Opinions on valve keepers..... (poll)

brian6pac said

I've also heard from many races not to run 10* locks because there is not enough taper to lock it in the retainer and they bounce out at high RPM

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I think you have that reversed. The 10 degree locks have more taper
Than a 7 or 8 degree to better lock. Almost all race style retainers are 10 degree. But a couple years ago Ryan Johnson showed me a nascar super 7 but it very much looked like a 10 in the way it spread out over the retainer. The ford engine that I mentioned blew up had 8 degree retainers. Pulled through reving up in the driveway.