compression or flow?

mopfried said

So, if were to put my W2 heads on a 69 340 with stock slugs in them? Would the compression be up to par with a 240-250 duration 550-600 lift cam? Just asking. My 360 is fresh bore. The 340 is very usable.

View attachment 1716190141

View attachment 1716190142

View attachment 1716190143

View attachment 1716190144

Click to expand...

Per the Chrysler book your pistons should be out of the deck about .040 or maybe a bit more if your head gaskets are thicker than .028 or whatever the thickness the book says. It also depends on how much have been milled off the heads.

They should be out of the deck gasket thickness plus the depth of the cut out on the head minus .040 for gasket thickness. That’s assuming you have an .040 gasket. You can use whatever number of gasket thickness you have.

If you have an .080 cut out and a .040 gasket you need to be .080 out of the hole.

Correctly made pistons already have the deck of the piston higher than the rest of the piston.

If you have a .028 gasket and a .060 cutout you’d need to be .048 out of the deck.