I purchased a compleat topend package out of haleyvill alabama it was a new set of SC1 yates heads loaded, cp pistons ti rods, cam,manifold and carby.i paid more tha 8 k for the heads, waited 12 months after i had paid them for the stuff, i made 156 phone calls from the australia to the USA to get the shit!then when i went to torque the rocker gear I got to 35 lbs on a 7/16 bolt and striped the alloy .I puled the heads and they were soft!!! both of them!even the head bolt bosses had squashed it cost me $2800 aust to strip all the seats and re heat treat the heads.SO tell me we don't get the shit!