Depends what he is slackening. He said 'clamps' i.e. plural, and if this
means the two bolts that secure the clamping plate to the block then this
only gives a few degrees, which is enough to cater for normal servicing
timing changes. If it's the single clamp bolt on the clamping plate itself
then with that slack the distributor should rotate 360 degrees (unless the
vacuum capsule hits anything along the way). If you can get to the two
bolts into the block that is a preferable way of altering the timing than
keep slackening and tightening the clamp bolt, which as you say eventually
damages the body of the distributor through overtightening (which is easy to
do) and then the distributor starts jumping out.
Simple changing of a head shouldn't have changed the timing, but of course
it would affect the valve clearances. There could be a vacuum leak on the
intake side, and the carb settings could have been upset while they were off
especially if they were separated. Could also be a change in compression
ratio with a new head.
PaulH.
----- Original Message -----
> I would think the distributor would rotate at least thirty degrees, if not
> forty-five.
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