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What is it that you need to do to the existing head? Did you break a timing belt?
As far as I know, the difficulty (both technical and $) of installing an S head into an NA is not even approachable in terms of the performance gains you will realize...very small gains, very difficult modification. I think the S head has different water jacket ports or something like that.
As far as doing your own water pump and belts, it's not very difficult, check out clarks-garage.com for some great tutorials. Doing your own clucth on the otehr hand......
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Grant
In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 1995 Toyota Land Cruiser, 2011 Pursuit 315 OS, 2022 Tesla Y
Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S
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