Re: Proper gas for 374 engine
Posted by Jack Vines On 2011/2/24 14:56:33
Quote:
The seat, under prolonged hot driving, is what suffers damage.
FWIW, I sometimes see severe wear on both the seat and the exhaust valve mating face. Studebaker V8 exhaust valves wear more than Packard V8s. It is probably the Packard script on the valve head which protects it to a small degree.
FWIW, retarded ignition timing, such as when a distributor vacuum advance canister diaphragm is perished, will cause elevated exhaust temperatures at high speed cruise.
jack vines
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