418 Ls3 cranks slow

[Zachalanche]

My 418 stroker cranks slow. It always has, it cranks even slower when at operating temp. Slow enough that im surprised it starts at all.

My battery tests good

I replaced the starter because i was suspicious that i had over worked the first one years ago, but no change.

Battery voltage drops to 9.5 while cranking cold, and 8.5 when cranking hot, so there seems to be a massive load here if the battery is good.

I measured voltage at the battery and at the starter while cranking, and the voltage drop is not more than 0.1V. There was a bit of variation over a few tests, so i could get am exact voltage drop, but it doesn't appear to be significant.

So whats left to check?



Timing? What should it be at while cranking?

Do LS engines need starter shims?

Anything else? What am i missing here?

Thanks in advance.