How smooth does the top of the block deck need to be for MLS ?

RustyRatRod said

KB107 .060 over. Un-cut J heads Un-cut block. This cam: Crane Hydraulic Flat Tappet Camshafts 693511 I couldn't find the intake closing event, so I stopped looking. I was playin around on some calculators using .039 for compressed thickness, but without solid numbers, I just don't know.

Click to expand...

RRR and OP, use 61 ABDC for the ICA for this cam. (It can be worked out for the published ICA @.050, along with the advertised vs .050 intake durations..... and assuming the lobe is symmetrical which is a good assumption on this cam. My son has that cam in his 340 BTW.)

FWIW, I get a static CR of 9.5 and DCR of 7.8, for stock deck height, stock open J heads, and .039" head gasket. DCR drops to 7.6 with a standard Felpro it head gasket (8553PT).