headers

November 4th, 2004, 01:29 PM

i have a 72 cutlass supreme that i just put a 455 into and i was told that headers will not fit could you tell me what prevents them from fitting.any help would be appreciated. thx

jdorour · November 4th, 2004, 08:59 PM

You should be able to get a set of headers that fit.
For some reason suppliers have gotten the idea that the Cutlass Supreme has the engine offset or something like that. It is not true a big block Cutlass is the same as a 442 or a Cutlass S or an F85. The engine mounts are the same, the trans cross member is the same and the pinion angle is the same. If the engine was offset the OAI Hood would not fit a Supreme.

When you buy your headers make sure the flanges are nice and thick. Thin flanges will leak - Oldsmobile's manifold bolt pattern requires a lot of rigidity to obtain adequate clamping forces on the gasket.

Chuck C · November 11th, 2004, 10:09 PM

I have headman headers on my 70 sx and have had no problems. They did have to be "massaged" a bit and the starter wiring had to be moved but nothing major.

November 4th, 2004, 08:59 PM	#2 (permalink)
jdorour Senior Member Join Date: Feb 2004 Location: Atlanta, GA. Posts: 122	You should be able to get a set of headers that fit. For some reason suppliers have gotten the idea that the Cutlass Supreme has the engine offset or something like that. It is not true a big block Cutlass is the same as a 442 or a Cutlass S or an F85. The engine mounts are the same, the trans cross member is the same and the pinion angle is the same. If the engine was offset the OAI Hood would not fit a Supreme. When you buy your headers make sure the flanges are nice and thick. Thin flanges will leak - Oldsmobile's manifold bolt pattern requires a lot of rigidity to obtain adequate clamping forces on the gasket. __________________ 1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi. 1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels 1989 IROC-Z - 5.7TPI

November 11th, 2004, 10:09 PM	#3 (permalink)
Chuck C Junior Member Join Date: Mar 2004 Location: Oak Lawn, Il (Chgo suburb) Posts: 21	I have headman headers on my 70 sx and have had no problems. They did have to be "massaged" a bit and the starter wiring had to be moved but nothing major. __________________ 1970~Cutlass~SX W-32

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November 4th, 2004, 01:29 PM	#1 (permalink)
<72> Guest Posts: n/a	i have a 72 cutlass supreme that i just put a 455 into and i was told that headers will not fit could you tell me what prevents them from fitting.any help would be appreciated. thx