Say is there a easy way to test original combo valve?
replaced lines, master, booster, etc don't know if I should trust old one.
anybody know or have part number to order from Chev??
Or does anyone have experience with after market unit (exact fit) etc
thanks in advance 72 el camino

here are the numbers I found. http://www.chevelles.com/forum/ultimatebb.php?ubb=get_topic;f=7;t=007645
As far as I know they still work.

71 350 thanks for that reply the part number is still good from GM 1257177 in fact heres the link
http://www.gmpartsdirect.com/results.cfm

OPPS the link is not working but this is the number (GM) for 72 disc combination valve
my dealer has it for $106.
GM parts direct has it for about $53
thanks again for info