Digger

im building a 350, Just got it bored .030
Im going to have around 10:1 compresion. The heads are 76cc with 2.02 and 1.6 valves, Im going to port these heads heavily. The cam I am going to use is a Comp Cams 270H. The intake is going to be a Edelbrock Torquer and I am going to have a 650 Edel carb on top and headers with straight pipes.How many horses about will this thing produce?

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We'll get out of here, it'll just take a hole lot of floorin.

KIDIROC

I think you might flow more efficiently and possibly pull stronger with 64cc heads vice the 76's, but I'd guess between 300-350 horses. Never over-estimate, you may even put that at the rear wheels.



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Dan Young
1995 Z28/M6
Groton, CT

1984 Z28/A4 - Prospective purchase

Basett Racing

If your going to run 76cc heads I'd highly recommend running .100" or .125" domes . I'm running .125"'s yeilding 9.87:1 compression ratio on 93 octane with no problem. Since your already porting the heads, polishing the combustion chambers will minimize the chance of detonation. My car ran 13.19@103 w/ the same set-up in my sig except for a 2400 stall and 3.42 gears. It was very streetable with that set-up and I drove it on the street alot. I changed the gear and stall in preparation for the 383 I'm installing now.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET: 12.52@107.2
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 15.03@92.7
http://www.bassettracing.cz28.com

KIDIROC

Sorry, I missed two very important words in your message, the word "heavily" behind "port" and the "torquer" behind "edelbrock". Sorry. Is this a non-smog motor? With the dualies, I'm gonna assume so, and up the ante to more like 370. Possibly even close to that at the rear wheels. Depending on if it's gonna be a CNC job or not, I'd say you're right on the money with the 76cc heads, damn, I'll bet that's gonna be nice. Be sure to let us know how that turns out!



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Dan Young
1995 Z28/M6
Groton, CT

1984 Z28/A4 - Prospective purchase

Basett Racing

According to www.prestage.com , My car at a 3300# race weight, and my best ET , the 12.52 pass, my car is making 332 HP at the rear wheels. This is supposed to be a pretty accurate NHRA accepted formula. Multiply that by 1.15 (that's assuming that rear wheel HP is 85% of flywheel HP, which is probably pretty close, considering I have no power steering, air etc.) the car is making 381 flywheel power, So KIDIROC'S 370 HP estimate is certainly realistic. My only major difference is a 650 Demon compared to the 650 Edelbrock you plan on using, they're both rated 650cfm, but beleive me there's no comparison in true flow and performance. I personally would recommend a Holley or A Demon, but if you plan driving this a lot then the Edelbrock would be more econmical, but you'll give up a little power.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET: 12.52@107.2
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 15.03@92.7 http://www.bassettracing.cz28.com

[This message has been edited by Basett Racing (edited January 07, 2001).]

Digger

This car is not going to have any emmisions stuff of any sort. I live in canada on the prairies, nobody cares. As a matter of fact when sombody talks about emmisions stuff I have absolutley no idea what they are talking about.Anyway this is going to go into my 82 Z28 it has a 4 speed standard and posi. And a correction my intake valves are 1.94

Basett Racing

Mine's in a 82 Z28 also, but I have a TH350 w/ 4000 stall. Mine also has 1.94 X 1.50 valves so you should still be making some serious power. I port matched mine to a 1205 Fel-pro intake gasket, which required raising the top of the intake port about .100". I raised the top all the way back to the valve guide boss, rounded and reshaped the boss. I didn't widen the sides too, much, just enough to clean up the rough casting all the way back into the port. Under the valve and the short side radius is where most of the flow is at anyway. I took out all the rough matierial in the valve pocket, it's consistently, all the way around, about as big as the valve seat opening . There's also a big hump or ridge up in the short side radius of factory GM heads, and you need to smooth and blend this down right above the valve seat. Be careful, its easy to hit a valve seat. I also polished the combustion chamber and exhaust port. Leave the intake port with a medium sandpaper finish. My car has a cast crank, a set of regular Chevy X rods rods w/ ARP bolts, 2 bolt main, 1.94 X 1.50 valved budget small block. I don't even have roller rockers on this engine. I put this engine in, after the 305 blew up, to be able to drive and run the car while I was building my 383. Its (the 350)was about a $900 buildup, not counting induction and exhaust, and its a pretty quick set-up. This is proof that a well-matched 350 with decent flowing heads can go pretty fast w/o spending several thousand dollars.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET: 12.52@107.2
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 14.91@92.9 http://www.bassettracing.cz28.com


[This message has been edited by Basett Racing (edited January 07, 2001).]