i have a question on my stamp pad.
reads as follows: F440
C (is upsidedown)
7 30 HP2

i have found all kinds of letters and symbols telling about over or undersizing on internal parts. but nothing talks about the C. i have looked it over closely and seems to be a clear solid stamp. another quick question. on my engine block casting 2536430 5. what does the 5 mean?

 

This should answer, it actually has your number down the page.

http://www.440source.com/partnumberinfo.htm

http://www.440source.com/blockinfo.htm

 

i cant seem to find anything about the upsidedown c. any ideas