Re: 81A heads?
The "Special" heads, usually called Denver heads:
81AS 60-62 CC 8-1
99AS 65-67 CC 7.6-1
19AS 70-72 CC 7.1-1
CC specs and compression ratio computations are from a Canadian service bulletin that covers more heads, both Canadian and USA Ford, than any other I've seen. The ratios above are for 239 engines...they listed a ratio for both 221 and 239 on all the 24 stud heads.
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