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911nut 911nut is offline
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Join Date: May 2001
Location: Michigan
Posts: 2,511
If you don't have an adjustable WUR, you will need one to fuel the increased mass flow that bigger intake ports will yield.
The only negative will be sluggish low speed performance. If I was going to larger intake ports I would increase the static compression ratio to 8:1 to gain some low speed performance back, then add twin plugs with higher compression ratio to forestall detonation and so the simple engine rebuild snowballs (as does the cost).
Another option would be to have whoever overhauls the heads do a port clean-up, which will improve flow (although not like 36 mm ports will) and re-grind the cam to a 964 profile.
Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 02-06-2010, 04:31 PM
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