ive read a lot of ugly stories about them on h-t.. i think you'd do well to aviod them. and any company that claims 10% hp increase on any motor from just a single pulley change cannot be legit.
well i tryed to get in touch with dh-racing a few days ago they have yet to return my calls.. after reading this post ill stick with port flow for my head work.. i am already runnign there valve springs and retainers
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