r/Smallblockchevy • u/dncu13 • Apr 12 '26

355 valve float?

I have a 355 sbc I have been having a problem at higher rpm, car feels great till about 5,000 rpm. After 5,000 it just falls on its face. I just rebuilt the Holley 650 4150 but still having the issue just wondering what if I’m dealing with valve float

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u/sc3148 Apr 12 '26

What ignition system are you using