401 timing recommendation with KB354 pistons

[kaelen]

Hmm, searching through the forum it seems that 36-38 degrees is what people are saying to run for timing.

The instructions with my Keith Black KB354 hypereutectic pistons say to run 2 - 4 deg less timing.

Currently I'm running 11 initial + 21 mechanical for 32 total by 3100 rpm.

It seems that it could use a little more, but I don't want to have detonation. :-|

My specs are.
401, .040 over
XE256 cam
RPM Air gap manifold
KB354 pistons

Any suggestions on timing for this engine combination?

[1980_Cj7]

Our engine specs are identical to yours except for the cam. I didn't see that about adjusting the timing for the KB pistons, but we ended up reducing our intial timng because it was running hot. We ended up with 5 degrees if I remember correctly, so that would fit right in with the KB recommendation to run 2 to 4 less. I think OEM is around 8, minus 2 to 4 would give 4 to 6, right where we ended up.