The D16 is the original. Their SOHC are much better than the DOHC, because the cam is better. I like it because it's a package, and everything will be matched for optimum performance- the cam to the port and polish, valvetrain to take the higher revs, etc. You'll get a lot more out of a Gude package than you will with just a cam and cam gear, for about the same price.
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