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Tappet talk

Subject: Tappet talk
Date: Fri, 6 Jan 2006 14:35:44 EST
GOOD tappets will have a very large radius ground on the base,  the amount 
(measured in FEET!) as determined by the grinder, & there will be  a nice edge 
break or slight chamfer around the edge of the base as well. The  lobe is also 
ground in at a very slight angle in order to promote rotation of  the tappet. 
If it doesn't turn, it won't live.
BTW the tappet base/cam lobe interface is the highest loaded point in an  
engine. I've read figures quoted as being as high as 250,000-300,000 psi unit  
Many engine building/tuning books cover this issue.
Hope this helps'

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