Lotus began to offer more highly tuned Special Equipment engines as options in their cars. The parts for these engines could also be bought from Lotus Components Ltd. At first, these were Cosworth developed and assembled engines with cast cranks and Cosworth name plates on the cam cover. Duckworth was responsible for the design of the Special Equipment cams. Cosworth later distanced themselves from this business, and Lotus started selling 'BRM' equivalents. "BRM Phase I" consisted of BRM camshafts and high compression cast pistons, and "BRM Phase II" added Mahle forged pistons, BRM forged conrods, small-end bushes and big-end bolts to the Phase I. When offered in assembled form, these engines carried a BRM name plate on a specially cast 'BRM' cam cover, but the actual assembly of these high performance 'BRM' road engines was carried out by Rubery Owen & Co. Ltd., an affiliated company of BRM through its ownership, not by BRM itself. The Special Equipment ('S/E') engines had camshafts developed by Cosworth (CPL1 - Cosworth Production Lotus) with 22/62/62/22 timing and 0.349" lift, called 'L1' cams.