[Tom Vaught]

Quote from an carb website: "In David Vizard's latest book on Holley, he writes about a gas mileage test he did with a SBC. His conclusion was (paraphrased): the worst mileage came from an unheated or only heat soaked manifold, better was the exhaust heated (but robbed 10 to 12 hp), and best gas mileage was achieved with a coolant-heated intake that held the manifold temperature to between 180* and 190* at a cost of only about 5 hp. This was accomplished by blocking the ports of the crossover and plumbing coolant through it from the radiator."

So Vizard thinks that it works ok.

TV

[72LuxuryLeMansLa.]

Originally Posted by Tom Vaught

Quote from an carb website: "In David Vizard's latest book on Holley, he writes about a gas mileage test he did with a SBC. His conclusion was (paraphrased): the worst mileage came from an unheated or only heat soaked manifold, better was the exhaust heated (but robbed 10 to 12 hp), and best gas mileage was achieved with a coolant-heated intake that held the manifold temperature to between 180* and 190* at a cost of only about 5 hp. This was accomplished by blocking the ports of the crossover and plumbing coolant through it from the radiator."

So Vizard thinks that it works ok.

TV

Tom,
What was the mileage gained with the heat?