headers for 68 cutlass S 455 conv

68conv455 · October 30th, 2007, 06:41 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 · October 31st, 2007, 05:52 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 · November 19th, 2007, 08:00 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 · November 19th, 2007, 10:39 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 · November 20th, 2007, 06:04 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.

October 30th, 2007, 06:41 PM	#1 (permalink)
68conv455 Registered User Join Date: Oct 2007 Posts: 260	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.

October 31st, 2007, 05:52 AM	#2 (permalink)
Oldsguy Hot Rodder at heart Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 5,360	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 '77 Cutlass Supreme '46 2 door "The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.

November 19th, 2007, 08:00 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

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
71 Cutlass supreme conv. 455 4bbl.	scrappie	Cars For Sale	4	December 29th, 2007 05:52 AM
Cutlass Supreme headers?	GoldOlds	Small Blocks	5	August 22nd, 2007 09:06 AM
Headers etc for 71 Cutlass S	yellow 71	Cutlass	2	March 5th, 2007 08:08 PM
What Headers on 77 Cutlass 455?	curvewrecker	Cutlass	1	January 21st, 2007 08:18 PM
Headers for 455 Omega?	tomm455	Other Oldsmobiles	5	November 3rd, 2006 09:39 PM

November 20th, 2007, 06:04 PM	#5 (permalink)
68conv455 Registered User Join Date: Oct 2007 Posts: 260	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.