My experience with Jim Rowe at Metric Mechanic has been absolutely great. He's well informed and willing to share his knowledge with anyone. Just call him. Gosh, he answers the phone most of the time and always has time to talk about motors and transmissions. Personally, I have a Metric Mechanic 3900 Hi-Flo Sport motor. Mine is built on an M crank with a 95mm bore and a 90mm stroke. I've also got the 12 lb. flywheel and his Ultimate Transmission. Couple all that to his System 300 exhaust and 50mm euro downpipes, and a cold air intake box. Likely 300 hp, or thereabouts. Smoth idle, monstorous torque and hits redline in a jiffy. So far, I've seen 142 mph as I shifted out of 4th gear at redline. What else can I say. I'm completely pleased.