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I run a Torker II on my 521 and like it. You can run a 14" air cleaner as mentioned if you use a 1" drop base.
Regarding solid roller cams, I had several failures even after diligently checking the the valves every 250-500 miles. The rollers kept breaking off every 1,000-2,000 miles.
I finally switched to a hyd. flat setup and it's got for like 15,000 miles no prob. There are some pretty big hyd. cams out there if you want one...
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Last edited by cdog; 04-18-2013 at 09:10 PM..
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