The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

Bowtie67 · 06-10-2005, 08:09 AM

A couple of things,
I have seen multiple holleys with cracked metering bodies leaking fuel and running excessively rich, Power Valve blown or incorect will also cause rich running, they also now have power valve blowout kits available and would higly recomend one of these to anyone running the older holleys, the older holleys all it would take to blowout the power valve was for the engine to backfire back through the carb.

In recent on my truck I had swapped out the cam to something a little bit more radical, prior to the cam swap I didnt notice any real richness but after the new cam it was pretty bad, I decided to try the pure Acetone treatment that someone else had posted a while back because of some minor pinging with 93 octane and octane booster was $10 bucks a bottle. Use 2-3 ounces to 10 gallons of gas, it quit the pinging and I didnt have anywhere near the fuel richness from the exhaust, I also noticed a slight improvement in gas milage. You can buy quarts of pure Acetone at Home Depot for $6

http://pesn.com/2005/03/17/6900069_Acetone/

06-10-2005, 08:09 AM	#19
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	A couple of things, I have seen multiple holleys with cracked metering bodies leaking fuel and running excessively rich, Power Valve blown or incorect will also cause rich running, they also now have power valve blowout kits available and would higly recomend one of these to anyone running the older holleys, the older holleys all it would take to blowout the power valve was for the engine to backfire back through the carb. In recent on my truck I had swapped out the cam to something a little bit more radical, prior to the cam swap I didnt notice any real richness but after the new cam it was pretty bad, I decided to try the pure Acetone treatment that someone else had posted a while back because of some minor pinging with 93 octane and octane booster was $10 bucks a bottle. Use 2-3 ounces to 10 gallons of gas, it quit the pinging and I didnt have anywhere near the fuel richness from the exhaust, I also noticed a slight improvement in gas milage. You can buy quarts of pure Acetone at Home Depot for $6 http://pesn.com/2005/03/17/6900069_Acetone/ __________________ 1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them" Last edited by Bowtie67; 06-10-2005 at 08:10 AM.