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When using in place of 399 74 14 it is also necessary to install 4 336733 exhaust valves 89 All Blazer 350 exc L P Gas 3958605 2 w studs |
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336733 336742 336743 NOTE 1 2nd design w increased valve stem dia use w 2nd design heads or lst design heads by V reaming all guides to accept the oversize valve stem See Group |