Exhaust Manifold Question - 1965 L76

[Michael M.]

I have a 1965 365hp (June 65' build, No Air) with incorrect Exhaust Manifolds. After doing some research I found that I need the following casting numbers.

Left: 3846563 Right: 3797902 (with choke tube)

Questions:
1. Can you please confirm that this is what I need to be correct?
2. Will Reproduction manifolds make the car loose points in judging?
3. Where can I purchase originals?

Thanks.

[Don H.]

Re: Exhaust Manifold Question - 1965 L76

Michael
welcome to the technical discussion forum.
Your numbers are right as listed in the table of Exh manifold numbers on page 153 of the new 1965 TIM&JG.
Yes, reproductions will usually lose a couple Originality points for configuration, and date.
And you can find originals by placing an ad in the NCRS Classified Ads forum, searching used parts sellers in the Driveline, (David Sokolowski in So CAL is a good one), searching Corvette parts swap meets, and online used parts sellers.
Good luck

[John D.]

Re: Exhaust Manifold Question - 1965 L76

Michael, One word of caution in your search for correct manifolds. I have had a set of NOSR manifolds since the late 70's. But they are not worth a crap as the two halves of the manifold have a seam that has horrible grinding marks going from side to side. Hard to explain. Where the top of the exhaust manifolds should have nibs-mine have course grinding marks. You see these parts on Ebay going for less than $300 a pair as that's all they are worth. Not trying to sell mine as they are only good for nice boat anchor.

At the fleas yours are not terribly h ard to find compared to the FI manifolds. John

[Michael M.]

Re: Exhaust Manifold Question - 1965 L76

Thanks guys. I read that I need a 3797902 "Version 3" for the Right side. Is there a way to tell?

Also, how many points would I loose if I went with Re-Pops?

[Gary B.]

Re: Exhaust Manifold Question - 1965 L76

Micheal,

Here's another source who should be able to help you out: http://www.engineslimited.com/index.html
The owner is Randy.

Gary

[Michael M.]

Re: Exhaust Manifold Question - 1965 L76

Micheal,

Here's another source who should be able to help you out: http://www.engineslimited.com/index.html
The owner is Randy.

Gary

I spoke to Randy already and he has them, but I requested pictures and he is having trouble with his e-mail. When I get the pictures, can I post them here and get your feedback?

[Michael M.]

Re: Exhaust Manifold Question - 1965 L76


This is what I was sent.

Would these work? Also, any recommendations on getting the color to match that from the factory? Beadblast? Paint? Powercoat?

[Joe R.]

Re: Exhaust Manifold Question - 1965 L76

This is what I was sent.

Would these work? Also, any recommendations on getting the color to match that from the factory? Beadblast? Paint? Powercoat?

Michael,

One way to get a nice finish that will last is to send them to Jerry MacNeish. Here's his web site:

http://z28camaro.com/wp/restoration-services/

He coats the outside with aluminum and supplies you with cast blast paint to finish the job. They will never rust on the outside after that. I like the way they look. John Hinckley posted pictures of his exhaust manifolds on his Camaro that have been on there a good while. They still look good.

Joe

[Michael M.]

Re: Exhaust Manifold Question - 1965 L76

Michael,

One way to get a nice finish that will last is to send them to Jerry MacNeish. Here's his web site:

http://z28camaro.com/wp/restoration-services/

He coats the outside with aluminum and supplies you with cast blast paint to finish the job. They will never rust on the outside after that. I like the way they look. John Hinckley posted pictures of his exhaust manifolds on his Camaro that have been on there a good while. They still look good.

Joe

Great. Thanks for the info. Will the ones that I posted be correct for a 65' 365hp? (No air, June 65 build)

[Joe C.]

Re: Exhaust Manifold Question - 1965 L76

Great. Thanks for the info. Will the ones that I posted be correct for a 65' 365hp? (No air, June 65 build)

Yes..........

[Joe L.]

Re: Exhaust Manifold Question - 1965 L76

Great. Thanks for the info. Will the ones that I posted be correct for a 65' 365hp? (No air, June 65 build)

Michael-------


One thing to keep in mind: to get exactly original configuration in every nuance of detail one needs to obtain original manifolds (or, VERY old SERVICE pieces). However, the vast majority of these will be USED. When exhaust manifolds are subjected to "umpteen" heating and cooling cycles, there is an effect on the metallurgy. This makes them much more prone to cracking.

[Michael M.]

Re: Exhaust Manifold Question - 1965 L76

Michael-------


One thing to keep in mind: to get exactly original configuration in every nuance of detail one needs to obtain original manifolds (or, VERY old SERVICE pieces). However, the vast majority of these will be USED. When exhaust manifolds are subjected to "umpteen" heating and cooling cycles, there is an effect on the metallurgy. This makes them much more prone to cracking.

So, there is no way to tell how "used" the ones in this thread are right? If so, would you buy these and have them blasted\painted or go with Repops that you know have not been used?

I am new here, so I am looking for a direction of which you seasoned guys would do in my position.

[Michael M.]

Re: Exhaust Manifold Question - 1965 L76

Michael, One word of caution in your search for correct manifolds. I have had a set of NOSR manifolds since the late 70's. But they are not worth a crap as the two halves of the manifold have a seam that has horrible grinding marks going from side to side. Hard to explain. Where the top of the exhaust manifolds should have nibs-mine have course grinding marks. You see these parts on Ebay going for less than $300 a pair as that's all they are worth. Not trying to sell mine as they are only good for nice boat anchor.

At the fleas yours are not terribly h ard to find compared to the FI manifolds. John

Are these the grinding marks that you are referring to? This pic is one of the RH manifolds that I am considering on buying. Your thoughts?

[Mike M.]

Re: Exhaust Manifold Question - 1965 L76

u don't want the manifolds with the pictured grind marks. they are late service replacement or recent repos. u want the ones with the Nubs or elevations are pictured elsewhere in this post. mike

[Joe C.]

Re: Exhaust Manifold Question - 1965 L76

Are these the grinding marks that you are referring to? This pic is one of the RH manifolds that I am considering on buying. Your thoughts?

I am finished with you. Both here and on the other forum. I have given you good advice, yet you have not responded to me, at all. Not even the courtesy of a thank you.
Hope you find your snipe at the hunt.
One last bit of advice: buy a used set and continue to drive your car. You'll thank me for it later. Bye Bye.
BTW: my original NCRS number was 905. But, then again, I know you're not into that sort of thang.