Flywheel markings - I can't find PM.5-8 (1980 308 Carb, Single Dizzy)

I've never heard of seized covers. Seized heads, yes, but covers?
Go to 1-4 TDC. Mark the crank shaft pulley to keep track of where it is. It should be pretty easy to keep track of how much you've rotated now. Turn it about 90* and have a good look at the flywheel.

 

Don't have any real information one way or the other, but on the single distributor 308 flywheel there would be no use for a PM 5-8 mark so it wouldn't surprise me if there is no mark for that. Unfortunately, the photos of the single distributor flywheel at MC don't show the area where a PM 5-8 mark would be, if present.

 

Pretty sure it has the mark, even though there would be no use for it. I know my QV has it and yea, it's 90 deg past the PM. 1-4 mark but as noted, why do you care? There's nothing you can do with it.

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One difference is that your QV has two separate advance devices (i.e., two independent Digiplex ECUs) = your car needs a set of advance markings for 1-4 and a different set of advance markings for 5-8 (to make sure both are working OK). A single distributor 308 has only one advance mechanism = only needs one set of advance marks. Just speculating, but your QV having 5-8 marks doesn't convince me that a single distributor 308 MUST have them, too. It might, but I'd prefer seeing a diagram (like you posted) for a single distributor 308 (but have not come across that in the F documentation that I have).

 

Which timing are you checking,
valve timing or ignition timing?

 

If you put it at PM1-4 and confirm you are on the compression stroke, cam marks aligned thru oil fill hole. Pull your #5 spark plug and put a ratchet extension in bore and turn the crank, you will see where the approximate PM5-8 is and you can put a reference mark with a paint pen on your flywheel.

 

Well as noted the PM.5-8 mark is exactly 90 degrees after the PM.1-4 mark so you can easily find that position simply by turning the crank pulley 90 degrees but you still won't have any way of determining your 1-5 bank cam positions without pulling the cover. The QV's do have external marks and pointers that are affixed to the belt covers. They are hard to see and I'm not sure if earlier models even have them. The pointers are actually attached to the backplates and I know earlier 308's did not have backplates on the belt covers.