Timing an E Cam
I am about to time the cams on my 911, I have E cams, a 70.4 crank, and S P/C's. I noticed that the E cams from 69-71 have a valve overlap of 3.15 and the 72-73 have an overlap of 2.9. Can anyone please explain why the difference, isn't an E cam an E cam regardless of year? What would you advise for my engine. Thanks for the help.
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