The first two digits tell you the year. The letter tells the decade, the number tells the year in the decade.

C = 60's
D = 70's
E = 80's

etc...

C1 = 1961, but there were no 302's made then, so it must be a D1, or 1971 block.

Good Luck!

______________________________________
66 mustang
302 4-speed 289 heads, 10.63 @ 129.3
[url]http://www.mustangworks.com/cgi-bin/moi-display.cgi?220[/url]
[img]http://webpages.charter.net/hotrods/stang2.jpg[/img]
[img]http://webpages.charter.net/hotrods/stang3.jpg[/img]