Do you recognize this Holley carb?
pete9857 said
.420 , maybe a shade larger
Click to expand...
The venturis are much larger than that. I'm guessing .420" is the booster diameter??? Measure the actual venturi where it necks down. It'll be somewhere around 1-3/8" or so. You can bent a paper clip and use that as a measuring tool if it helps.
Print