need info on head work

Yamaha Raptor 350 & Warrior Forum

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The lobe profiles may look similar on those 2 camshafts numbers wise, the ramp rate is why Web recommends a higher tension spring. The valve opens & closes differently & the way that the Web cam sits the valve back on the seat is more radical, thus needing more spring to control the valve.
 
I have two good factory cams. 1 with bearing 1 without. The 1 with bearing is still in the head, and has only been sitting for the last 3 weeks. I'll pull the cam out if you're interested. I'd sell you the whole head, but I plan to do a 400 bigbore or stroker in the near future.
 
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