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Lots and lots are available. Note for others: the 330MD probably has a different pump than the 330HD and up; "Velocity Governor" seems to indicate that it gets a smaller oil pump shaft (1/4" hex "car" vs 5/16" hex "HD truck"), IIRC.
391 FT:
-Steel crank with 1 3/4" snout
-4 ring pistons, unsure of spec. Later engines might have used 3 ringers, but heavier than FE pistons
-steel front cover with engine mount
-5/16" oil pump drive
-tach drive/governor equipped distributor with 5/16" oil pump drive
-heads have small intake valves and center exhaust crossover
-manifolds match the heads with center exhaust crossover
-sodium cooled valves
-unsure on cam differences
Lots and lots are available. Note for others: the 330MD probably has a different pump than the 330HD and up; "Velocity Governor" seems to indicate that it gets a smaller oil pump shaft (1/4" hex "car" vs 5/16" hex "HD truck"), IIRC.
Melling M57A is the FT oil pump with 5/16 hex drive
A light foot is a better governor than all that I wasnt planning on using the governor at all just wanted a 390
A light foot is not better but does work on most normal driving conditions IF the driver listens to the engine and pays attention to the tach, that’s something the average steering wheel holder or UHaul renter rarely did
Down in the lower gears working hard is where the governors job was most important, we ran a LT-800 in the log woods with a 391, 5 spd with 4 spd aux trans and 7.17 gears in the tandem axles. With both transmissions in low gear the total gear reduction was over 100:1, 1 mph in vehicle speed was 1000 rpm on the tach, coming up off of soft ground onto hard surface would have engine rpm’s increasing rapidly, without a good working governor the 391’s max recommended 3900 rpm would be exceeded in a matter of seconds
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