Double stack Mack Posted March 15, 2014 Share Posted March 15, 2014 Anybody out there know if I put 4 valve heads on 2 valve block do I have to change cams or is the 2 valve cam same as the 4 ? Quote Link to comment https://www.bigmacktrucks.com/topic/35045-cam-shaft/ Share on other sites More sharing options...
br549 Posted March 15, 2014 Share Posted March 15, 2014 Camshaft are different, also the older 2 valve used a different camshaft bushing in the block. Seems like some of the newer 2 valve used the same rear cam bearing and a lot of the reman engines. The old style used a thick rear cam bushing for a smaller journal, later they made the journal all the same Quote Link to comment https://www.bigmacktrucks.com/topic/35045-cam-shaft/#findComment-237418 Share on other sites More sharing options...
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