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12-05-2012, 10:53 PM
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Member
Join Date: Jul 2006
Location: san dimas , calif
Posts: 128
Likes: 0
Liked 5 Times in 3 Posts
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427-425hp w/GM 401 heads
what is the clarification as to what exhaust valve diameter is legal in the GM performance 401 replacement head, the head comes as a 1.88 diameter is this the legal valve size we can use in the 427-425hp engine, or do we have to use either the 1.84 or 1.72 valves? whats the answer?
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