69 exhaust manifold on 68 400 - Pontiac GTO Forum
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post #1 of 6 (permalink) Old 05-31-2018, 08:14 AM Thread Starter
 
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69 exhaust manifold on 68 400

Good morning All, I have run into a little problem, while dismantling my 68-400 engine and checking dates and numbers I discovered my left side exhaust manifold was from a 69 (9782810-a) date code J029.

Will this exhaust manifold restrict flow on my 68? I have noticed the ports on the 1 and 5 cylinders is fairly small and round compared to the head. the head matches the engine and the car.

Does nay one know where I might be able to purchase a correct 68 manifold.
Hope the water is nice where you are today.
Enjoy
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post #2 of 6 (permalink) Old 05-31-2018, 10:27 AM
 
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whats the date on your other manifold ,,,, so we can check our stashes
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post #3 of 6 (permalink) Old 05-31-2018, 11:00 AM Thread Starter
 
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Originally Posted by BLK69JUDGE View Post
whats the date on your other manifold ,,,, so we can check our stashes
the Date stamp L277 (Dec 27 67). the engine date is A128 (Jan 12 68) so I believe the right on is original.
Thanks for looking.
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post #4 of 6 (permalink) Old 05-31-2018, 05:53 PM
 
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Wallace has the casting numbers. Your left appears to be a 1969 GTO, so most likely the same as the '68 ports. Pontiac Exhaust Manifolds - Wallace Racing

Measure the outlet size to see if they are the same. The end ports are round. Check out this gasket - https://www.carid.com/1968-pontiac-g...231314819.html

Here is a picture of the correct 1968 GTO - left side: https://www.partrequest.com/auto-par...-391887962509#

For performance, unless you gotta have original, upgrade to the better Ram Air manifolds.
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post #5 of 6 (permalink) Old 05-31-2018, 08:39 PM Thread Starter
 
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Thanks Jim , The manifold is the only part of the engine which does not match, will run with it until I find the correct one.
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post #6 of 6 (permalink) Old 06-12-2018, 11:17 AM Thread Starter
 
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Originally Posted by BLK69JUDGE View Post
whats the date on your other manifold ,,,, so we can check our stashes
Just checking to see if you found a exhaust manifold for December 1967.
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