I'd like to locate a specialist who prepares 603 motors for more power. Just a good old overbore is what I mainly would like. The power curve and driveability are perfect, I just want more. I can speak some German, so a shop in Germany would be fine.

No, I don't want to go to the turbo because they are rare here in France where I'm living for a while. I don't need head cooling problems either.

Regarding those head cooling problems, has anyone tried just changing the gearing on the water pump drive, so it turns 10% faster? A slightly smaller pully on the water pump should help.

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Thx/Reno
An American in France
88 300TD 5spd Sportline (lowered factory susp) - totalled by a flying deer
89 Range Rover V8 - the 4wd beast
02 Toyota minivan
05 Peugeot Partner 4x4 Dangel
88 International Harvestor 633SA
--Gone but not forgotten:
1970 250/8 C (sold to buy 450 SLC)
1972 450 SLC (sold after battling wiring harness problems too long)
1971 300 SEL 6.3 (sold after destroying two *very* expensive rear LS diffs)
1986 560 SEL (now my little brother's pride and joy)