Thread: 383 <gasp> stroker runs <cough> rich

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Forgive me but my memory is fading. I was attempting to remember all the specs I had while typing from work. As it turns out, it IS a 650 with jets of 67 primary and 73 secondary. So unless someone thinks I should change the jets, I think I will just try these for now while I check other things, like vacuum and a new power valve.

Power valves: the higher the number, the more vacuum you need to close it? So with a low vacuum engine, a higher number would be desirable? Or why can't I just disable it with a plug? I suppose this would have a 3 fold effect: 1) using a bigger primary jet to compensate would just add to the richness I am fighting now and 2) cut down on economy (econa-wha? hahaha, what am I saying!?!) 3) I would guess reduce response unless the secondaries are open.

Would a single plane intake affect this (assuming it is leak free)?



As for exhaust in the cab, driving was fine. It's when trying to tune in the drive way or pulling up to a stoplight and getting the plume rolling forward after stopping.

Thanks for your help!!
Paul

I think I am attaching n older pic.