[jazric]

I wanted to get some thoughts on whether I'm on the right track with this combo. I just want street fun, little hassle. I'd still like to leave a bunch of rubber on the road though. I think I may be putting too much Carb on this and according to Edelbrock the Performer RPM won't fit under stock hood on 66 Chevelle.

1970 402 (.60 over bore) oval port (2.06/1.72)
posi rear end 3.31 ratio mated to an M20 4 speed
Isky 262-Supercam (2000-5500 rpm) (.488 lift) - their catalog says up to 625 cfm carb?
Edelbrock Performer 2-0, as I said the catalog suggests the RPM version won't fit under my hood, can anyone enlighten?
Holley 4150 HP 750 CFM, mechanical secondaries
Exhaust: super comp hookers to 2 1/2 inch pipes, American Thunder I expect.

The engine is in rebuild stage so I can throw out the cam if that holds me back.

 

[dirtrocker]

What compression do U plan to end up with?

 

[GRN69CHV]

My 402 .030 motor reapsinded real well to a Street Avenger 670 (vac secondaries). I had a 770 on it that I could not get tuned right, then tried a 870 (too much carb), then treid a 670. THe 670 has great throttle response. Best thing is to resist the temptation that you need a lot bigger carb. 625 may be a little small, but I would stay at or under 700.

 

[mr 4 speed]

I'd run a 3310 750 vac. secondary Holley and a Performer intake.
I would run the Comp 270H or or something close (220-230 dur. @ .050 .510-.530 lift)
You'll be fine and be leaving plenty of rubber with 3.31's and an M20 :thumbsup:

 

[jazric]

I'm not sure what the compression will be Dirtrocker? No port work has been done, everything is stock on the bottom end. Maybe 9 or 9.5 ?

 

[SWHEATON]

Chris is right on with his the cam suggestion.

I have a basically stock 69chevelle SS396 4spd m20/3:31'swith 063 lrg oval port heads/stock hi rse cast intake/extrude honed stock exhaust manifolds /flowmasters out the rear with stock 2.5 inch tailpipes/a tweaked q-jet with approx 9:8:1 comp and runs a special purpose comp flat tappet hyd cam with 222/226 deg dur @.05,.525/.525 lift,112 deg L/S angle.

It has a smooth but very authoritative idle with approx 14-15 inches vacuum that lets you know there's something going on under the hood. If you go with much more int dur you will start to drop idle vacuum enough to affect pwr brakes and also start to get a choppy idle too. The motor runs real strong pulling from approx 16-1700rpms-53-5400rpms but it would rpm a little higher like to approx 55-5600 rpms with headers.

I ran a single patt cam in the past with 228 deg [email protected] on 112deg L/S and it had a nasty idle when the motor was not fully warmed up and a choppy idle when up to full operating temp with apporx 12 inch vacuum which was very marginal for my pwr brakes but i did get away without a brake booster vacuum can.

Scott