Intake swap, headers, and ??
September 20th, 2013 | 02:02 PM
#1
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Joined: Sep 2013
Posts: 28
From: Shakopee, MN
Intake swap, headers, and ??
So I have this addiction.....:-) I have this 455 from I think 1972 in my 65 Dynamic and I just cant leave it alone. I have a new Edelbrock carb on it and I want/need to put a new intake on. I have found an Offenhauser for holly style carbs for just shy of $120. Is that a good price? Also I have been reading about block off plates and gaskets and valley pans and I want to make sure I do this right and add performance to the car not detract from it. Also I want good stuff. Which I understand has a lot of opinion built into it, however, is this a good manifold for a stock motor upgrade? What headaches will arise if any? What first timer mistake do I need to avoid?
Also looking into headers. B bodied car and there seems to be little to no room for headers. are there any?
Also looking into headers. B bodied car and there seems to be little to no room for headers. are there any?
Last edited by mphyle0927; September 20th, 2013 at 02:04 PM.
September 20th, 2013 | 02:18 PM
#2
Registered User
Joined: Aug 2009
Posts: 333
B-body cars from this time frame have no good header options. Dual exhaust means using stock dual exhaust manifolds, or reproductions from Thorntons.
As far as the Offy, which manifold is it? Single-plane or dual-plane? You'll likely want to stick with dual-plane, and frankly the Edelbrock Performer is probably the better bet for an engine that is stock.
As far as the Offy, which manifold is it? Single-plane or dual-plane? You'll likely want to stick with dual-plane, and frankly the Edelbrock Performer is probably the better bet for an engine that is stock.
September 20th, 2013 | 05:20 PM
#3
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Joined: Jul 2007
Posts: 16,569
From: Edmond, OK
Erinyes is correct. There are no headers available for you vehicle. The Edelbrock Performer is a popular manifold for BBO; however, Offenhauser makes good manifolds too.
My father (Oldsguy) had an Offenhauser O4B intake on his 69 Delta 88. He bought it from a friend for $50 since it had a stud broken off in it. After an afternoon taking the stud out it worked great. The only problem with the older Offenhauser intakes is that you can't run HEI ignition with some of them. I know the O4B doesn't allow you to run HEI.
My father (Oldsguy) had an Offenhauser O4B intake on his 69 Delta 88. He bought it from a friend for $50 since it had a stud broken off in it. After an afternoon taking the stud out it worked great. The only problem with the older Offenhauser intakes is that you can't run HEI ignition with some of them. I know the O4B doesn't allow you to run HEI.
September 21st, 2013 | 07:49 AM
#6
Old(s) Fart
Joined: Mar 2007
Posts: 48,377
From: Northern VA
The 1965-70 full size cars are rear steer, meaning that the steering linkage is behind the crossmember. Given the limited market for these cars and the difficulty in fitting headers, no one makes any. Your best bet would be to start with headers for a 1973-74 Olds Omega (also rear steer) and cut and weld to fit.
September 21st, 2013 | 08:57 AM
#7
Lt. Buzzkill (ret.)
Joined: Mar 2004
Posts: 1,297
From: Western New York
O4B is an Edelbrock intake, just FYI.
As for the exhaust, I personally don't think headers are worth the expense/effort in this chassis. I'd recommend the factory dual manifolds and a good 2 1/2" exhaust system.
As for the exhaust, I personally don't think headers are worth the expense/effort in this chassis. I'd recommend the factory dual manifolds and a good 2 1/2" exhaust system.
Last edited by copper128; September 21st, 2013 at 08:59 AM.
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