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I have a set of 18 degree heads and a two piece intake, Titanium exhaust and intake valves , Shaft Rockers, They were on a 421 Chevy engine. Originally Done by Joe Gibbs Racing, It is stamped on the heads, They were fresh and ran 13 times before breaking engine. I will have them freshen or sell as is, They could possibly have some bent valves, I cant guarantee they don't, $ 2,500 as is Or $ 3,000 Freshen, Peoria Il 309-370-5639