I didnt have that problem, but mine was building too much pressure in the crank case and blowing out my valley pan seal when running a header evac system. Took the hoses off the breathers and the problem went away. Didnt make any difference in my et.
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70 Formula
Old engine:
467 HO headed
6.79 1/8th mile @ 101.87 no N20. 1.44 60ft
6.23 1/8th @ 111.83 w/nitrous
1.37 60ft
New Engine
IAII 535
Calvin Hill Eheads
Few test passes made. Tore it up. Just got it fixed.
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