Originally Posted by moparacer
Originally Posted by AndyF

If you are looking for low to mid 900 HP, using a big bore block, and building with all new parts, then the 572-13 heads are probably a better starting point. Using the better head allows you to soften up the camshaft a little bit which allows the parts to all live longer. So you can make the same power but have a longer life.




I agree it would be easier, but already have 345 CNC-1s on my engine and I was trying to soften the blow to the wallet by reusing them. Going to 572-13s changes everything. I have been 5.47 with my setup at 502 cid with an iron block, and can only go 5.35 on a 8.50 cert so my thinking was 540/aluminum block should put me there pretty easy.

If I was going the 572-13 route I would build a 572 and not a 540.

I really don't want to go much faster in the old crate anyways.... laugh2


Why not put 572 cubes under your 440-1 heads? They may be restricted on max power, but you will see that max power EARLY. Don't forget you will be running less rpm and putting less stress on the motor, which means longer life.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky