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spuggy spuggy is offline
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Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 2,744
There's much more info - esp. regarding porting, sometimes in conjunction with EFI - spread over many, many other threads.

However, these two threads are worth a read regarding the two specific questions you asked - port sizing and the composition and characteristics of the alloy used in the 930, 935 and all 993 heads:

head for a turbo
Truth or Rumor: 930 vs. 3.2 heads
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'77 S with '78 930 power and a few other things.
Old 12-25-2007, 11:25 AM
  Pelican Parts Technical Article Directory    Reply With Quote #7 (permalink)