pffft. (the sound of a can of worms opening) B)
this is just the tip of the iceberg.
kdf - 1938 to 1947
split window - 1948 to late 1952
zwitter (oval with split rear window) late 1952 to early 1953
oval window - mid 1953 to august 1957
little big window - august 1957 to 1964
big window - 1964 up
super beetle - started in 1971
6 volt system up to 1966
12 volt system in 1967 and after
engine size varies from 1100cc (early) to 1600cc (late). allthough you can build them as big as you need. alot of guys on this forum run anything from a 1835cc to a 2332cc.
bentley manuals are reprints of og vw service manuals. they are THE manuals to have.
john muirs \"idiot's guide to keeping your vw alive\" is a good, simple read.
hot vw's put out a special edition \"how to\" book not to long ago. i cant remember the exact name of it.
\"how to hot rod your vw engine\" by bill fisher is a good book.
\"california look vw\" by keith seume is the cal-look history \"bible\".
check out the forums and galleries at
http://www.thesamba.com/vw/ and start reading and looking at pictures and take note of different year beetles.
http://www.cal-look.com/ is another good site.