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What I have found is, I have removed the fuel filter that was place between the tank and fuel pump. I believe that this will take care of the problem of the car wanting to stumble after getting on it. I have not been able to test it though because it won't start. I have traced it back to the Ignition Pulse Amplifier. Dam!! I am waiting for the new module to arrive and hope that there is not an incompatibility issue with the pick-up-coils. More to come.
Follow up. I have replaced the Ignition Pulse Amplifier and took the car out for a hard run and it seems to run perfect. So I was curious about the original problem of it stumbling and eventually dying. I put the fuel filter (new) back on in the originalposition and took it out for a hard run and the original problem came back. So the conclusion is that it was the filter on the input side of the fuel pump that was causing the problem. Although, the Ignition Pulse Amplifier has dramatically improved the over all running and performance of the car.
Another update. After putting a few more miles on the car the problem came back (DAM). I decided to purchase another carb and shelf the original one. I called Holley and talked to tech support and gave them the model number of the original and they could not find any record of that model. We decided that a 750 they had was a pretty close fit and the tech asked why I was replacing the original. I gave a complete description of the problem and he said the I should try using a one inch Phenolic Thermal Insulating Spacer. I ordered one and installed it and have to say the car has never run so good and strong! The only thing now is to figure out how to adjust the rod that goes from the manifold to the choke since the carb now sits a inch higher.
Another update. After putting a few more miles on the car the problem came back (DAM). I decided to purchase another carb and shelf the original one. I called Holley and talked to tech support and gave them the model number of the original and they could not find any record of that model. We decided that a 750 they had was a pretty close fit and the tech asked why I was replacing the original. I gave a complete description of the problem and he said the I should try using a one inch Phenolic Thermal Insulating Spacer. I ordered one and installed it and have to say the car has never run so good and strong! The only thing now is to figure out how to adjust the rod that goes from the manifold to the choke since the carb now sits a inch higher.
Look on Holley’s web site under carb accessories.
There are hundreds on components listed there, that and there tech’s might be able to help.
Last edited by OldCarBum; Oct 12, 2019 at 06:37 PM.
Much like JR1970, I look at various 1970 Corvette’s For sale and came across the one below. We have four 1970 cars in our family (original owner 5 star bow tie LT-1, two L46, and LS5), so just keep tabs on things.
the stamp pad is the later post 1977 block, seems polished, and numbers are no where near straight so definitely not the original engine. Fairly early car, and seems decent otherwise. Only other glaring thing was missing smog pump. Asking price seems too high for the issues.
Besides the engine block and smog system. Water pump, radiator cap, radiator, alternator, carburetor, exhaust manifolds, air cleaner lid and breather hose and possible it base, rear strut rods, windshield, wiper motor, shift ****, wiper door relay and center instrument bezel are all not original. Who knows what else in missing or has been replaced. At least $24k over priced.
There was a white 71 LT-1 with black interior along with every option, including dealer installed right side mirror sold for 49K. It had every award that one would want, along with documentation on a pristine car.
There was a white 71 LT-1 with black interior along with every option, including dealer installed right side mirror sold for 49K. It had every award that one would want, along with documentation on a pristine car.
Several months back I was approached by a fellow Brit who had just imported a '72 LT-1 that was having running issues and he couldn't find anyone that would work on it. My only recommendation was to haul it 200 miles North to the mechanic I use. Well he did 10 weeks ago and came back to collect it today and settle a hefty repair bill! It still needs a gearbox & diff rebuild next year but for now he can finally put some miles on it.
Couldn't pass up meeting and getting a rare photo opportunity this morning. Mine is on the left
