[BradZZ]

I intend to put a 400 from a 67 Bonnie into a 86 2+2
will the log (cast iron) exhaust manifolds of the bonnie work in a g-body
A-body log exhaust will work fine in a G-body
I've heard you could Not install a-body log exhausts in a b-body
but is the reverse true?

[BruceWilkie]

Looking at my 84GP the passenger side shouldnt matter. If center outlet on driver side maybe interfere with steering column, though I dont think it will. If rear out let I see no issue (the 305 Chevy pos in mine has rear outlet on driver side). Neither style is hard to come by. You can get headers from Indian Adventures fwiw.

[BradZZ]

Thanks for the reply
I will probably go the trial an errer method
was hoping someone had done this before

The issue I have with the G-body and its exhaust is the trans brace
with its only hump on the pass side

since the old 67 bonnie had a good Y-pipe
I'd consider reusing it if I can get away with it.

Brad in Louisville Ky

[BruceWilkie]

Summit has the double hump crossmembers for just about any tranny you want to put in your G body!

[CraigGT37]

I had a 79 Buick Regal that I put a 400 from a 70 G/P into, the exhaust manifolds from the a-body are what I used.I also used the headpipes from a 70 a-body for true duel exhaust.I mocked up the driverside pipe and marked the trans crossmember ,then took the pipe to a muffler shop to have an offset put in the pipe.
Craig

[shotgun]

Cheapy 3 tube headers work also.

[BruceWilkie]

Seems the 3 tubes fit everything doesnt it? possible early Firebird headers MIGHT fit but that control arm bracket on the frame might be an obstacle.