Tuning with jets, Power valves and an O2 guage
Here's another little point to stick away. I haven't kept up on "all the models" of Holley based carbs, but most? of them the PV does not change jetting, except for the vacuum kick in point.
That is the "metering" in the PV is a combo of the additive of the main jets and the FIXED ORIFICES in the metering body. In some cases you need to drill those to get WOT where you want and still have reasonable cruise.
An example.........
http://www.carsandparts.com/Articles/General/Tech/tuning-holley-double-pumpers-part-1
Here's another little point to stick away. I haven't kept up on "all the models" of Holley based carbs, but most? of them the PV does not change jetting, except for the vacuum kick in point.
That is the "metering" in the PV is a combo of the additive of the main jets and the FIXED ORIFICES in the metering body. In some cases you need to drill those to get WOT where you want and still have reasonable cruise.
An example.........
http://www.carsandparts.com/Articles/General/Tech/tuning-holley-double-pumpers-part-1
