How were these sleds for riding and for speed ?

I think you mean mach 1, I've owned a couple of these sleds and still have one now. they are good dependable sleds,have tons of low end torque,(wheelie monsters)and have no problem with triple diget speeds plus there a descent riding sled. I believe they will be a collecter like the muscle sleds of the 70's

yeah I meant the Mach 1 That's a great looking sled U have there my brother in law is looking for one for next year too drag race on snow thanks

how much hp were those old mach1 670's pushing?

its for sale 1700.00 obo. or looking to trade it towards a mxzx 440 for the kids 320-766-4846 Darrell

Twin piped 670s were about 125 hp. Single piped MXZs and the SS were about 118. The last year single pipe 670 HO had around 128 hp.