headers for 68 cutlass S 455 conv

68conv455 · 10-30-2007, 05:41 PM

Please help me find headers for my 68 cutlass S conv. The manufacturers always say except S, or automatic, or convertible. I have all three. My car is a 68 cutlass S conv. with a floor shifted auto. I transplanted the original inline 6 with a 455.

I like the thorley headers but they say except convertible. Doesn't the 442 share the heavy duty frame like the conv?

If you have direct experience with a 68 conv 455, please help me find reasonable priced headers.

Thanks.

Oldsguy · 10-31-2007, 04:52 AM

Common problem is that manufacturers mis-identify this in their charts. If you search you will see quite a few posts where people have asked this before. The bottom line is headers to fit a Cutlass will fit also fit your Cutlass S convertible.

ImWired · 11-19-2007, 07:00 AM

I think the problem of getting headers to fit may be that the supreme 442's came with dual exhaust and the cross overs would have been notched for this and the others are not.
ImWired

joe_padavano · 11-19-2007, 09:39 AM

Quote:

Originally Posted by ImWired

I think the problem of getting headers to fit may be that the supreme 442's came with dual exhaust and the cross overs would have been notched for this and the others are not.
ImWired

Nope. Prior to 1975 (when federally mandated catalytic converters forced all cars to have single exhaust), ALL GM crossmembers were notched for dual exhaust. THERE IS NO "HEADER ISSUE" with Supremes or convertibles, just misinformation.

68conv455 · 11-20-2007, 05:04 PM

Thanks everyone for the info. I assumed this to be correct from my research on "442" site which Joe P. has contributed. Thanks Joe. Like many of you, I just need to be sure before I pull the trigger on the family checkbook. No room for errors.

10-30-2007, 05:41 PM	#1 (permalink)
68conv455 Senior Member Join Date: Oct 2007 Posts: 92	headers for 68 cutlass S 455 conv Please help me find headers for my 68 cutlass S conv. The manufacturers always say except S, or automatic, or convertible. I have all three. My car is a 68 cutlass S conv. with a floor shifted auto. I transplanted the original inline 6 with a 455. I like the thorley headers but they say except convertible. Doesn't the 442 share the heavy duty frame like the conv? If you have direct experience with a 68 conv 455, please help me find reasonable priced headers. Thanks.

10-31-2007, 04:52 AM	#2 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,857	Common problem is that manufacturers mis-identify this in their charts. If you search you will see quite a few posts where people have asked this before. The bottom line is headers to fit a Cutlass will fit also fit your Cutlass S convertible. __________________ Dan '46 2 door

11-19-2007, 07:00 AM	#3 (permalink)
ImWired Junior Member Join Date: Dec 2006 Posts: 12	Headers I think the problem of getting headers to fit may be that the supreme 442's came with dual exhaust and the cross overs would have been notched for this and the others are not. ImWired

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11-20-2007, 05:04 PM	#5 (permalink)
68conv455 Senior Member Join Date: Oct 2007 Posts: 92	Thanks everyone for the info. I assumed this to be correct from my research on "442" site which Joe P. has contributed. Thanks Joe. Like many of you, I just need to be sure before I pull the trigger on the family checkbook. No room for errors.