Engine Reversal and EFI

[Bill Lewis]

Engines normally have the piston pin bores slightly offset toward the 
thrust side to reduce friction and piston slap.  Running the engine the 
other direction will throw this all out of whack.

Some engines also have oiling systems with the direction of rotation 
taken into account.  For example, something spinning a certain direction 
slings oil off itself and onto something else to be lubricated.

If I'm not mistaken, the 4.3 litre Chevy is a small block V8 chopped 
down.  Often twin engine installations in boats run the engines in 
opposite directions, so you might look into SBC marine setups to see if 
a reverse direction engine is produced, and what they've done to 
support it.

/Bill