Greg Fletcher
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Yes, you will need to do some machine work to do a proper upgrade on a Jensen Healey head. The larger intake and exhaust valves need to be fitted to the head and the head will need to be reamed for the oversized guides. This is not a big deal for a competent machine shop. If you want a performance head, you should get some porting done. Richard at West Coast Racing Heads in Reseda, California is an expert on the JH head and can do whatever you want dependent on how much you want to spend. The later Lotus Zeus head with water cooled exhaust guides would be the ultimate upgrade over the original head. Garry Kemp in the UK could probably set you up with one that has Nibron valve inserts and Colsibro guides, which is what Garry says they run in F1. It's very trick, but the price for a state-of-the-art head on a Lotus engine is pretty steep.
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