Cornpatch MO
Well-Known Member
I am just about ready to tune my 750 cfm double pump, mechanical secondarys Holley
68 primaries--76 secondary jets. . 440 mild street engine . Runs good as is, but would like to see if it could do better. No dragstrip for times , locally.
1--hard to read plugs on todays gas, but tail pipes show rich on the inside
2-- is about 8 steps between primary and secondary jets about right ? to much or to little?
3--About how many steps , up or down , should I try on the jets?
4-- I would guess the first direction would be to try a leaner mixture?
I would appreciate any EXPERIENCED input................Thanks..............................MO
68 primaries--76 secondary jets. . 440 mild street engine . Runs good as is, but would like to see if it could do better. No dragstrip for times , locally.
1--hard to read plugs on todays gas, but tail pipes show rich on the inside
2-- is about 8 steps between primary and secondary jets about right ? to much or to little?
3--About how many steps , up or down , should I try on the jets?
4-- I would guess the first direction would be to try a leaner mixture?
I would appreciate any EXPERIENCED input................Thanks..............................MO