i have a new set of piston and cylinders , these were part of a parts stash given to me with a car . They have been stored under a house for awhile . The cylinders have the number 039-101-901-c and came with ali pistons ? any idea of type or size? the pistons just have stamped STD on the top ?

Look like AA Performance, not to be confused with Automobile Atlanta.

A side view and inside view, (of the piston) and piston pin diamenter is essential to make an educated guess. murray

a quick check of aa performance i have found this set which measures close
http://aapistons.com/index.php?main_page=p...;products_id=59