Quote:
Originally Posted by Choon
anyway, hi cam will exert more stress to your valves because of the more sharp curvature on the cam profile, which might shorten the life of the stock valves.. correct, sifu sekalian?
and now gasoline price went up ad, dun use high cam lo.. use more fuel oni.. haha 
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nope... valves are not wear n tear item... sharp curvature of the cam lobe means higher lift on valves to allow more air/fuel to go thru....
camshaft with high lift recommended to upgrade stiffer valve spring... stiffer valve spring allows valve to go up and down fast and precise so ur piston wont hit ur valve...