popping at high rpm

crackedback said
I'll guess something bent/broken in valvetrain.

Any of the plug gaps closed up?

5/16 line can feed that OK, a 3/8 line would be better. Suck air through a 5/16 line and then do the same with a 3/8 or 1/2 line. The mechanical fuel pump does the same.

As a baseline, try to jet change 2 sizes at a time. Only time I would go more is if I had an air/Fuel meter that displayed a really rich/lean condition.

I'm with ya cracked, I change jets 3 sizes as per spec in my holley tune book
but 2 wouldn't hurt. I have a air/fuel wide band gauge in the car it's burning about 13.1-2 throught out the quarter.
And no I pulled all plugs, they're tan and still gapped correctly

70aarcuda said
anytime i over rev an engine...i run a compression test to see if a valve might have kiss a piston.....plus check for bend pushrods or broken valve spring.....

if you floated the valves it would be easy to kiss a piston...only takes a few minutes to check..

did the pushrod check, alls good. checked all springs, without removing and putting them on a compressor they looked good. Compression test is next. After the 1st popping run I put a heat gun to the cylinders and they all read just about the same with the front 2 (1-2 cyl) running about 30 deg cooler. due to having the coolest water.

805moparkid said
hey no worries... im still hunting down my issue lol... as for mine i think its leaning out but im having a hell of a time proving it...

I'm crossing my fingers for ya.