has a little bog off the line. or when you first hit the gas it dies a little. carb is a 4779. its jetted 70/76 with 8.5 pv orange pump cam up front and pink in back first holes. thanks for help.


my car is 89 formula 5 speed with 350 with 9.75 cr, trick flow heads, perform rpm intake, xe274, rollar rockers, holley 750dp, shortie headers into duals 2.5 in and posi 3.73

 

Are you getting an accelerator pump squirt as soon as the throttle blades move? Where is your timing set? Are you using vacuum advance?

 

yes as soon they open. and my shots are front 35 and back 37. timing is set at 24 base and 36 all in. yes im using vacuum advance. to base of carb.

 

On my 750 dp I had to open the secondary accelerator pump to .015 betwwen the screw and arm to cure a flat spot, I just used a feeler gauge between the actuator screw and pump arm,and it completely cured the problem, I had thought that there was supposed to be no clearance, but a friend of mine told me to try a little clearance and it fixed it, I imagine it may work the same on the primary accelerator pump as well, it sure will not hurt to try it.

 

I assume you mean the squirters are 35 and 37. That's a little large. You might actually be getting too much fuel.

 

whats a good size? i have a 31 but found my base plate cracked. so i changed the base plate to two corner idle one and used the rear two corner idle metering block. jetted the carb up a little. to 72/78 jets. used the pump cams on the base plate. 6.5 pv now. i got it to stop bogging now runs alot better uses alot less gas but i cant get my idle set it goes up and down like 500-1600 when it wants to. what could cause this?

 

Go through the steps in the Holley tuning sticky in the top section of this forum.