I need suggestions on my pop back thru carb coming off idle with FOM in drive? MSD 8383 Dist with 12 degrees advance, ISKY E-2 cam at 17 degrees crankshaft advance, Fuel pressure not within Holley spec of 6-6 1/2 # I am at 3-4 # with mechanical pump. Fuel levels in site glass at idle are where they are suppose to be. Idle RPMS set a little high at 900 since this is a A/C car. I have taken all the slack out of carb pump arm. Motor does not diesel on shut down. The low speed set screws are responsive and set 1/2 turn out at 16 in. of vacuum. Engine in good condition as has fresh rebuild. Carb is excellent once off idle and at Hwy speeds. Holley Part # SL-450-VS.

56 VIC  Gene Stoehr Sr.

That carb is a little small, you need to work on the accelerator pump curve, a 3310 Holley is a better choice

"Holley Slayer" ?!  What is that?  Is that a reference to a  Summit carb or?


Paul

Holley touts this new Quick Fuel Technology. Made in Bowling Green Ky. Go to their web site and check the part number. All I can say the motor pulls as hard as any Y-Block I have ever owned. I like it!!!

56 VIC  Gene Stoehr Sr.

I will work on pump delivery. I was thinking not enough fuel might be the problem.

56 VIC  Gene Stoehr Sr.

With your combo the 450 sounds a little small. My engine is similar to yours and I'm running a Quick Fuel Sl-1957e 600 cfm. I'm far from a expert but it sounds like it may be a lean issue. Have you looked at your plugs?

Durham Missouri

Is your cam really at 17 deg. advance? You degreed it? That's your problem I'd say.

"FREE SAMPLE"

Isky called for 15 1/2 degrees advance was 1/2 under and I added 2 degrees to put the cam at 17. Per degree wheel.

56 VIC  Gene Stoehr Sr.

Haven't done the plug check. Just removed a 3X2 set up that I finally got tired of tweaking so would have to change plugs for a better look.

56 VIC  Gene Stoehr Sr.

Could you have misunderstood ignition advance for cam advance?


Lawrenceville, GA