WHICH is better and why ??? Quality? Performance? Support? QF is about 100 bucks more than Proform, both drag race series.
my proform talks all holley parts.I’m not versed in pro form and barely Holley and trying to figure it all out. Do they take all the same parts like power valves and jets and gaskets or are they brand specific. And my apologies for side tracking the thread.
My Holley 750 DP takes all the same Proform parts.my proform talks all holley parts.
Holley wasn't one of the options. But thanks.Neither. Go find an early list Holley in what ever size you want and convert the bleed yourself. You'll save yourself a lot of money and be way ahead.
No one does. Discharge co efficients of jets in a liquid are far more stable and consistent.One thing I noticed about both is that the idle feed restrictors are in the top position. That's easy enough to fix though. On the engines I've had, they've always had more stable AFRs when the IFR is in the lower position. I have no idea why though.
So I gather it's best to buy the cheaper of the two as there is not much difference.
Does it have PVCF's? I couldn't remember if they did or not.I bought a Pro Form 950. Like posted above moved the IFR down and put T slot restrictors in and it works great. Idle bleeds, PVCR and emulsions are all threaded for adjustability.
Sorry, I meant PVCR's. I fat-fingered the 'R.' Thanks for clarifying. I couldn't remember if I had to put them in or not.Doe you mean pcv vacuum port yes. Power valve channel restrictors, yes, adjustable.