Cast Iron GT40 heads

they do come with a warranty i think. mine were in great shape when i got them and i used those heads, a b cam, 1.7 rockers, and a trickflow street heat, with stock fuel pump, clutch, injecotrs, maf, tb and ran a 12.8@106mph untuned with no idea what fuel pressure is or timing. so they defientely put out power