Don't believe all the old world internet claims of the CC of all these heads, they are not exactly 72 cc My 1968 #16 heads are actually 77 CC I have these on my +.030 455 with a 24cc dished piston to give me exactly 9.4:1 compression. Even if you have to completely do a set of factory Pontiac heads with valve job,guides, new valves and springs....etc you are still saving $1000 over the cost of buying new aluminium heads. People always forget to add in the extra cost of the required head bolts and new push rods and other little goodies when they buy aftermarket heads.
