Does anyone have experience with the summit brand of vortec style heads. For the complete pair minus the valve covers they are $650. The price is very tempting if they are the same thing.

http://store.summitracing.com/default.asp?Ntt=summit+haeds&x=0&y=0&Ntk=KeywordSearch&DDS=1&searchinresults=false&N=115&target=egnsearch.asp

I bought the real deal from Salle Chev. for $550.00 for the set.