holley mixture distribution
Any Holley gurus out there? the Performer RPM manifold has two plenums, one of which appears to be rich and the other is lean, #3,5,2 and 7 is supplied by the passenger side plenum and seems to be lean, I wouldnt expect this much variation between each side of the carburettor.
for comparison I dropped on an Edelbrock 1406 carb which was running on a 327 with no issues, although it was running lean at least all the plugs looked the same, all the soot was burnt off in 20 minutes, I want to put the holley back on but need to find out why it is out of whack first.
I have replaced the carb with a metal plate complete with barbed hose fitting, backed off all the intake valves and fitted a hand held vacuum pump, I applied 15" vacuum which took 1/2 hour to bleed off, I thought this was pretty good.
I suspect there may be a blockage somewhere, anyone had a similar problem or know where I should be looking? yes it pings under load and it is a 383 SBC 10:1 AFR 195 aluminium heads XR282 HR cam, Holley HP 750