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Old 11-05-2018, 08:36 AM   #10
maytag
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Join Date: Mar 2018
Location: Utah
Posts: 2,446
Quote:
Originally Posted by JFP in PA View Post
Rotating the engine in reverse, even by hand, is sufficient to whack the valves; we have had people bring us cars that they had done exactly that while attempting an IMS retrofit, and even though the cams were still in time, they had kinked a couple of valves and every piston had bark marks from contact.
!!!??!!!

I believe you, JFP, because I have no experience otherwise. But I'm struggling to wrap my head around the HOW.

The location of the cam (and therefore the entire valvetrain) is fixed, in relationship to the crank (and therefore the pistons). I'm trying to imagine how direction of rotation can affect this? Teach me.


Quote:
Originally Posted by MaxD View Post
In the end this was an atypical AOS failure. We have all seen smoke, exhaust oil fire not so much.
Hahahaha.... I'm rarely "typical" in anything, Max. Surely you've understood that about me by now, haha.
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