Hey guys, Heres the engine..400sbc. new holley 4160 vacuum sec. timing set at 12 initial 36 degrees at 3000rpm. Cam is a crane .292/512 flat tappet. The engine runs fine at low speeds at this timing setting but when I punch the gas it just pops through the top of the carb. When I advance the timing it wont do this and actually provides the sound and performance I'm looking for. The problem is I'm over 40 degrees of total advance. I know you really don't want to be over 36 degrees on a small block Chevy. My engine just likes it more and it performs better. Could this be a carb problem? say a power valve or accelerator pump? I have already checked the floats and their good. When I advance the timing I can actually kick the engine up to Wide open throttle and it sounds great. I know to much advance can wreck your engine so I 'm a little worried. I bought a timing tape and installed on my stock 400 damper and verified TDC so that checks out. Any tips Anyone......Trying to get some performance here and be safe.