High RPM flutter and pop on Big Block Chevy In pulling truck
Hey guys have a 468 big block, with flat tappet Lunati cam Oval port big valve heads, wieand team G intake with 850 Dbl pump Holley Carb that has been modified, All brand new MSD ignition 6 AL box, Pro Billit Dist New coil and Taylor 409 10.4 wires, Holley Blue pump with reg, All #8 Stainless lines with AN fittings. We have a High RPM flutter and pop from 4500 to 8500 RPM, WE have changed everything except the carb and valve springs My springs are K-Motion K1000 1.625 triple springs they do have some age on them but the pressure readings are good. Im running #86 jets in primary and#90 in secondary, I have 50cc pumps on both ends and the correct nozzels and screws. Was told possibly have a lean condition and need to richen up by 2 to 4 sizes bigger on the jets. The plugs look fairly good, Possibly a little grey but not too bad. Any help would be greatly appreciated, thanx Dennis..