My engine is breaking up when my secondaries open initially... Is it too rich or too lean? It's a brand new Holley 750 double pumper..Also primaries are too rich. I drilled .125 hole in each butterfly, it helped alot but needs something else.vacuum in drive at temp. is about 8.5 power valve is a 65,could this be a problem?
Bill need some Info what do you have the 750 on. What size engine ROY
thanks for the reply...It's on a 377 stroker.
edelbrock performer rpm heads
edelbrock performer rpm intake
3.73 rear gear
"32 ford "vicky" approx.2100#
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