05-15-2010, 01:07 PM

bluzurb

Senior Member

Join Date: Mar 2010

Location: Norfolk, VA

Posts: 112

another question. i was just comparing valve sizes of the 455 heads to the heads i have now. the 455 15 code heads have 1.96/1.66 vlaves. also 87cc. the 6x heads have 2.11/1.66 and 7.6 cr. Can someone please break this down for me. How much better are the 455 heads than the 400 heads?

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