Thread: 427 head questions...
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Old 01-18-2001, 12:18 AM
COPO COPO is offline
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Default Re: 427 head questions...
The exhaust valve is larger on the #291 heads. 1.72" vs 1.88". There were a number of COPO's built after May of '69 consequently they would likely have had #291 heads. Can't help you on the part #'s.
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