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Restored d17 project
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21851 		Post Options Post Options   Thanks (1) Thanks(1)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 8 minutes ago at 11:06am
Not necessarily. But if the cam timing to the crank was off, it probably wouldn't ever run regardless of where the ignition timing was. Late camshaft timing would result in the exhaust valves getting smacked when the piston was coming up and the exhaust valves aren't yet closed.  This catastrophic failure of the valve train can only be from incorrect valve guide height. The cam/crank timing was correct. How could 8 valves be stuck in their guides?? very doubtful.
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Les Kerf View Drop Down
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Joined: 08 May 2020
Location: Idaho
Points: 1262 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 3 minutes ago at 11:11am
Originally posted by 55allis 55allis wrote:

I was meaning if the cam time was off the distributor could be off too…

With the head off you can easily verify the cam timing without a degree wheel simply by putting the #1 piston at TDC, then look at the cam lobes. At the tail end of the exhaust stroke both lobes will be upward with the overlap split because the exhaust will be just closing and the intake will be just beginning to open.

If the cam timing is off enough to matter then it will be obvious to the naked eye.

This is probably not where the problem lies with this engine, but it is so easy to check that it is worth doing just so that you know it is correct.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8613 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 13 hours 37 minutes ago at 12:37pm
If the guides and caps aren't interfering and cam timing looks correct and guides weren't stuck about all that's left is rocker adjustment. So wait a minute...tall heads use short stands,short heads use tall stands...do we have short head short stands?
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