Greg Fletcher
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Acceptable is certainly a word subject to interpetation. The mid to early '70's were heady times at Lotus and Jensen Motors. Both companies did a lot of questionable redo and repair as needed to keep production moving and the different piston sizes are one of them. At the time that was considered an AOK proceedure to occasionally correct some existing problem. The original owner would never had known. If I was rebuilding this engine for 2.2 liter, I'd want to put in a set of oversized JE or CP pistons and bore out the liners to suit. There's a very big difference between what a typical dead-stock 907 engine is off the production line compared to what you can do with it now by rebuilding it with high quality pistons, rings, valves cams, a precision balance and a careful assembly.
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