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porting

  1. Street porting a 1.9 big valve head

    Opel Engine Performance Modifications
    I've had a lot of requests to share information about porting a 1.9 head for street use. Here's a pictoral on doing it yourself. This is not an end-all method by any means, it is simply a safe way to port a 1.9 head to improve performance rather than hurt it. This particular head is a 1971 1.9...
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