tunnel ram tunning help 408sb

1Fast340 said
i think i would translate it into the engine breaking up at higher rpms:)

i agree with 340_8bbl on this one, what kind of ignitionsystem and have you checked all the wiring,connectors and grounds? what kind of fuelpump are you running?

third option would be valvefloat,but i realy doubt that one,since you wouldnt get it to 6500rpm if the valves start floating at 5000.
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the ignitionsystem is a new mopar performanc distributors,
and msd 6al box, new 8 mm ignition cables and champion spark plug,
ignition is set at 35 degrees.

the fuelpump is a Carter Muscle Car Mechanical Fuel Pump M6866 120 gph

earlier I had an Edelbrock RPM intake on the engine and a 750 vac carb, I had no problems then,