Got a car, is my planned motor build too radical?
About a month ago I bought a 69 Z with about a 10 year old resto, NOM 350, X33 coded, M21, 12 bolt with stock 4.11's, nothing to indicate that it was not a real Z. The guy had been showing the car, the 350 that was in it has a lot of chrome, it was painted to match the rest of the car and engine compartment in blue, looked great but it was really nothing special and sounded like a stock p/u motor (cam was maybe 1 size bigger, vortecs that are on it have not been modded for lift) and didn't run hard at all.
Today I got around to calling the guy that had done the resto on it and ask him what happened to the original 302 inch motor. I was betting that it had been run hard and somehow damaged the block or something that would excuse throwing such a thing away, but what the guy told me really shocked me.
He said that it was running and had about 100k when he got the car, but he pulled it and scrapped it in favor of the 350 when he did the resto. I was shocked and asked him why, he started telling me about how small cubes can't make respectable power and nobody can tell the difference by looking at the motor, that the small mill was a waste of a 4 speed and 12 bolt setup, etc. I asked him why he didn't save the original block at least, telling him he could have made a 350 or 383 and still preserve the matching numbers, he responded telling me that I was wrong, it was too small a bore to make a 350 or a 383. Basically, I think he thought it was a 305. I thanked him and hung up.
Right now I'm having the tranny worked over by a friend that has been working on 4 and 5 speeds for a long time and I'm going to put it back together with a new motor: my 350 is a 2 bolt, 80 over, stock cast rotating assembly job from a high volume rebuilder and I don't really trust it to hold together being run in a performance application. My machine shop told me that they'd done some 80 over motors for some cheap asses that ran a fleet once but they agreed that expecting any sort of lifespan out of one was just not possible and that the previous owners of my car were lucky to have gotten the 10k and 10 years out of it that they did.
I'm going to use a SJ 327 block and forged 283 crank, aftermarket splayed 4 bolt main caps, some dart aluminum heads that I bought used(i had them rebuilt), 10.5:1 compression, 300-36 intake, and a solid roller valvetrain. I've never built anything this radical (mostly high torque stuff for mud trucks) but am hoping that all this stuff runs good. A guy I know that has a SBC swapped into a datsun Z car said that this will definately scream, but doesn't know whether a first gen camaro is light enough to work with that type of motor and a nova or a vega might work better with my combo.
I was tired of running out of breath at 45 mi/hr with that 350, but i'm hoping now that I didn't go too far in the other direction. So my question is really aimed at people that have experience with short stroke SBC's because there aren't many people that I know that do- am I going to regret building something with no manners, yet still get my *** whipped by 355s and 383s as the people running those motors claim, or am I running a good enough combo to go hunting for big engines? I have no idea and would hate to have pissed away money on something that just sucks. I guess i can still cam up my 350 (364 lmao) and mill the heads for CR if that is the case.