I don't seem to recall GM bringing them into Canada. If they did then the #s are low. Given the certification process vs. #s they may have just passed on it. The Typhoon & Sylcone were fast for the day. Real factory engineered muscle trucks. Turbocharged Chevy 4.3 (262) V6, basically a 350 V8 minus 2 cylinders.

Only the Chevy 454SS made it to Canada AFAIK. I remember them new on the lots. We didn't get the S10 Cameo either, but that was just a subtle body kit with nothing else exceptional.

I met one of the guys who helped develop the GMC Sylcone & Typhoon when he worked for GM. Dan LaGrou has been running D & D Fabrication in Michigan with his son Mark, who worked for SLP for quite a while. They started out with V8 Vega swaps as a side in 1973. They are THE go-to guys for anything Buick-Olds-Rover aluminum V8. He had several hundred cores when I visited. He even had a mini museum  with prototype Chaparral engines, ancient pics of him drag racing a '53 6-cylinder Corvette running in C/altered. It ran 9.10 et at 143 through the traps on 9" tires...