dcala84141
Well-Known Member
I running an edelbrock rpm performer intake manifold on a stroke 383 to 450 with aluminum heads with an 830 quick fuel carb. At first out of the box engine was running very rich so I changed the idle fuel restrictors a few sizes smaller and main jets from 78 to 71 .My idle AFR at idle is 14.5 My AFR at cruising ( 2,800 to 3,000 ) is 13.3 My issue now is that spark plugs 1,7,4,6 which are on the low runners are rich and plugs 3,5,2,8 on the high runnings are good