{The 14096217 SBC head casting) Working on a set of 14096217's that came from a 5.7 Mercruiser, They are 1.94" / 1.50" valve head with 64cc chambers and no swirlport vanes. Some interesting points to note, these heads have hard steel exhaust seat inserts ! the exhaust v/v's are 0.372 (3/8") oversize stem, These are for HD use.