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Gary, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1057
Experience:  Senior Technician
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1981 305 small block starting popping through the carb

Customer Question

1981 305 small block starting popping through the carb suddenly.All electrical checks out ok pulled valve covers started engine two rockers not moving much compared to the others
Submitted: 1 year ago.
Category: Chevy
Customer: replied 1 year ago.
one rocker on each side looks like intake on the left and exhaust on right #3 and #4 cylander
Customer: replied 1 year ago.
anybody there
Expert:  Gary replied 1 year ago.

Hello there,

Can you give me some specs on the engine, stock, mild rebuild, camshaft etc?

You may have collapsed lifters or worn cam lobes.

Can you check all the valves close fully in sequence?

Can you do a compression test after, if all valves appear to be the same height (valve stem tip)?


Expert:  Gary replied 1 year ago.

Sounds like the popping would be an exhaust valve not opening, it has to go somewhere, hence the popping back out the carburettor.


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