I suspect heat soak in my 454 from running too lean. The q jet it came with was for a 1970 350/350 combo. It now is on a 454/ 4spd a833. Current jets are 76 and 44 metering rods. The correct q jet for my set up would be 78 jets and 49 metering rods. Am I better off to switch these out or get a new carb? I just got a 3/4 wood carb spacer and a cool-tec heat sleave for the mech pump to carb hardline to help with the heat, but if I am to lean, these won't solve my issue. Any help would be appreciated! Thanks, Chris
I'd suspect your heat soak problems are due to the gas they sell nowadays. Winter gas + warm weather = problems Lean could cause other problems. Or not.
I'd like to know if the gas blends are causing problems on lots of older carb cars? I'm in the northeast and maybe we have more ethanol, maybe not, but I have had to rejet 2 old cars in the last month. The one I just did is a 48 plymouth woodie. The guy said it always seemed like plug missfire on hills. Just sitting still while holding it at 1800 to 2000, it really missed a lot. I just barely pulled the handchoke and it revved a lot higher and was smooth as silk. I drilled it out twice, in steps, and it runs mint. second car was a 40 year old bug standard trans. Bucking on medium loads like the Ply. The VW had a smaller main jet made for auto trans. The auto trans bugs had problems with epa tests back then. I put a standard-trans size jet in and it runs good. I almost think it could have used a bit bigger. If every car had a hand choke, it would be easy to tell while driving, if it was "way" too lean.
I would look at the fuel well seaping a little gas at the butter flys a commond issue with Q jets jets seal with apoxy and done
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