Why would some want to take 327 Block and put a 289 crank in it? Thats like "understroking" an engine. I beleive its a 302 but why would someone do this just out of curiousity if anyone could enlighten me.

oh god no,


originally, it's to stay in a class limit. You want larger bore/stroke ratio to have larger valves, but the only reason to lessen cubes, is to stay in the rules of a racing class.

Some things just don't make sense...

because the shorter stroke allows for more reliable high RPM running. To stay under the class limit and still get good power, high RPMs were needed. The old Z28 302's screamed once they got to 4,500 RPM, but were complete dogs below there. high RPM motor are very bad for around town driving. Think about it. How often do you even get to 4500 RPM driving around town?

Let's correct the title, just for the record. It's a 283 crank.

3" stroke.

Had one back in the 70's. Ran okay, but the cam technology of the day and single plane intake made it pretty gutless below 2500 RPMs.

Have to also remember that the 302 was the engine supplied in the '67 and '68 Z/28. Many folks build 302's for the 1st gens for this reason.

RBob.

And what would you do about the mains? Spacer bearings? Are those still available?

No need... when you build a 302 that way, you use a small journal '62-68 327 block, not the large journal '69+ 302/327/350 block. The 283 crank is a forged steel, small journal peice.

Well the reason i ask all this is because i got a "friend" who thinks he knows everything, hes a tire jock at wally world. He has a 305 and now is shooting for a 302. I couldnt understand why so i thought i would ask. But if its for race, and practically race only....then now my questin is why is he bothering. He wants torque not a "bad @ss" high RPM motor in his camaro. He is also expecting to put his stock TPI on this motor.......if only he would listen, or get on here and read and ask questions.

Thanks guys.

If he want's torque, a Chevy 302 is definatly NOT the way to go. Of course, a 302 can be made to run very well on the street, ask any Mustang guy. However if it's torque your buddy is after, a 350 is a much better way to go.

hmmmm short stroke high RPM motor with an induction that is known for gobs of low end torque and runs out of breath at 4500RPM


Sounds like a good combo to me...

When i was 18 -66 now i spent $10,000 to destroke a 327 camel humps 194/160s, 11-1 high domes. Built to nascar specs 7850 max guanteed rpm semi hydraulic lifters, was a screamer scary torque, im now putting it in a 1971 gmc c15 with a m22 rockcrusher tranny best motor never got beat on the street back in the day in a 67 camaro

Digging up bones.The post you answered was from 2006.