Chevy 350
https://cimg5.ibsrv.net/gimg/chevrol...e2572a59b.jpeg https://cimg2.ibsrv.net/gimg/chevrol...55d05d5db.jpeg https://cimg3.ibsrv.net/gimg/chevrol...61c57fbba.jpeg https://cimg4.ibsrv.net/gimg/chevrol...f1cee8424.jpeg What can you tell me about this engine I believe it’s a 1975. The bore size measures at 3.998, I was told it has newer pistons in it? There doesn’t seem To be much wear in the cylinders can’t feel a ridge with my finger nail. They said they tore it down to replace head gaskets but never finished. I’m trying to decide it I should run it or does it need completely stripped and sent to the machine shop. Hasn’t been disassembled very long. |
Originally Posted by Bc419
(Post 361227)
Photos deleted for bevity: What can you tell me about this engine I believe it’s a 1975. The bore size measures at 3.998, I was told it has newer pistons in it? There doesn’t seem To be much wear in the cylinders can’t feel a ridge with my finger nail. They said they tore it down to replace head gaskets but never finished. I’m trying to decide it I should run it or does it need completely stripped and sent to the machine shop. Hasn’t been disassembled very long. You won't want to find out, after you install this motor, that they are out of spec and your oil pressures are too low, or that you have noise/clatter that should not be there. On the plus side, the pistons look very good, and with little carbon build-up too! I would definitely chuck the oil pump, no matter what, as well as replace all the seals. I'd install a Cloyes timing chain as well, You'll never have to worry about it again. They are built as solid as a rock, in my experiences, and not just with Chevrolet's engines either. A good carburetor would also be of high priority to me, as well. Holley, first choice; Carter/Edelbrock in 2nd. Those mid-1970's motors, not just GM, but all of them are what I refer to as "Smog Motors", so your compression ratio is likely 8 to 1, or 8.5 to 1, Not exactly as powerful as thier predecessors, but all the vehicle manufacturers had to meet the US emission standards of the day, and dropping compression ratio's was one of those long-abandoned notions, way back then. |
Thanks for the reply Henry! I was leaning toward remanufactured. I’ve been itching to throw a cam, pistons, heads and intake on a 5.7. If it is remanufactured wouldn’t they of shaved the deck bringing the compression up? I’ve got lots a questions lol Ive did research but mostly finding artical builds. Maybe I should get a book! |
Originally Posted by Bc419
(Post 361230)
Thanks for the reply Henry! I was leaning toward remanufactured. I’ve been itching to throw a cam, pistons, heads and intake on a 5.7. If it is remanufactured wouldn’t they of shaved the deck bringing the compression up? I’ve got lots a questions lol Ive did research but mostly finding artical builds. Maybe I should get a book! When GM switched to open-chambered heads, due to the smog laws, horsepower ratings dropped like a rock. My father replaced a 1969 C-60 closed-chambered 366 C-I Chevrolet motor with a 1975 366 open-chambered mill and the sudden drop in performance was _VERY_ noticeable, as well as decreased fuel mileage to boot. I finally swapped out the heads, and the engine ran as it had before it was swapped, with a few other modifications done as well. Medium-duty trucks are exempt from smog laws. Ultimately, what kind of 350 cubic inch Chevrolet motor that you want to build will depend on the "Vehicle Emissions testing" or "SMOG" laws in your particular state. BTW, 1975 was the first year that catalytic converters were made mandatory in all 50 US states on light gasoline vehicles. Back then, the catalytic-converters depended on the A.I.R. system to control air-pollution, but today's modern vehicles no longer need a "smog pump", thankfully. If you live in a state that tests for "smog" you may be limited in what you can do, in regards to passing any emissions testing for registration of your vehicle. Had this been a 1974 vehicle, or if you choose to install the motor into a pre-1975, non-CAT vehicle, you can do whatever you wish to do in any US state, to the best of my knowledge. |
Smog is not a issue I'm in the flat parts of ohio. I think I determined it’s a GM Pontiac 350.....the engine Vin is 054135439. 0 being GM Truck Pontiac. I’ve read some good things and bad, next chance I get I need to measure the mains webs! Provided there not thin I think I’ve decided I need to go with a stroker kit on this one! Can anyone clear up it being a refurbished Goodwrench 350???? Then I run into charts saying I have 1968 350ho heads casting number #18 which are great performance heads?. What are the chances I have a remanufactured Pontiac 350 that they put HO heads on it. |
Originally Posted by Bc419
(Post 361255)
Smog is not a issue I'm in the flat parts of ohio. I think I determined it’s a GM Pontiac 350.....the engine Vin is 054135439. 0 being GM Truck Pontiac. I’ve read some good things and bad, next chance I get I need to measure the mains webs! Provided there not thin I think I’ve decided I need to go with a stroker kit on this one! Can anyone clear up it being a refurbished Goodwrench 350???? Then I run into charts saying I have 1968 350ho heads casting number #18 which are great performance heads?. What are the chances I have a remanufactured Pontiac 350 that they put HO heads on it. |
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