never thought about this but whatz the difference?..Does the W have port injection?
Went out and looked in the Haynes manual and it mentions a CPI system which seems to be a cross between a TBI system and individual injectors.....more HP?
The Z is a TBI, it has 2 injectors and the setup looks like an electronic carb. Has a round air filter on top of the engine with a horizontal throttle plate. The W motor, also called the CPI or Vortec, has a filter box in front of the oil filter in the engine bay, behind the driver's headlight. There are 6 injectors on the V-6, but they all fire at once. I believe there's a different cam in each motor, plus the injection setup, accounting for the extra HP. Oh yeah, the W engine has a vertical throttle plate, it sits in front of an intake plenum that looks like a black spider.
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