408 Cam on the way

Idaho said
I repeated the measurements. Repeatability varied by 0.5 degree so I took 4 and averaged.
Intake centerline 103.
Exhaust 113.
That puts my lsa right on the expected 108.

Next issue, I have KB-416 step dish pistons, with the raised step at 0.020" above deck. Hughes website says if they are above deck, use a thicker gasket.
This seems quite a lot above deck to me. I set a head on lightly snugged with 4 bolts and the piston contacts at about 7 degrees before TDC.
I also need to verify which part of the piston to measure from for compression calculation. I think it's the rim above the dish and below the step up area but hoping someone can clarify.

View attachment 1715529067

I forget what heads you are running. If they are not OE iron heads with an open chamber, you need to mill off that quench dome and not run a thicker head gasket.

If you do have open chamber heads then use them as they are.

The only way to know for a fact what your compression ratio is requires you to do a half inch down fill and calculate the volume of the quench dome. Otherwise you’re just guessing.