flathead31coupe
Well-Known Member
with my 66 dart and a mild built 440 I have a 850 holley that has percys adjust a jet blocks, 50cc pump pri and sec. with 41 squirters, I want to put back to out of the box cond except for the percys blocks. my Question should I go back to stock 850 and star from there, or this by sujestion.. Holley lists as having 80 front, 78 rear jets. 6.5 PV's in both. 31 squirters in both. My suggestion is ditch the secondary PV, jet it 88. Squirters may need to be larger, have 35 and 37 available as well. Use green pump cams, have blue available.