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i have a 421 sbc with a big shot plate and am wondering how much total timing you guys are using on your big tune up

i have 325 in now and was wondering if pulling 15 degrees is too much

i know every combo is diff but i wanted a ballpark figure on similar combos

oh i have a 23 degree head

thx

I run a 415 with a 23 degree head and a big shot. When I had it set at 325 it seemed to like 11.5 the best. Every motor is different though so start high and pull back after each plug reading. Till you get it right.

Sbc seem to get away with pulling less than the Sbf from what I've seen.
 
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