well to start with my heads were done by the not so famous BJR Racing in Georgia. first he told me i needed to replace my springs because they didn't have enough seat pressure..he said the had 160 pnds.... so i bought new springs 240 pnds on the seat almost $300. but if he would have checked the spring pressure with the retainers on he would have seen that they were 202pnd not 160... and then Mr hightech does a race valve job with some bull**** stones from 1970 and the valves were not even seating all the way around the seat which really pissed me off .. so what i want is for someone to explain to me how the hell the heads flow what he says if he cant even do a damn valve job right... then he didnt even wash the damn thins before putting them back together... hell he even glass beaded my valve stems.. so what i am saying is that it is pure bull**** work and for those of you who are thinkin of sending your stuff to him i wouldn't but its your choice. Just had to tell oyu guys what happened...so if you are listening mbeck.....mikesduster beware!