1965 426 wedge

[Paul Precht]

Originally Posted by Coleydog

Just looked at both specs 426 has a 2.015 comp height .042 deck with a .020 gasket. 440 has 1.94 ch .027 deck and a .021 gasket. No 440 piston has that ch except the 6 pac but it has valve pockets, a no no. So it’d have to be a .070 over 426 piston with the right numbers on top. What a can of worms.

The 413 industrial or motorhome blocks are the way to go and they are everywhere for a very reasonable price then get the correct approved 426 piston. There are 440 motorhome blocks around that have very little wear and if you get one finished to within 1-2 tenths taper and roundness with the desired hone finish at 4.325" the .005" over standard ring set will make it by a hair, you'll still need to use the approved 426 piston, they'll make it whatever size you want.