A good friend of mine here in Arkansas has a set of 1972 Big block Buick 455 cylinder heads that Jim Burek Ported and Polished and has the Stage 1 valves installed and the combustion chamber has been cut back to let them breath better. The price is $500.00 firm they are used and they are in good shape. please write back if want to know more and possible phone number. Sincerely Gary McGruther
