Hey guys Im wondering if someone can mesure the diameter of the venturi on and 750 cfm main body and the diameter of the throttle bores on the baseplate. I cant seem to find this info anywhere. I would prefer the mesurements to be done with a caliper or something else thats accurate.

If you dont get a response, you can just measure a baseplate gasket....the difference between 850, 750, 650 is enough for the naked eye, so a ruler should be fine

for stock holley stuff the mesurements are easy to get. Im looking for a mesurements of the proform aftermarket parts. Holly carbs use the same diameter throttle bores on carbs from 650-800cfm the diffrence is the ventrui size. On the proform stuff they say the mainbody is a replacemebnt for a 650 and 750. Im wondering what ventrui size they use is it 1 5/16"(650) or is it 1 3/8"(750). On the throttle plates im wondering if they use the stanterd 1 11/16" (650-800) or if they steped it up to 1 3/4".


Basicly im trying to find out if its a worked 650 or a stock 750.

The throttle plates are the same as a 650-750 Holley...we had a cracked baseplate on the 750 on my sons truck,ordered the proform baseplate...then someone gave us a 650 dp,,,throttle plates were the same size...if thats what you're asking

So the throttle plates on the proform baseplate is the same size as the ones on the 650?

Now All I need is someone to mesure the diameter of the ventrui on the proform main body thats rated at 750cfm.