Ok well this problem has been a issue for a while now. From about 3000 rpm to about 4000 rpm this engine sounds like a can of marbles its pinging so bad. The thing is, it clears up after 4k and is fine before 3k. When i give it about 1/2 to 3/4 throttle the car feels like its surging, like it has the power but somethings holding it back, it will like studder almost. Kind of hard to explain. The carb is a brand new Holley Street avenger 670 vacuum sec. The distributer is a new MSD hei with 6a box. I rejetted the carb to 68 primaries and 70 secondaries but it didnt help anything. The problem gets really bad once it gets hot outside. Is this a problem of recureving the distributer? Or are my secondaries not opening correctly? Help me here guys please

 

Oh, and you'd think that with all the junk in this car that it would be able to do better than a 15.6 in the 1/4. I just can't get this thing tuned! Do you think that that stock tbi cam in the crate engine is holding me back THAT much? Thanks

 

Anyone??