I am trying to help a board member out. He is an hour away from me. His 455 engine and Qjet carb are fresh rebuilds elsewhere, and the complaint is “popping through the exhaust”. In my experience, that usually means fouled spark plugs, so he removed the plugs today and indeed #2, #8 and #5 are the worst, far too rich on those cylinders and are obviously fuel fouled. On the stock intake, the passenger side primary feeds cylinders 2,3, 8 and 5, so it would appear that the never-ending carb issues that he has had are continuing IF the Edlebrock Performer intake has the same port feed configuration as the stock intake. Can anyone confirm?
Tom, That was my thought too. I don’t recall the B4B or Performer being a completely re-designed dual plane intake, or like whatever that Poston thing was either.
Same except B4B had a longer runner to #1, so to compensate we'd run one jet size bigger on the primary driver side.
Same here...had to stagger jet driver's side up to .003 more on B4B.....until I had it equalized by Tomlinson. Ran smoother as well....
Yes, I’m well aware of the stagger jetting for the B4B. That’s not the concern here. The concern here “overfueling” on cylinders that draw off of the primary side of passenger side of the carb. So much so that it’s backfiring out of the exhaust, and knocking out 3 cylinders by the looks of the spark plugs that I was sent pictures of. I just wanted to make sure that a stock intake and Performer intake fed the same cylinders, as the car is not at my shop, to try to help with diagnostics. It’s odd that it isn’t a classic “flooding” situation, where all of the cylinders are affected. This carb has made the rounds, and it really needs to become a doorstop.
