Posted by Mark-Mi on January 31, 2011 at 20:37:33 from (97.107.84.156):
In Reply to: F-600/391? 4Vor 2 V ? posted by j hitkemper on January 31, 2011 at 19:40:53:
I would rebuild the 4 barrel. There not hard to do. Gas mileage shouldn't be worse unless you are into it hard causing vacuum secondaries to open. May be better if the primaries are smaller. It's a matched set, heads ,ports, intake, carb.I would not mix an match parts. Past owner of F-750 tandem 20 foot box. That 391 needed every horse she could muster. Mark
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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