Originally Posted by tdawg
I am looking a good set of heads for our psv8 dirt car we are runing a 355 with a 420/420 lift cam 882 heads with 500 lift valve springs 1.94 intake and 1.500 exhaust. I just want to now if there is a better head. This is our head rule if that will help.
STOCK PRODUCTION CAST IRON HEAD NO MODIFICATION OF ANY KIND NO DOUBLE HUMP OR VORTEC HEADS NO ANGLE PLUG HEADS ON GM CARS. NO CLOSED CHAMBER HIGHPERFORMANCE HEADS SUCH AS 461,461X,041,186,OR 492. NO MINIMUM C.C ON HEADS NO ANGLE MILLING AND NO CUTTING INSIDE THE VALVE POCKET NO THREE ANGLE VALVE JOB . VALVE RULE IS MAX 1.94 INTAKE AND 1.5 EXHAUST.
THANKS FOR ANY HELP.
I find that 882's breath better in the lower lifts than 441's. If you're limited to cam duration; the 882 will do you better especially on a short track. The 441s come alive up on the top lifts .4 to .5 inch. If you can run a long duration cam this will take advantage of this characteristic of the 441.
For compression the 441 offers more meat and can be milled .060 without thinning out the deck to where it can't hold a gasket. The 882 is a thin wall piece that gets rather wobbly when milled beyond dot, oh-thirty. I recommend that the 882 be run a zero deck block and only milled enough to keep it straight.
If I was building this with a cam that is limited to .42 inch lift at the valve, I'd run the 882 head on a pre 1974 zero deck block, flat top pistons, as little gasket as I could get away with, very little milling if any on the head. As much cam duration as I can get away with.