VP produces high octane, “lead” free gasoline if it is required by the various low compression engines.
I have had to add various amounts of VP C12 108 octane leaded “racing fuel” gasoline to my fuel tanks since the 1970s. I added it until the detonation stopped, usually about five gallons per 20 gallon tank of 92 octane pump gas. The exception was my 1963 Pontiac Catalina with a 455 CI engine. It required 100% VP C12 108 octane leaded “racing” fuel. It had a flat tappet camshaft and 130/310 lb valve springs, 9770716 heads with 69 cc combustion chambers, flat top Sealed Power pistons with 12:1 compression ratio.
I now have a 1962 Chevrolet Bel Air with 10.3:1 compression ratio and a 3863151 (L79) camshaft. I add about five gallons of VP C12 to fifteen gallons of no-lead premium EXXON just to eliminate the possibility of detonation on the pump gas. I have heard detonation without the VP fuel. The valve springs are GM 3911068 (Z28) set up by the original owner in 1968 set up with 80/270 lb seat/open spring pressure. Those springs have lost about 10 -12 lbs since 1968. I can shift the original Borg Warner T-10 at 5,500 RPM with the 4.11 gears without valve float and the transmission still has the original “wiggle stick” shifter.
My 1962 Chevrolet Bel Air has a 1968 350 CI motor with about 60,000 miles on it, uses about 1/2 quart of Valvoline 10w30 between 3,000 to 4,000 mile changes. I did a 14.80 ET in street trim at The Texas Motorplex about a year ago.
Last edited by MouseFink; 07-13-2019 at 11:17 AM.