after driving car i observe gas has collected in small cavity at top of intake manifold. so i wipe it out with a paper towel and it happens again the next time. ok..i drive the car a ways leave engine running and check..no problem. i get home leave engine running..still no problem..turn engine off and watch a while....still no problem..check again about 4 hours later ..still no problem (engine still felt hot even 4 hours later..wake up this morning and there it is again...gas puddle in cavity at top of intake manifold. It appears something is happening after things cool down....anybody got any theories?
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Re: 67 3X2 carb overflow
Richard,
My 67 427/435,does the same thing. Had all 3 carb's rebuilt 2 years ago, my carb guy tells me the o-rings inside the lower base plates, where the throttle rods exit through the base,expand and contract with heat. Bottom line Holley's are leakers over time. Keep a good supply of commercial type paper towels handy. after a days cruise, the next morning i'll wipe up the excess with a light dab of acetone on the towel, all is as it was before, clean until the next cruise.
Don -
Is it the center carb?
If so, take a close look at the accelerator pump mechanism. Sometimes the diaphragm will seep a little - the 4 screws may need to be snugged.
MarkComment
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or the pump cover is warped and needs
sanded flat. these carbs leaking down caused a lot of BBC engines to expire because of gasoline in the oil. the next time you park it remove the gas tank cap and see if it happens.Comment
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