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I can understand changing the locks (and springs for high lift cams), but why change the retainers if you're not racing?


Something wrong w/them?

Seems like a waste. I think for added insurance, the heads should just come with 10* Comp locks.

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For sure! I couldn't believe when the guy at 440 Source told me I had to change them because my cam was over .510 lift. Are a lot of guys buying aluminum heads and running small cams? Should just come with them standard IMO. So far that is my only complaint. I still don't have the motor assembled so I can't tell you how well they work!