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valve spring hight when using 964 cams?

Hi, I'm asking what the correct valve spring hight should be when using 964 cams in a 911 turbo head?
I searched and could not find it.
thanks in advance.

Old 03-16-2014, 06:16 AM
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Originally Posted by JFairman View Post
Hi, I'm asking what the correct valve spring hight should be when using 964 cams in a 911 turbo head?
I searched and could not find it.
thanks in advance.
Per Bruce Anderson, 34.5 mm for intake and exhaust. In the following sentence, he then states it should be 34.5 mm for intake and 33.5 mm for exhaust.
I would set both to 34.5 mm, just like the recommendation for SC cams.

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'91 964 3.3 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, H&R Coilovers, ESB spring plates- 210 lb

Last edited by 911nut; 03-16-2014 at 08:07 AM..
Old 03-16-2014, 08:02 AM
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