Carb tuning help

NorwayCuda69 said
hmmmm.. i opened a few old carbs just today.. checked if it was.. i fond all of the metringblocks i had was the same size.. exept for a pretty new 750.. no i had 4 650 mtringblocks 2 750.. and 1 850.. all metringblocks had same pvr holes.. mystical.. i think maybe u gys are refering to some aftermarket or the newer, maybe bigger like dominators have larger?.. mainly the hole in the pvr itself are alot smaller than the 1 in the block.. but its the spring tention that is different and u could tune the amount of vacum needed by changing the pvr

I've ran across some that are the same but I guarantee you all are not the same as you saw by the one 750 that is different and I didn't mix them up with a Dominator or aftermarket block cause I have never even had a dominator in my hands. How did you measure the PVCR size? I measured them with numbered drill bits that I mic'd to make sure of their actual size so I know their not the same on all 750 carbs which is all I have ever checked them on. I have a log of every one I did along with the list numbers. I will note that even though they were all 750 carbs they were different list numbers. i.e. 4779, 4779-1, 4779-3, 4779-5, 3310-3, 1850. In fact not even one of the carbs I just listed had exactly the same size PVCR's. Some were pretty close but still not the same.