Gold Lifetime Member
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Re: intake manifold vacuum leak?
You are thinking correctly on the helicoils. place rags in lifter valley to catch all shavings, use vacumn cleaner if necessary.
Try using thicker intake gaskets, pre fit the gasket to the head and intake to check alignment. Use sealer on water passages, maybe smear on the head side gasket only?
I use RTV on the manifold ends to block, no gaskets. Allow rtv to cure and get a better fit.
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968
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