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Craig 930 RS Craig 930 RS is offline
Me like track days
Craig 930 RS's Avatar
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,196
Hello to everyone, been out of town for a bit -

Your best bet are the 78/79 big port heads. Why?
Why would I want big ports on a 930 when the tiny ports work so well on an early turbo?
Why would I want to forego the toough 930 alloy for the aluminum SC heads?

Modern turbochargers rely more on good ol' volume than velocity.
Turbocharger design as well as efficiency has greatly changed over the years, and, with everything else optimized, larger port SC heads make about a 15-20 HP difference.

SC heads only offer a theoretical disadvantage over the tougher alloy 930 heads. Time has proven that there is zero problems with SC - or for that matter - Carrera heads. Structurally and functionally they look like new at rebuild time, ask me how I know -

For me it just makes easy sense to sell the 930 heads at rebuild time, buy SC heads and rebuild those.
You are out virtually no additional moneys, and get additional performance for no additional dollar outlay.
- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 07-25-2008, 07:44 PM
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