| Hi
I was planing on converting my 748sps engine to a 853,in the end i went with a 955 engine.I collected everything apart from the 853 kit,i sold the engine to Baines Racing at Silverstone,as far as i know they still have it,might get your cams there.I still have a set of heads with bigger valves overhauled with new valaves and shimmed ready to go,i also have a set of light weight adjustable cam pulleys.
During my research into converting the 748 i was advised to fit a oil cooler as the 853 engine can run a little hot,i might have a oil cooler to.
Cheers
Colin Ridgway | 
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