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valve

  1. SPI Performance (2000-2004)
    After reading a bunch of really informative threads here, I feel like i need to do something about my 2000 SPI that hasn't dropped a valve seat... yet, and in this economy I want to save some money. Im due for a timing belt change soon and that would be a good time to do something about the...
  2. SVT Performance (2002-2004)
    So I heard porting a valve chamber can increase responsiveness. If so, what would be the best for street? What are the advantages over each other? 1. Full Circle 2. Half Circle: only one side is left stock 3. Stock If I use full circle; I would probably have less worries about the...
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