After a bunch of research on it, I came to the conclusion it probably isn't worth filling the exhaust manifold to separate it. It takes a few quarts of fairly expensive ceramic filler, or you could use aluminum if you have a good source of aluminum stock and can pour it. For what it takes, look for some headers. The exhaust flapper can either be wire tied open or I removed it and tapped the rod holes and put bolts in them.
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
Last edited by TheSilverBuick; 02-23-2017 at 11:42 AM.
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