01-08-2014, 12:57 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
The base of the outer shell looks ok on 7 & 8.
6 looks like low compression, weak valve spring, or small internal oil leak (guide, inlet manifold).
How many miles on these plugs?
What model Holley do you have?
I think you also need a better carburettor, like a QFT.
__________________
Gary
Gold Certified Holden Technician
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