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Dave72dt · 07-11-2010, 02:13 PM

All of a sudden rich means your're dumping fuel and depending on carb type would suggest a blown power valve or a float problem.Losing your vac advance may also cause it to run fat.

Something you can try is to install a set of Rhoads lifters to get your vac pressures up. They bleed off some of the oil in the lifters at idle and pump up as rpm increases. Makes the big lift cams think they are a lot smaller and gives you a milder idle, higher vac but full cam specs when wound up.

07-11-2010, 02:13 PM	#10
Dave72dt Senior Member Join Date: May 2010 Location: SW WI Posts: 359	Re: Vacuum question on a 351W? All of a sudden rich means your're dumping fuel and depending on carb type would suggest a blown power valve or a float problem.Losing your vac advance may also cause it to run fat. Something you can try is to install a set of Rhoads lifters to get your vac pressures up. They bleed off some of the oil in the lifters at idle and pump up as rpm increases. Makes the big lift cams think they are a lot smaller and gives you a milder idle, higher vac but full cam specs when wound up.