[ls1ac]

I have been using a Whipple on a 454 in a suburban for a tow truck for the last 9 years. Started with about 9.75/1 and about 6in at max. It could spin all four wheels on startup; my son took it to the drag strip and could better many 5lt.mustangs. After about 120,000 miles I was hauling a racecar back to Wi from Or and got some bad gas in Wy. It needed 93 to run wide open and even with the additives to the gas in Wy (when I heard the ping), It put a piston on its side. I rebuilt the engine at 9.00/1 and have been going for an other 80,000 miles. I had hoped to go to 7in of boost but could not get the pulley small enough and keep the belt alive.
The Whipple is unusual in that it is after the throttle body on top of the intake. This means that when running easy there is a high vacuum before the screw with a TBI, this gives better mix and gas mileage, if you can keep your right foot from “falling” to the floor. The other nice feature is that the parasitic’s are less than a roots while near open throttle.