what it might be

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08-09-2006, 01:33 PM
hotroddaddy

what it might be

What might cause the engine to pop, kinda sounds like backfire from most cylinders, when i let off the gas , like coming to a stop, but idles fine and no hesitation on accelaration or misses,otherwise runs fine except when i let off gas then pop pop pop,before you ask heres what i did, got heads redone,set valves the way the book said, by cranking the bolt till you can barely spin the pushrod, then 3/4 turn,set the distributor to #1, set timing to 8 degrees btdc, brand new edlebrock carb , no adjustment made, checked for vac leaks none to be found, distributer vac hooked to non manifold port on carb
08-09-2006, 02:18 PM
cammerguy

If the lifters were bled down (no oil in them) you have to little clearance. I usually adjust hydraulic lifters with the motor running until the ticking stops the another half turn.
08-09-2006, 02:55 PM
lucforce

If you quickly let of the pedal and have a good carb return spring, you can lean out an engine suddenly when the throttle blades slam to idle.
08-09-2006, 03:20 PM
HOTRODPAINT

If the pops are coming out of the exhaust, it could be air leaks in the exhaust system.
08-09-2006, 03:25 PM
hotroddaddy

Quote:

Originally Posted by cammerguy

If the lifters were bled down (no oil in them) you have to little clearance. I usually adjust hydraulic lifters with the motor running until the ticking stops the another half turn.

That might be it, i did not prime the lifters, plus i do have a good return spring thanks guys, ill keep messing with her
08-09-2006, 06:30 PM
1JohnnyO

I would not think the lifters are your problem I go 1/2 turn, no more...but 3/4 likely wont cause you any problems, whether they were pumped up or not. And it's just a personal preference, but it makes a terrible mess to adjust lifters while the engine is running, and I dont like to make messes. If you adjust like you did, and give a 1/4 to 1/2 turn, you'll be fine.
08-09-2006, 07:20 PM
pro70z28

I agree with Hotrodpaint ;)
08-09-2006, 07:22 PM
hotroddaddy

Would leaks at the header do that?
08-09-2006, 07:48 PM
HOTRODPAINT

I would look anywhere "upstream" from the exhaust opening, all the way to the header flanges.
08-09-2006, 07:57 PM
pro70z28

Quote:

Originally Posted by hotroddaddy

Would leaks at the header do that?

Yup. I guess I need @ least 10 characters. yup:D :D :D :D