Why high octane gas rather than octane boost ?
Team Owner
Joined: Jul 2004
Posts: 40,324
Likes: 786
From: Redondo Beach, California
I once bought a L88 short block from GM. I had the piston domes milled off a little to get the stock 12.5:1 compression ratio down to 11.5:. I used the iron rectangular port heads. I mixed 5 gallons of AV gas and 15 gallons of the highest octane pump gas at that time. The engine ran fine. It would not run on straight pump gas without pinging. I started buying AV gas for the car by taking 5 gallon Jerry cans to the airport. Once the people at the airport got to know me, I could drive the car there and they would pump gas directly into the car. For a long trip I would fill the tank with 100% AV gas, and then as I drove and burn, say a 1/4 of a tank off, I would pull into a gas station and top the tank with car gasoline. This way I could go a long way with AV gas enriched gasoline.
Also, even with an L88 like clone engine, with it's L88 cam, and with Hooker headers and a 3.08:1 rear end gear ratio, I got good gas mileage. I could drive the 300 miles from Torrance Ca (new LAX) to Las Vegas on one tank of gasoline.
Also, even with an L88 like clone engine, with it's L88 cam, and with Hooker headers and a 3.08:1 rear end gear ratio, I got good gas mileage. I could drive the 300 miles from Torrance Ca (new LAX) to Las Vegas on one tank of gasoline.
Last edited by 68/70Vette; Dec 18, 2006 at 11:29 PM.
Racer
Joined: Dec 2004
Posts: 410
Likes: 0
From: Wichita Kansas
I've been mixing about 20% 110 leaded racing fuel with pump premium in my 70 LT1. Stops any knocking and the plugs look good. Wonder if anyone else is using this pain in the tank way. I've been told switching to aluminum heads will stop the need for leaded fuel.
Thread Starter
Instructor
Joined: Aug 2004
Posts: 155
Likes: 0
From: SF Bay Area CA
I'm going to have a car with high compression which requires leaded gas, and I'm even thinking to reduce CR with sacrifucing the power.
