greenturtle05

iTrader: (6)

i have a l31 with .010 ground off the crank speedpro forged pistons. .010,3angle valve job on the heads stock roller lifters comp xe270 cam petronix hei distributor and a holly 670 and 750 carb. tried both carbs and car still dosent have any power. i have the motor in a 1983 chevy caprice. is this a good cam for such a heavy car? i also have a built 700r4 with a 2500 stall in it. and headers.

ZONES89RS

iTrader: (25)

L31 is a vortec 350 right? If so, that cam should work great with those vortec heads, might need to try the timing if it is not running good because that cam will make lots of torque to get even the heaviest of cars rolling.

greenturtle05

iTrader: (6)

yes i have the complete vortec motor. about how much hp/tq should this combo make

Rocko350

you need to address the valvesprings and pushrods if you already haven't. Use oe lt1 spring keepers and retainers, and get the howards 98213 springs from sumit. pick up a set of Comps hardened 5/16 pushrods, mix, repeat, etc......

pancherj

I agree with ZONES...what's the timing look like? I'm guessing the compression is around 9.5:1. With that low compression and that cam, you will want around 12 degrees initial, 34 degrees max (all in by 3000 RPM) and also a vacuum advance hooked up. I had similar issues on the first engine I built. I had the timing set per the factory (6 degrees initial). The car was a turd. An old timer at the track set me straight!

greenturtle05

iTrader: (6)

actually this was my first engine build. since then I've rebuilt 2 more. also i have the 906 heads and not the 062 would this make a big difference?

ZONES89RS

iTrader: (25)

Naaa, i have had both castings, no difference.