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I'm going to convert the mount to a more correct one for my '66 so that the manifolds you show will fit. Question is: I need 2". Do you know if these Dormans you provided a picture of are 2"
Thanks a lot for taking the time to help me with this... I'm learning slowly but surely.
Last edited by Tigershark3; 02-24-2017 at 01:25 PM.
I'm going to convert the mount to a more correct one for my '66 so that the manifolds you show will fit. Question is: I need 2". Do you know if these Dormans you provided a picture of are 2"
Thanks a lot for taking the time to help me with this... I'm learning slowly but surely.
Looks like the ones I showed are 2 1/2". Best thing for you to do is go to an auto parts store and look in their books for the configuration you want, get a Dorman number and then go shopping.
1966 coupe... The exhaust manifolds are in pretty bad shape. One of my winter projects is to replace these with new. As near as I can tell the casting numbers are 3747038 and 3749965. Anyone have good luck with new imported castings? Most of the used ones I see on eBay are in pretty bad shape.
Thanks in advance
Greg
If you replace yours KEEP your old ones. Mine weren't the in the best shape by far and they restored beautifully. If you don't want them someone else might need and really appreciate having them.
Is your alternator mounted onto the right side 3747038 manifold? If so then the wiring harness was modified to mount the alt on the right side (normal 1966 alt mount is on the left side).
If that is the case, then you need a 1964-65 style upper mount bracket. There is also a steel piece that mounts between the right side manifold and the alternator for the right side mount.
With the part numbers that you have, the alternator should be mounted on the right side.
If you want to mount the alternator on the correct, left side, then you should buy the proper manifolds for a 1966 Corvette small block, the previously posted brackets, and you will have to modify your engine harness back to an original 1966 configuration.
Last edited by 65tripleblack; 02-24-2017 at 03:09 PM.
Is your alternator mounted onto the right side 3747038 manifold? If so then the wiring harness was modified to mount the alt on the right side (normal 1966 alt mount is on the left side).
If that is the case, then you need a 1964-65 style upper mount bracket. There is also a steel piece that mounts between the right side manifold and the alternator for the right side mount.
With the part numbers that you have, the alternator should be mounted on the right side.
If you want to mount the alternator on the correct, left side, then you should buy the proper manifolds for a 1966 Corvette small block, the previously posted brackets, and you will have to modify your engine harness back to an original 1966 configuration.
To add to Tripleblack's comment, there are at least two styles (maybe more) of C2 exhaust manifolds with provisions for an alternator mount.
For 1966-67, the alternator is mounted on the driver side and the exhaust manifold mounting provision has two threaded holes that run parallel to the crankshaft. The basic appearance is like the repro unit in the photo below. This manifold is different from the earlier versions that mounted the alternator on the passenger side.
I have all the correct casting numbers on file but I'm away from home right now. Let me know if you want me to look them up when I get home on Sunday.
To add to Tripleblack's comment, there are at least two styles (maybe more) of C2 exhaust manifolds with provisions for an alternator mount.
For 1966-67, the alternator is mounted on the driver side and the exhaust manifold mounting provision has two threaded holes that run parallel to the crankshaft. The basic appearance is like the repro unit in the photo below. This manifold is different from the earlier versions that mounted the alternator on the passenger side.
I have all the correct casting numbers on file but I'm away from home right now. Let me know if you want me to look them up when I get home on Sunday.
He has a hodgepodge. An 350 engine from a later model year, and exhaust manifolds from prior to 1964. He has a 1966 car.
It's not clear from his posts whether it's mounted on the right or left side; however, I have to assume that it's mounted to the right side since his manifolds are pre 1966. His casting numbers were enumerated in an early post.
Whatever manifolds he decides to get, he has to buy 2" manifolds because his exhaust head pipes are 2"................ironically, and I suppose, luckily "correct" for his 1966 small block, although I don't get the impression that the OP cares about that.
Another item that comes into play, is whether or not the engine installer used a 1966 engine harness, or some other. If the 1966 harness was used, then it had to be modified to accept a right hand alternator mount.
The OP is giving vitals in "drips and drabs". From what I have been able to sleuth together based on the very sketchy information, is that his alternator is mounted on the right (OP: that means "passenger" side) and whatever engine harness is being used was cobbled to make it fit in his 1966 model, unless he used a 1964-65 engine harness.
If the previous paragraph is true, then the OP would be wise to buy the proper Dorman replacements for a 1965 327/250-300 (2"). This would permit him to use his current alternator brackets, as well as his current wiring harness and head pipes.
Last edited by 65tripleblack; 02-24-2017 at 05:44 PM.
He has a hodgepodge. An 350 engine from a later model year, and exhaust manifolds from prior to 1964. He has a 1966 car.
It's not clear from his posts whether it's mounted on the right or left side; however, I have to assume that it's mounted to the right side since his manifolds are pre 1966. His casting numbers were enumerated in an early post.
Whatever manifolds he decides to get, he has to buy 2" manifolds because his exhaust head pipes are 2"................ironically, and I suppose, luckily "correct" for his 1966 small block, although I don't get the impression that the OP cares about that.
Another item that comes into play, is whether or not the engine installer used a 1966 engine harness, or some other. If the 1966 harness was used, then it had to be modified to accept a right hand alternator mount.
The OP is giving vitals in "drips and drabs". From what I have been able to sleuth together based on the very sketchy information, is that his alternator is mounted on the right (OP: that means "passenger" side) and whatever engine harness is being used was cobbled to make it fit in his 1966 model, unless he used a 1964-65 engine harness.
If the previous paragraph is true, then the OP would be wise to buy the proper Dorman replacements for a 1965 327/250-300 (2"). This would permit him to use his current alternator brackets, as well as his current wiring harness and head pipes.
It is a hodgepodge that I'm trying to correct. The alternator is mounted on the driver's side with early manifolds with the 350 replacement engine. Dorman has these manifolds that are 2" (I called them to verify) and I believe are correct for a '66 (674-500 and 674-501). I'll need to get another alternator mounting kit to go with the new manifolds but that's ok
It is a hodgepodge that I'm trying to correct. The alternator is mounted on the driver's side with early manifolds with the 350 replacement engine. Dorman has these manifolds that are 2" (I called them to verify) and I believe are correct for a '66 (674-500 and 674-501). I'll need to get another alternator mounting kit to go with the new manifolds but that's ok
Appreciate all the comments...
Greg, if Air Conditioning is in the future with this car, you might consider leaving the alternator where it is. The compressor is typically located to the passenger side.
Some of the new aftermarket A/C systems are terribly efficient and not too difficult to install.
It is a hodgepodge that I'm trying to correct. The alternator is mounted on the driver's side with early manifolds with the 350 replacement engine. Dorman has these manifolds that are 2" (I called them to verify) and I believe are correct for a '66 (674-500 and 674-501). I'll need to get another alternator mounting kit to go with the new manifolds but that's ok
Appreciate all the comments...
I can't tell if you looked at post #21 but Amazon has them for $53 and change. That's probably as cheap as they get.
02-24-2017, 01:15 PM
