I have a 331 in my 68. It had a Carter AFB but did not run very well, or start very well. Since everything else was new I replaced the carb with a Holley 4160 600cfm carb. It started right up and I drove it a few miles. No problems with warm or cold starts. The next day I started it again, it did not start as quickly, but it started. It ran pretty rough, did not want to rev, and backfired when I tried to do so. I let it warm up, then shut it off. Immediately I tried to start it again, it would not start. It just cranks and cranks and cranks. I happened to have 2 4160s so just for the heck of it I put the other one on. Same thing.
The car is getting air. Fuel squirts in when I push the throttle by hand. Spark is not super great, but it managed to arc from a wire. Fuel pressure fluctuates between 5 and 8+ psi, which I know is a little high. Fuel pressure with the first Holley was lower, but I do not know what it was when I tried to start it. I used to have a FPR lying around but can't find it.
My dad thinks it is ignition, but voltage is fine and like I said, it sparks. It ran yesterday and the day before so I think ignition is not the problem. But I think the carb is flooding. Again . I have tried to describe the problem as best I can. It just cranks, it doesn't even get close to starting. I can post a video if necessary.
edit: fuel pressure seemed higher with the 2nd 4160 but again I had the same problem.
Any assistance would be greatly appreciated.
The car is getting air. Fuel squirts in when I push the throttle by hand. Spark is not super great, but it managed to arc from a wire. Fuel pressure fluctuates between 5 and 8+ psi, which I know is a little high. Fuel pressure with the first Holley was lower, but I do not know what it was when I tried to start it. I used to have a FPR lying around but can't find it.
My dad thinks it is ignition, but voltage is fine and like I said, it sparks. It ran yesterday and the day before so I think ignition is not the problem. But I think the carb is flooding. Again . I have tried to describe the problem as best I can. It just cranks, it doesn't even get close to starting. I can post a video if necessary.
edit: fuel pressure seemed higher with the 2nd 4160 but again I had the same problem.
Any assistance would be greatly appreciated.