Talk about a dishonest seller. I purchased a set of ported iron heads form him, that were checked to be good by a shop. When I strted taking them apart for inspectin, one exhaust valve was frozen into the guide and the seat of the valve was wasted too. But these were checked to be good heads! Failed to tell me they were on a car that blew its head gasket less than a year after installing, oh yeah these are grooved for loc-wire 1007's. So after 600+ bucks Ive got to send them out have the seats done a new valve replaced and the guide too. I wasted my money on CRAP.