5.9 AKA 360

I put on better heads/springs, short c.a.r.b headers, Taylor thottle body spacer , magnaflow cat and dynomax ultra flow.

I think it runs a little lean now. Pulls into 5500 rpm, comes alive at 2800 rpm with w.o.t.. but also snaps great off the line with 1/4-1/2 throttle. Doesn't seem to have enough fuel at passing speeds 70-85mph.....it will climb rpm fast at part throttle. Need to look at a plug to verify, but I think injectors or air temp sense or somethings out of tune. The heads are 50cfm over stock, the intake port matched and steel mahl plenum gasket used to avoid blowouts and oil sucking. Stock air filter box with K&N filter. I'd like to do the throttle body..but it needs more fuel first.
Mileage is the same pretty much.