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[C2] side pipe question

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Old Apr 22, 2022 | 08:43 PM
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Default side pipe question

Hi,
I'm looking at a 65 roadster 300hp automatic that has side pipes on it. They show a window sticker with the side pipes listed as an option and wanted to know if they were available on 300hp cars in 65
Thanks for any help
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Old Apr 22, 2022 | 08:51 PM
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Side pipes were available after March of 65. So when was the car built
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Old Apr 22, 2022 | 10:03 PM
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Actually also where was the body built? AOS cars did not have side pipes only St. Louis cars.
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Old Apr 23, 2022 | 01:12 AM
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Sidepipes were available on 300 HP engines with manual transmissions that had 2.5" manifolds, but 300 HP engines with PG had 2" manifolds, so I'm not sure if sidepipes were available with 300 HP/PG.

Download the '65 Corvette vehicle information package from the GM website. It should tell you if sidepipes were available with 300 HP/PG.

Let us know what you find.

Duke
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Old Apr 23, 2022 | 06:22 AM
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Originally Posted by Nowhere Man
Side pipes were available after March of 65. So when was the car built
Just looked it up says around June 24th
Could you get them with 300hp motor
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Old Apr 23, 2022 | 06:23 AM
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Originally Posted by SWCDuke
Sidepipes were available on 300 HP engines with manual transmissions that had 2.5" manifolds, but 300 HP engines with PG had 2" manifolds, so I'm not sure if sidepipes were available with 300 HP/PG.

Download the '65 Corvette vehicle information package from the GM website. It should tell you if sidepipes were available with 300 HP/PG.

Let us know what you find.

Duke
Thanks i will
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Old Apr 23, 2022 | 06:25 AM
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Originally Posted by pats67copo
Just looked it up says around June 24th
Could you get them with 300hp motor
AO Smith or St Louis Body? But i am thinking like Duke that a 300 and auto could not get side pipes
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Old Apr 23, 2022 | 06:27 AM
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Originally Posted by SWCDuke
Sidepipes were available on 300 HP engines with manual transmissions that had 2.5" manifolds, but 300 HP engines with PG had 2" manifolds, so I'm not sure if sidepipes were available with 300 HP/PG.

Download the '65 Corvette vehicle information package from the GM website. It should tell you if sidepipes were available with 300 HP/PG.

Let us know what you find.

Duke
Duke,
how do I get to this website so I can loo it up
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Old Apr 23, 2022 | 06:31 AM
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Gm Heritage web site
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Old Apr 23, 2022 | 06:36 AM
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Originally Posted by Nowhere Man
AO Smith or St Louis Body? But i am thinking like Duke that a 300 and auto could not get side pipes
So I'm guessing if it has side pipes the manifolds were changed or do they make two inch side pipes aftermarket
I don't have a picture of the tag to be able to tell where it was built
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Old Apr 23, 2022 | 06:42 AM
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If the car doesn’t have power windows and you have a picture of the door jam you can tell that way.
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Old Apr 23, 2022 | 08:05 AM
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Side Note: Only 759 (N14) side exhaust cars were built in 65 according to the NSRC Spec Book (23,564 total Corvettes built)

John Z Posts:

"All small-block midyears had 2-1/2" exhaust pipes except base-engine Powerglides - they had 2" pipes. From '66-up, all small-block exhaust manifolds had 2" outlets, and everything except base-engine Powerglides had the 2-1/2" exhaust pipes swaged down to 2" just below the manifold outlets."

" '66-'67 327's (except 300hp Powerglides) all had 2-1/2" exhaust systems, but the exhaust manifold outlets were all 2"; the 2-1/2" front exhaust pipes were swaged down to 2" just below the connection to the exhaust manifold. 300hp Powerglides were 2" all the way to the mufflers."

I cannot seem to find anything to confirm the Auto/Side exhaust question.... I go with Duke!

Have a good weekend!




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Old Apr 23, 2022 | 09:27 AM
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Post pic of window sticker to ensure it is original

Paul
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Old Apr 23, 2022 | 10:18 AM
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Nolan's book pages 295-296 states that for '65 N-14 was available on all optional engines with manual transmissions from L-75-up, including L-78 when it was introduced. So that says no N-14 on 300HP/PG or 250 HP engines regardless of transmission. Another way to say this is that all engines with 2.5" manifolds could be ordered with side pipes, but not the engines with 2" manifolds, 300 HP/PG and 250 HP with either manual or PG.

Duke
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Old Apr 23, 2022 | 10:43 PM
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If it’s the yellow roadster in Georgia I’m thinking of the documentation is phony, the side pipes are added.
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Old Apr 24, 2022 | 04:40 AM
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Originally Posted by dcamick
Side Note: Only 759 (N14) side exhaust cars were built in 65 according to the NSRC Spec Book (23,564 total Corvettes built)

John Z Posts:

"All small-block midyears had 2-1/2" exhaust pipes except base-engine Powerglides - they had 2" pipes. From '66-up, all small-block exhaust manifolds had 2" outlets, and everything except base-engine Powerglides had the 2-1/2" exhaust pipes swaged down to 2" just below the manifold outlets."

" '66-'67 327's (except 300hp Powerglides) all had 2-1/2" exhaust systems, but the exhaust manifold outlets were all 2"; the 2-1/2" front exhaust pipes were swaged down to 2" just below the connection to the exhaust manifold. 300hp Powerglides were 2" all the way to the mufflers."

I cannot seem to find anything to confirm the Auto/Side exhaust question.... I go with Duke!

Have a good weekend!
thanks that was very informative
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Old Apr 24, 2022 | 04:41 AM
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Originally Posted by SWCDuke
Nolan's book pages 295-296 states that for '65 N-14 was available on all optional engines with manual transmissions from L-75-up, including L-78 when it was introduced. So that says no N-14 on 300HP/PG or 250 HP engines regardless of transmission. Another way to say this is that all engines with 2.5" manifolds could be ordered with side pipes, but not the engines with 2" manifolds, 300 HP/PG and 250 HP with either manual or PG.

Duke
thanks duke
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