popping thru carb at full throttle

[blanman1973]

ok guys ive tried everything i can think of.its popping thru carb at full throttle.ive adjusted valves again timing been moved all over setting changed carb still doing.installed all msd igntion still doing it.any sugggentions im at a loss.its a 468 bbc. ive changed jets size changed squiter size.what else would make it pop on big end.its idles just fine only when i get full throllte its starts popping thru carb.

 

[LS6 Tommy]

Sounds like a lean condition at WOT. Did you check fuel pressure, filter and fuel pump?

Tommy

 

[lurchsmalibu]

Possible spark issue?

 

[TTLSX418]

you using platinum plugs?

 

[Grcrygtr44]

I'd say fuel issue too. Had similar prob at the big end and hooked up a pressure gauge. Found out my pressure was dropping from 7 to 6 almost 5.5 put a bigger pump (more gph) and it the pressure stayed rock steady after that and no more pop or flutter at WOT

 

[woody31]

valve float,,,weak valve springs.cant believe no one has said it yet,,