im not 100%.

Although even if Im wrong, I doubt that the increase would be noticeable.

Found this...

oxrabidus

i will do it and see. plus... the 2.8l intake is prettier...haha... it will be stock minus headers cat back and no cat... either way it will definately be better and more reliable than my 2.8... its about to go... and this one i got only has 80xxx miles on it...