Fitting Dual Exhaust to my 1966 330
#1
Fitting Dual Exhaust to my 1966 330
I have a 1966 cutlass convertible with a 330 in it (single exhaust, with a cross over pipe).
A local guy is selling a '1967 stock, dual exhaust pipes', claiming it will fit any big block.
This is a picture of what he's selling - the question is: can I bolt this up to my 330 exhaust manifolds?
Does anyone know if that set up can be used on my 330? I have never been able to find exhaust manifolds for the 330 that weren't designed to come together into a single exhaust.
A local guy is selling a '1967 stock, dual exhaust pipes', claiming it will fit any big block.
This is a picture of what he's selling - the question is: can I bolt this up to my 330 exhaust manifolds?
Does anyone know if that set up can be used on my 330? I have never been able to find exhaust manifolds for the 330 that weren't designed to come together into a single exhaust.
#2
#3
You can make or buy a cap. You may have to shorten and/or mod the down pipes as your engine is an SBO and the exhaust is for a BBO, there is a difference in height between the 2.
Thortons makes an aftermarket dual exhaust manifold for your car.
http://thorntonmusclecars.com/produc...aust-manifolds
Thortons makes an aftermarket dual exhaust manifold for your car.
http://thorntonmusclecars.com/produc...aust-manifolds
#4
First, your 330 isn't a "big block". This means that the exhaust ports are lower relative to the frame than they are for a BBO. Those pipes may or may not bolt up without modification. It depends on which BBO manifolds it was designed to fit. The "fits any big block" likely REALLY means that they fit any big block with W/Z manifolds, which was NOT all of them. Sellers are notoriously mis-informed (as are many aftermarket parts vendors...).
Also. since those pipes are almost certainly designed for a 1968-72 A-body 2dr with the 112" wheelbase, they will be 3" too short for your 66 with a 115" wheelbase.
Also. since those pipes are almost certainly designed for a 1968-72 A-body 2dr with the 112" wheelbase, they will be 3" too short for your 66 with a 115" wheelbase.
#5
I believe the pipes are 2 1/4 inch for the BB and the SB 330 2 inch pipes. The flanges may not work on these pipes due to larger diameter. The block off caps they sell are for a SB though and wont fit the BB Olds exhaust manifold.
#6
I guess the simple answer then is they can be made to fit. If they came out of a 67, they will fit your '66 and be a very close fit but they probably won't be a direct bolt-in fit. You would have to cut them anyway to get them in without pulling the rear end so you can shorten or extend them as needed. The next question is how much trouble would it be to connect them to your manifolds. As tempting as those are, you may be time and money ahead to get a new, bolt-in exhaust from Summit or some other aftermarket seller.
Last edited by cjsdad; October 27th, 2018 at 07:49 AM.
#7
Cowboyhedlund
67 SBO's came with single exhaust, all piping was 2"
EXCEPT Dual exhaust was available with the 4 barrel high compression engines.
For these dual exhaust applications, the main exhaust piping was 2.25" and the tail piping was 2"
Hope that helps.
~J
EXCEPT Dual exhaust was available with the 4 barrel high compression engines.
For these dual exhaust applications, the main exhaust piping was 2.25" and the tail piping was 2"
Hope that helps.
~J
#8
You might consider taking your passenger's side manifold to a local welding shop to have the crossover port welded permanently closed. A cap may eventually leak. Also, I suggest taking your car to a local exhaust shop to have them price a set of duals for you. You would be ahead of the game vs. buying a set of pipes that won't fit and need modification. Plus, a local craftsman is bound to offer some sort of warranty on their work.
#9
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