Quote:
Originally Posted by cas3
how important is it? i have torn down lots of old motors, and never seen a shim yet! are the new springs that far off?
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Depends on the parts you are using, how deep the value is setting in the seat, etc. I would a least want to know what seat pressure I was running.
The earlier valve spring free height should be around 2.5 inches and the later spring with the rotators should be around 2.2 inches.