12-13-2011, 06:02 AM
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CC Member
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Join Date: Jun 2008
Location: Chester Springs,
PA
Cobra Make, Engine: Kirkham 289 FIA #690, FRPP 427 Boss engine
Posts: 764
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Not Ranked
The Z heads have been used on 1000's of engines. I have them on the 347 stroker in my 66 Mustang with no problem. I also have the 427w that you have in my cobra, but have not run it enough to know if I have a similar problem. My carb is running so rich right now, that I'm not going anywhere for awhile. From what you describe, I doubt the rings are upside down. It does sound more like a head issue, potentially valve seals, but if so much oil is being pumped into the heads with small drain back holes, I guess that could be the problem also.
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RCR GT40 SOLD to Fast 5
Kirkham #690 289 FIA
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