Any holley carb experts that can help

[adrianMCmoreno]

Any holley experts in the group

Here's what I have sbc 350 stock it's a Holley 670cfm jets are size 68 and squirt nozzle is a .35 not a double pumper

My issue slight popping in exhaust while accelerating more like a pff pff pff. It's very random sometimes at accelerating and sometimes at cruising speeds.Its definitely not a timing issue any advise or tips would help. About to check what power valve is in it

Dont think it's a burnt valve heads had a valve job 3 months ago

 

[500/600]

35 nozzle is huge fo a 670. Try a 25-28

 

[565bbchevy]

31 nozzle would be the standard size for a 670 vacuum secondary.
Is this a Holley Street Avenger?

 

[adrianMCmoreno]

31 nozzle would be the standard size for a 670 vacuum secondary.
Is this a Holley Street Avenger?

Yes it is It had the the 68 jets when I first got it then I put the 65 jets in but put the 68 back then I put the 35 to replace the 31

 

[500/600]

People have put 600 Holleys on stock 350s for years. And they were always pig rich. I figure this one is no different. Where is your initial/total timing? Get the 35 squirter off of there first. Personally I’d go back to 65 with a 28 and as much initial timing as it can stand. Do you have vacuum advance?

 

[adrianMCmoreno]

People have put 600 Holleys on stock 350s for years. And they were always pig rich. I figure this one is no different. Where is your initial/total timing? Get the 35 squirter off of there first. Personally I’d go back to 65 with a 28 and as much initial timing as it can stand. Do you have vacuum advance?

Thing is the block doesnt have a timing tab I've been putting off putting one on because I dont want to pull the serp setup off

 

[500/600]

Bump timing up some and see if anything improves

 

[adrianMCmoreno]

Do I put 65s in the secondary too

 

[DRIVEN]

I'd suggest putting a vacuum gauge on it to rule out any mechanical issues before going too deep into carb tuning. You're looking for a rock-steady needle somewhere in the high teens. Might give you an indication of a base timing issue too.

 

[adrianMCmoreno]

I'd suggest putting a vacuum gauge on it to rule out any mechanical issues before going too deep into carb tuning. You're looking for a rock-steady needle somewhere in the high teens. Might give you an indication of a base timing issue too.

What # am I looking for on the gauge