View single post by Jensen Healey
 Posted: 01-05-2013 05:46 pm
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Jensen Healey



Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
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 The upgrade to the lip seal occurred in 1973 while the older square corner headlight surrounds and two piece wings were still in production.

One problem with upgrading the 907 crank is flexing in the main bearing area. There were countless upgrades throughout the 25 year life of the 900 series engines but Lotus never stroked the crank past 2.2 liters. I wonder why?