Someguy

have a stock 502 stock cam vic jr intake hp 500 heads and a holley 750 with power valve in primary and 75 jets and no power valve in secondary with 85 jets. Is this enuff carb, or do i need a 800 cfm or can i rejet ???
thanks
dan

Someguy

my 502 is being refreshed as I type was thinking about going up with the primary jets for break in ???

Griff

You need an 800-850cfm carb.

goldeneyee

I had a similar setup and used an 850 Holly with 82 square jetting. In dynoing the motor it was just about right...

getrdunn

iTrader: (7)

Didn't the 502/500 hp come with the 800 cfm 9022. There a good Carb. Even if you do faten up the jetting on that 750 I would be extremely careful. Personally I wouldn't even run it cause it's so dam hard to stay out of the throttles. Be sure and do pleny of plug checks if you do run it. If you need to go over 4 to 6 jet sizes go bigger carb.

Someguy

thanks guys
my 750 will b in the swap shop forum soon looking for a 800

wtfo

Which holley 750 is it? you can get it jetted right, but it will take a little more than standard jetting (ie maybe change air bleeds, drill the pvcr out some in the primary metering blocks, etc...). Note that you can swap out the body for a proform body to make it an 800.... IF it's a standard 4150 and the base plate and shafts, etc.. are in good shape, that would be another option. Just some thoughts

Griff

Another option is send it to Nickerson with your specs and he will get it flow more CFM and run better.

ACrooks69

iTrader: (1)

Have a 500HP 800CFM carb I'm willing to part with. Let me know if you are interested.