Where should the floats with the plastic site plugs on a 750 holley DP with mech. secondaries be set at? Do you go by the fuel or the looking at the float itself? I know the front should be just below the plug hole but what about the rear? Thanks

set the rear just below the sight hole. front should trickle out the sight hole. Check with engine running.

Ok, but I thought with those ( clear ) ha. site plugs... I didn't think you would have to unscrew them. They're pretty fragile I might as well get the normal ones.

I would. More accuracy.

The clear ones are for tuning only. You aren't supposed to leave them on when you run.

Boy do I feel dumb but they were on the car when I bought it. Thanks five7

No need for that. It isn't well understood (I didn't up to about 2 years ago), but they don't stand up to constant fuel exposure.

BG, QFT, some others build the site windows into the bowl - nothing to unscrew. The way Holley should have done it (I believe they are in some models now).

Ok I finally gave it to an expert and found out it has so many problems in the secondary side I'm having it checked to se if it;s worth fixin or buy a custom local built.

"problems" how?

blocked passages? just drop them in carb cleaning solution, sold in a gallon pail like a paint can and then blow out with compressed air.

The needle screw threads in the top of the float bowl were stripped out, no power valve they were blocked off, #82 jets, warped throttle plate, no top vent tubes, need I say more........