#1  
Old 04-29-2022, 03:49 PM
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60sstuff 60sstuff is offline
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Default RH Exhaust Manifold 65-66 GTO

There was a design change made on the RH (passenger side) exhaust manifold in ‘66.
The ‘65 RH manifold had a round casting at each end, whereas the 1966 had a revised, stronger casting at each end.

1) 1964 RH exhaust manifold.
2) 1965 RH exhaust manifold.
3) Factory photo of a 1965 GTO engine.
4) RH manifold on Scott Tiemann’s ‘65 show winner (Pontiac build).
5) Same showing the round front casting on the ‘65 manifold.

My 11A Baltimore build ‘65 Survivor also has this round casting.
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1) 65 GTO Survivor. 43,440 Original Miles. “Factory” Mayfair Maize Paint with Black Pinstripe, Black Cordova Top, Black Interior, OEM Numbers Matching Powertrain. Purchased from the Lady that bought it new. Baltimore Built (11A).
2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 04-29-2022, 03:59 PM
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Default 1966 RH Exhaust manifold

Photos showing the revised, stronger manifold casting at each end on a ‘66.

1) New 1966 GTO engine with the revised manifold.
2) My 01B Fremont built Survivor RH manifold.
3) Front of the ‘66 manifold showing the stronger/heavier casting.
4) Rear of the ‘66 RH manifold.
5) The 1967 also used this revised casting on the RH manifold.
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1) 65 GTO Survivor. 43,440 Original Miles. “Factory” Mayfair Maize Paint with Black Pinstripe, Black Cordova Top, Black Interior, OEM Numbers Matching Powertrain. Purchased from the Lady that bought it new. Baltimore Built (11A).
2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 04-30-2022, 08:40 PM
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Gary H Gary H is offline
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Default

Great info! Didn't know this. Thanks for sharing

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Old 04-30-2022, 09:35 PM
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My '65 was a late build, mid July 1965, and it has that '66 revised stronger design right manifold. I'll take some photos of it this week and post.

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Old 04-30-2022, 09:58 PM
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The round earlier castings are more elegant.

That is if an exhaust manifold can be considered elegant.

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Old 01-09-2023, 02:07 PM
jsswansonjr jsswansonjr is offline
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My 65 GTO was a late May 1965 build and it has the 66 revised stronger design right manifold.

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