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RE: Stock Exhaust Manifolds for 390 By Dave Shoe - 07/24/2001 7:41:47 PM; IP 12.2.11.131 1965-earlier heads don't have the extra bosses cast in to allow the extra exhaust manifold holes. All 1966-later heads DO have the extra bosses, but there are complicating issues with these later heads, too. 1966 was the first big year for emissions control in the FE. All the heads were updated. Most got redesigned runners. This makes compatibility with Hookres dicey, if you don't know what to look for. You might try searching for "C6AE-R" in this forum, in the hopes of finding one of the many posts which discusses the complicating factors Also, do NOT install 390 unibody exhaust manifolds (most C60E or C70E exh manifolds) on your unibody car. They are horrible breathers and are not compatible with certain types of FE exhaust runners (they will leak). C80E is a much better exhaust manifold to start with. Shoe.

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Skip Navigation Links.  Stock Exhaust Manifolds for 390 -- Scott Perry, 07/23/2001 RE: Stock Exhaust Manifolds for 390 -- Dave Shoe, 07/24/2001  RE: Stock Exhaust Manifolds for 390 -- Scott Perry, 07/25/2001  Scott, patience and good karma......[n/m] -- HighSpeed, 07/25/2001  RE: Stock Exhaust Manifolds for 390 -- Brian Crisman, 07/26/2001

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