well i have a 305 ,5 speed 470 lift cam,323 in the rear ??? looking to buy a car carb.I have a few to pick from a carter spead bore or go with a vac sec 600cfm holley or holley 650 cfm dp mech sec.I have owned a 650 mech sec and had no prob but that was on a 350.Don't really know
go with a 550-600 cfm carb.........and if you have a manual transe try to get a mechanical secondaries carb.......tho ive ran a similar setup yrs ago with a 600 cfm vac secondaries carb with no issues.just had to tune the secondaries by changing the spring
There aren't many suitable performance DPs that come much smaller than 600-650 CFM. Smaller carbs tend to be VS designs for fuel economy, or DPs for dual carb NA and blower setups.
well i found a 650 dp ms for $50.00 i think its a score for the price in pretty good cond ,but i also fount a 600 vs in almost mint for $30.00 what would be the better one i am borrowing a holley 600 vs from some one i know for now but i don't really feel the sec ??? it worked perfect on his motor he says i just don't like the feeling is this the way the work i had all ms in my motor but they were all 350s
You shouldn't ever feel the secondaries if a carb is tuned properly. Either of those would work, the DP would be preferred. Expect any used carb to need a rebuild.
the 650 is a good choice specially with the price being so low...please go thru the carb and also try these jets 62/70 or 63/71 should be good for what u need
Well not to take the conv some where ealse but the reason for switching carb is because my Qjet started acting funny but i think i found the fix ??? Do any of you know if my Qjet shold read the same vac reading as a holly would ? I'm geting 16 from the holly and only 14 1/2 from the Qjet
