i built a 67 283 and put it in my 84 z28. its got 041 heads flat top pistons, .422 .444 lift 204 214 duration at .050 cam. summit headers, flowmaster catback. alum intake and q-jet carb off an 87 305 HO. i'm going to get a performer itake and 600cfm performer carb for xmas. what do you think the HP and TRQ will be with this settup when i'm done. ir dosn't run real good right know b/c the mc selenoid isn't working and its dumping a ton of gas in and the headers arn't on yet b/c i need to get a y-pipe bent. thx

 

I don't feel comfortable telling you numbers but I have alot of respect for people working with small v8's. I think you will be around 1:1 with horsepower/displacement.

 

I'm not sure that's enough cam to make 1:1.

What pistons did you use? Flat tops would be required to keep compression reasonably high with the small displacement and 64cc chambers.

My personal bias would be to skip the new intake/carb and fix the CC system. Don't forget if you do go with the Performer carb, you'll need a different distributor (assuming you still have the CC distributor in the car - if not, that's why your MCS isn't working). The stock intake and CC q-jet are quite adequate for a 283 like this.

What "Summit headers" are these? Shorties? Guess I've never researched what they offer. I'd think long tubes would be overkill on a 283. L69/LB9/L98 exhaust manifolds would probably be adequate. But, nice Hedman shorties would be good, too, for about $200 w/y-pipe.

Oh, there wasn't any engine called "HO" in '87. The only carb'd V8 they offered was the LG4. How'd you handle the different angle bolt holes in the intake?

 

what crank was in the 283 again?

 

I think that's enough cam for a 283. There aren't any stock GM cams that big for a 305.

 

Unless those 041 heads were milled down to reduce the chamber volume, your compression ratio is going to be pretty low.
Could have used some 305 heads here to good effect.
Or supercharge the motor.

 

My memeory tells me that 283/302 had the 3.00" stroke. 327 have the 3.25" stroke. And 3.48" for the 350.

 

a73's memory is correct... the 283 was 3.875" bore x 3.000" stroke; the 327 was 4.000" bore x 3.25" stroke; the 302 was the 327/350 bore with the 283 stroke.

I'd guess you'd be able to get about 250 HP max out of the combo you posted, by the time it's in the car and has everything hooked up. For reference I am getting about 265 installed out of a 305, double-hump heads like those, a better cam than yours(212°/218° .520"/.528"), same carb, stock (same) intake, 1-5/8" headers. The motor would probably test close to 300 on a stand, or on Desktop Dyno.

 

the intake wasn't too hard to get on, we just had to grind out the 4 center holes a little. i have been told it should have about 10:1 to 10.5:1 compression. with flat top pistons and the heads were willed down a few times. it has the cc dist on it and everything is hooked up, we can't figure out what the problem is, and i want a new intake and carb anyway partly because it looks like crap and i want to get rid of most of the computer stuff. i can get a new distributer for $30 at the junk yard and put all the new stuff on that. should i get a edelbrock 600cfm or holley 600cfm?

 

A 283 with flat-tops, 4cc valve reliefs, 64cc heads, & .025" (typical) deck clearances will come out to around 8¼:1 compression. I doubt you could get up to more than 9:1 by milling heads.

I'd recommend the Holley carb.

What kind of problems are you having with what you have? If you have a 87 "HO" carb, it would be a Monte Carlo SS one; that's a good carb core as far as how it came. Of course, who knows what might have happened between then and now. But you may find yourself spending money and going backwards if the motor has something else wrong with it.

 

how much more would a 350 or 400 have with this setup?

how much diff would there be between a 350 and 400 and how hard are 400s to find?