I see they have the 906 listed at 79.5 cc also .... WRONG , that's the NHRA min spec , I have yet to see a 906 below 90cc that hasn't been cut . measure the casting at the outside row of bolts under the exh manifold mounting surface , they are typically 1.000 , if it's less that will give you an IDEA how much the head has been cut , if at all .
