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914 Geek
Join Date: Dec 1969
Location: Silly-Con Valley
Posts: 14,946
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The threaded holes in the 73+ rocker arms are too large for the 911 adjusters. 74 rocker arms will not work. You need the 70-72 rocker arms.
...It is possible that 73 1.7 rocker arms might work, but I'm not certain about when the 1.7 changed to the later-style rockers.
--DD
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