| Additional Information Valve, Modern style, has a 1.543" head diameter. Larger valve head diameter allows more fuel into combustion chamber giving you more power. Requires a special valve spring retainer, part #3056M and special spring retainer split keeper, part# 3057M. No need to modify head or gasket! .030 oversize stem (.340) Questions and Answers There are currently no questions for this item. To ask a question about this item please press and fill out the form. Customers Who Bought This Item Also Bought | |