Side Exhaust Pipes

[Michael M.]

Re: Side Exhaust Pipes

Hi Paul, In the "Chevrolet by the numbers" book, those two part numbers are 2 inch manifolds. 7038 is a RH manifold for the 64 250hp w/ac & 300hp engines w/AT & AC and 65 250 (early) w/ac and 300hp w/ac & AT. the 9965 was used with the 58-61 283 and 62-63 250 & 300hp engines. So you'll need to order 2 inch pipes if you keep those manifolds. The correct part numbers for your car are 3747042 RH and 3846559 LH. But what you have works also, obviously. I don't know enough about the actual castings to know if you give up any performance using what you have now, probably not. Mike

[Paul L.]

Re: Side Exhaust Pipes

Hi Paul, In the "Chevrolet by the numbers" book, those two part numbers are 2 inch manifolds. 7038 is a RH manifold for the 64 250hp w/ac & 300hp engines w/AT & AC and 65 250 (early) w/ac and 300hp w/ac & AT. the 9965 was used with the 58-61 283 and 62-63 250 & 300hp engines. So you'll need to order 2 inch pipes if you keep those manifolds. The correct part numbers for your car are 3747042 RH and 3846559 LH. But what you have works also, obviously. I don't know enough about the actual castings to know if you give up any performance using what you have now, probably not. Mike

Mike,
I really appreciate your non-condescending responses to my questions. If you read the entire thread, I expounded on some of the "odd" things that i have found on my dream car. I am convinced that it is an original side pipe car but I don't know how to prove it absolutely. Judging by the way the rest of the car was treated, I cannot imagine the previous owners going through the trouble of removing the body to remove all evidence of the brackets. I have wanted a mid year since I was in high school and I finally got it after 40 years of yearning. It may not be perfect but it is all that I had hoped it to be. While the engine is not correct, I cannot forsee spending the kind of money it would take to get it correct. It runs very strong (L79/3.70/4-speed) and I get lots of "thumbs up" and approving nods. I have received many trophys from car shows where I compete against all kinds of cars. I wouldn't fair so well in a Corvette Only show but who knows?
Thanks again for the responses.
Paul

[Michael M.]

Re: Side Exhaust Pipes

Mike, I really appreciate your non-condescending responses to my questions. If you read the entire thread, I expounded on some of the "odd" things that i have found on my dream car. I am convinced that it is an original side pipe car but I don't know how to prove it absolutely. Judging by the way the rest of the car was treated, I cannot imagine the previous owners going through the trouble of removing the body to remove all evidence of the brackets. I have wanted a mid year since I was in high school and I finally got it after 40 years of yearning. It may not be perfect but it is all that I had hoped it to be. While the engine is not correct, I cannot forsee spending the kind of money it would take to get it correct. It runs very strong (L79/3.70/4-speed) and I get lots of "thumbs up" and approving nods. I have received many trophys from car shows where I compete against all kinds of cars. I wouldn't fair so well in a Corvette Only show but who knows? Thanks again for the responses. Paul

Paul, I hope that the info was of some help. At least you won't have get under there till you're ready to replace them. I find that everyone is happy to share the technical info, which I have taken advantage of, so it's great to be able to help someone else. I just happened to be home near the reference material. Your car sounds like a beauty. You might be surprised at how it would fare at a corvette only show. It depends on who is judging and what they are judging. Flight judging is another matter. But if you need info about how to restore to factory original specs and appearance, this is the place to get it as well. I have started a thread or two regarding sidepipes and manifolds, etc.. and I got a lot of great info from different people. I got some opinions as well, which is cool. Some pushed to "do what you like" and others pushed for restoration to original condition, which is natural considering that is the purpose of the organization. As far as original sidepipes go, if you can't see the brackets or the remains then the some other clues would be the fender tabs in front and the how the rear quarter was finished at the rocker panel. Someone posted a picture of the rear quarter in this thread. Maybe someone will post a picture of the fender/rocker from an original car. Also, the splash shields in front would have no rubber seals and no holes for staples to hold them. As for your engine, if it's a 68 327, it has the larger crankshaft journals, a stronger engine maybe? Others will know better. Anyway, I hope you enjoy driving yours as much as I do mine. Mike

[Michael J.]

Re: Side Exhaust Pipes

Excellent! Another piece of the puzzle solved and in place. I would really encourage you to put it into flight judging at your local chapter meet, that is how we most all get started. They will give you a wealth of info, answer all your questions in a very non-condescending or patronizing manner (if they are judges worth their salt, which most are). These cars are great no matter what former owners may have done to them. They all meant well and times and these cars change. Back in the late '60s very few people would get a strong running L79 and just leave everything stock. Everybody loves these cars, and few can tell a 100 point Top Flight/Duntov/Triple Crown/Bloomington Gold car from a very nice, clean driver that sounds boss with the side pipes at any local car show and cruise-in. So just enjoy it no matter what anyone says here, but we do hope you will continue to be an NCRS member and keep your car in the fold, most of us here really care about these cars no matter what.

[John H.]

Re: Side Exhaust Pipes

The Left side casting number is 3749965 LH 7 GM
The right side is 3747008 or 3747038 or 3747088 The second to last digit is illegible. then blow it is RH GM. This manifold has a place for the thermal tube to the carb but it is unused.

Paul -

The LH manifold is from a 1958-1963, and the RH is from a 1964-65; both have 2" outlets.