427 head questions... - The Supercar Registry

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427 head questions...

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01-18-2001, 12:18 AM

COPO

Yenko Contributing Member

Join Date: Mar 2000

Location: Atlanta, GA & the Middle East

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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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