Technical Tuning Ford 292 y block have popping from straight exhausts

Okay tuning 292. Have older 4v intake so no vacuum port to do a vac test while tuning mixture on old Holley carb. I get popping from headers at idle. Not under load. Timing issue or what? Just replaced gaskets and replaced a bent rocket arm. Thanks


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If you installed to long of a bolt on the intake manifold, you could have bent a push rod.
Kennedy

 

Hmm
Okay will check pushrods. As I was writing this I thought about vac leaks from header flanges or possibly small leak in headers somewhere?


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isent there a Vacumn Port on the Carb!

Just my 3.5 cents
or when the Cows
come Home!

 

Just for the vac hook up for dizzy. I've got a holly but don't have a vac port where it should be


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why not put a T valve in that Port & use it for
your Vacumn!

Just my 3.5 cents
or when the Cows
come Home!

 

if you don't want to do that Unplug the Vac Plug going to the
Dist. and check the Vac as you want & then plug it back
where it belongs!
Just my 3.5 cents
or when the Cows
come Home!

 

If you have an exhaust leak it pops when you are backing off, not while idling. Something else to check is for a wobbly shaft in the distributer or sticking points. Probably not the problem but I would not overlook it. Loose shaft may overcome itself by centrifugal force and sticking points maybe by added revs.

Just athought.

 

Yes my thoughts too. I'll check tonight thx


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Okay running better, it was a combination of ildle mixture and incorrect valve lash settings. Wanna thank you guys for the help


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That was quick. Glad you get it sorted out.

 

Well after more tuning issues I found some major vac leaks at the 5,6,7 manifold ports. I missed them before. But will change out the gaskets today.


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Keep after it, you'll make it work.

I got call from a GM dealer in Illinois back in the '70s once. They had a Corvair that they just could not get sorted out and asked if I would come give it a look see. I spent a week there chasing little problems. Finally after everything it ran like a top. It didn't have one single problem just a whole lot of little ones. None of them major and none of them enough to make it not run by themselves.

 

Be sure to check the manifold and heads with a straightedge. Don't scrimp on the intake gaskets.

 

Porknbeaner
Yeah it's getting there changing out the manifold gasket was huge. Thx


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