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In a .12 or .15 small block engine use 20%
BK Racing Fuel
with a head clearance of .018
In a .15 big block engine use
30% BK Racing Fuel
with a head clearance of .020
In a .21 engine use 30%
BK Racing Fuel
with a head clearance of .020
Racers only! - In a .21
engine use 40% BK Racing
Fuel with a head
clearance of .024
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