Sto approfondendo il discorso sulla pompa short o long....è un po' un casino poichè sono state fatte diverse versioni e poi cambiando sia pompa che pulegge è difficile mantenere l'allineamento (vabbè che ci sono gli shim...
Starting in 1969, with the sole exception of the Corvette, the pumps were changed to a "long leg" design--Corvettes used the short leg water pump through the end of 1970. The '71-82 (the latest for which we have reference data) Corvettes used a shorter long-leg pump than other small-blocks.
http://www.vetteweb.com/tech/0207vet...ioning_system/
The short water-pump GM reference height from the block mounting flange to the pulley mounting flange is 5-5/8 inches. The long water-pump reference height is 7 inches. To make this even more confusing, Chevy also used late-model serpentine-belt short water pumps, but these use a 5-13/16-inch (5.8125-inch) reference height for ’84-’92 Corvettes. There is actually yet another reverse-rotation water pump used in serpentine-belt applications for ’87-’94 small-blocks and 90-degree 4.3L V-6 engines that uses a 6-15/16-inch reference height. Whew!
http://www.chevyhiperformance.com/te...leys_brackets/