Exhaust manifolds off G 455 heads
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Exhaust manifolds front drum spindles LH/RH added more parts
I got em you need em $40+shipping. Pick up locally Rosehill Kansas. Added front drum spindle assembly LH/RH $50 each.
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Last edited by wr1970; Jun 23, 2021 at 03:39 PM.
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Joined: Mar 2007
Posts: 50,857
From: Northern VA
Actually, not entirely. 411961 was primarily a small block manifold, but Olds did use it on 1975-76 455s with single exhaust. There's a reason why the 455 in those years was rated at a whopping 190 HP. 
398704 was used on 1968-73 350 motors only, however. In neither case did the factory ever bolt them to G heads. I'm guessing that G-headed 455 was an engine swap and whoever did the swap reused the 350 manifolds.
398704 was used on 1968-73 350 motors only, however. In neither case did the factory ever bolt them to G heads. I'm guessing that G-headed 455 was an engine swap and whoever did the swap reused the 350 manifolds.
Thread Starter
Registered User
Joined: Sep 2013
Posts: 3,645
Actually, not entirely. 411961 was primarily a small block manifold, but Olds did use it on 1975-76 455s with single exhaust. There's a reason why the 455 in those years was rated at a whopping 190 HP.
398704 was used on 1968-73 350 motors only, however. In neither case did the factory ever bolt them to G heads. I'm guessing that G-headed 455 was an engine swap and whoever did the swap reused the 350 manifolds.
398704 was used on 1968-73 350 motors only, however. In neither case did the factory ever bolt them to G heads. I'm guessing that G-headed 455 was an engine swap and whoever did the swap reused the 350 manifolds.
Last edited by wr1970; Jun 23, 2021 at 06:33 AM.
Old(s) Fart
Joined: Mar 2007
Posts: 50,857
From: Northern VA
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