popping at high rpm

OldmanRick said

I agree rocker gear and springs are a good place to start. I doubt you hurt the pump. Remember they only pump at half engine speed because it's cam driven. If you haven't already, pull the plugs and check for a closed gap or broken electrode. It's been run lean because you picked up 2 tenths by jetting up. Not likely, but easy to check. If your timing didn't change after this then i doubt you hurt the chain or distributor shaft. Was the valvetrain noisier after this happened? Even a stock bottom end and valvetrain can take a quick buzz to 7,000. I've done it, even a few times on purpose....lol. I'll keep thinking:-k and post if i think of anything else.

As a side note, what rpm were you "running out of engine" at on the top end? That combo should pull to 6K with no problem.

P.S. This is probably your cam.....
http://www.summitracing.com/parts/CCA-20-232-4/

Click to expand...

thanks for the response rick


the valve train seemed the same, and like I said under no load i can run it up to 6-7 grand and she won't miss a beat but on the track a whole nudder story.
As for the rpm that i was running out of power it had to be in the high 4's but i'm not really sure due to the fact that it was a night run and the tack light wasn't working. But like I said I believe i got that problem whipped.

Well i checked the rocker assembly and it's fine, i pulled the plugs and they are all tan and in one piece. Tomorrow i'm going to take the carb off and check all jets just to make sure that in an off chance that one of the jets got plugged with who knows what. I checked all valve springs and rolled the push rods, nothing seems to be bent or broken.
I've got an extra ignition box and coil that i'll install and try test and tune this wednesday.