m96/70s64220847.i know the m96 70s bit but,can anyone shed light on the numbers after the letters please

 

got it
the MXX.XX number is the porsche engine code. it groups by basic design so all turbos and GT2 use the same basic engine, Mk1 Gt3 has a different basic engine from the Mk2 GT3 and RS etc.
as for the three digit code, its part of the engine number as is read as follows.......
first digit: engine type. 6 = 6 cyl engine
second digit: engine version
third digit: model year. Y=00, 1=01, 2=02 etc
this is followed by five digits which show the actual number of the engine. the range is covered in your table. ie 00501 >60000

as such there wasnt four different engines for the pre facelift (or whatever you call it) GT2.

 

thank you