To use the stock exhaust manifold you'll have to make sure your middle runners will clear the heat cross over, as well as the plate you'll use to seal it up. That was an issue I ran into with my "sheet metal" intake and you can see where I cut the cross over out and welded block off plates where needed. You'll need to find a way to locate (dowel?) the exhaust manifold to the ports. I struggled with a #6 exhaust leak because port alignment.
I would use 2" pipe from the exhaust manifold. This is 2.5" pipe and I had to trim a tab off the motor mount to clear. I think it's too large of a primary pipe for the engine. Though you likely have the ability to be more creative with the piping than I! I used two 1.75" pipes on my turbo header.
https://www.youtube.com/watch?v=6_eAOO-iBAA
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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; 02-15-2019 at 06:35 PM.
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