427 dart block with 750 quick fuel, cold start trouble

[Jerry Clayton]

we won't learn nothing-I already know-you will learn how muck gas leaks into your engine-you will then determine that its maybe the power valve and replace it-----

[427BDR]

Originally Posted by Jerry Clayton

we won't learn nothing-I already know-you will learn how muck gas leaks into your engine-you will then determine that its maybe the power valve and replace it-----

got it, I think the ideas are good and the carb probably needs to come off and the PV replaced. But before I do this what if I have a couple of badly fouled spark plugs? could that cause potential flooding on a cold start if 1 or 2 cylinders are not firing because of dirty spark plugs and just pushing gas into the engine?

I'll pull the plugs and change the fouled ones and try a cold restart later this week. If that doesn't improve things then the carb comes off and we attack the PV.

Thanks all, very much appreciate the insights!

[Gaz64]

I'd sort the carb first.

The rough running does eventually clear, and the engine runs fine after that.

Fit your new plugs after you have sorted the fuel leak.

[jhv48]

Your problem is with the carb, not the plugs.

It sounds like a fuel percolation problem. Somehow, you've got to insulate that carb from the engine temp during the winter months when our gas turns to crap.
You can always get a drop base air cleaner to fit under the hood so you can use a phenolic spacer to help insulate the carb.

Also, try opening the hood as soon as you get home and leave it open. Helps dissipate the heat quicker.

And, finally, most newer carbs have blowout proof power valves, so I doubt that's your problem.