Thanks for the info Gents!!... To answer some of the questions..

1) the eng does have a vin stamped by the oil pan.. Ill get the numbers..

2) eng has an HP stamp on it a plus when I bought it, the eng had the original flat top pistons (only RR had these i do believe) .. got it for 500 bucks in 2008...

3) I do have some old pictures of the engine when I originally bought it and opened it up.. and if I remember right the crank did have a few drill holes in it..


so all in all if its a four speed engine... whats the big difference... performance??.. just a little finer balance? or the engine can take higher rpm??