3200 pound car, 9.60's in quarters, 6.18 or so in eighth, 7500 rpm shift, lotsa torque, well over 700 passes on 440 source stroker kit. been rebuilt once. use other manufacturers parts for valve train stuff, dampner, rings, bearings, etc. etc. Recommend them?? Yes, take with a grain of salt!!......I have indy heads etc. but I would not hesitate a minute to buy a set of BARE stealth heads if I needed them. Source has helped to hold down prices on mopar related products, EVEN for those that "hate"!!