Re: Cam shaft for 245 CID Six

Posted by Packard Newbie On 2018/8/29 22:58:43

'As long as it's ground properly and to specification, the lift would be identical to the original as it's based on the round side to the top of the lobe. If only the lobe is ground then you're right, the lift would be off but typically the entire surface is ground by the same amount to maintain the lift.'

I have to say I am confused by this description of cam grinding. The tip of the lobe is what wears and instead of being elliptical, the lobe becomes more or less round. the ONLY way to restore original lift is to replace the lost material and regrind to spec. Reducing the round part of the lobe and grinding 'the entire surface by the same amount' to recover the lifting motion of the cam, will definitely make the valve open and close again, but it would be impossible for it to achieve the original lift spec, or the total amount the valve is opened. Am I right, or is there something I'm not understanding???