No, being helical does NOT mean it requires a half tooth piston.
But being ultra torque ups DOES mean that it requires a half tooth piston.
You can get standard torque and one level torque up gears in helical format that can use standard full teeth.
I can get you a Prometheus half tooth piston if you need. Hit me up by PM if you want to jump on a preorder.
Prometheus pistons are made of POM / Delrin, which is a nylon reinforced fiber polymer that stands up to wear a bit better than Polycarbonate does, which is a bit more brittle.
There are very few people who carry stock on half tooth pistons in Canada, so if you can't find one anywhere, a preorder is another option.
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