Quote:
Originally Posted by creative sewer
I think I'm on the right track. In stock form before taking the cams out this what I got: #1 cyl Intake 120, #1 Exhaust 110, (#1, #3, #5, #7 should all be identical )#6 Intake 113, #6 Exhaust 118 (#2, #4, #6, #8 should all be identical). I tried to verify this by puting the cam pins in the holes at 51 Degrees. One cam pin went in at 46 Deg, one at 51 Deg, one at 55 Deg and one at 60 Deg. There is some slack which can make up some difference but it's a sign nothing is in sink? Can motors run fairley well when the cam timing is that far off? (this one did?)
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Marc Haibeck suggests there is about 3 deg of play (6 deg measured at the crankshaft) between the sprocket timing plate flat (vernier plate) and camshaft flat (90'-92').
That means after you have pinned the camshaft, the crankshaft can move 6 deg due to the play in the venier plate as you tighten the camshaft bolt.
When you dropped the pins as cited above it is assuming the slack was out of the timing chain (using the manual chain tensioners) as you rotated the crankshaft (equally for all four cams) as you noted your crankshaft degrees.
Having pins drop in at 46 deg and 51 deg on one bank and 55 deg and 60 deg on the other bank would not be so unusual depending on how you made sure the timing chain slack was accounted for (It does sound a bit sloppy original timing on each individual bank). Also as I recall, one bank tends to stretch or wear a bit more than the other bank in regard to camshaft timing (I forget the reason)
It might be hard to tell change in performance unless someone else drove your Z as you have become used to its performance at that camshaft timing (unless of course you put it on a Dyno).