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Valve Spring Height
Hi guys yes I have searched and cannot find. Question is I am having my heads rebuilt right now 3.0L Euro SC have reground cams to 964 profile therefore what height should valve springs be set at?
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Davy 82 911 SC Targa Sold 12 Audi A5 Sportback 3.0 TDI Quattro 03 996 C4S |
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08-11-2010, 10:03 PM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Hi Davy,
That information is in both the Porsche spec books and the factory shop manuals.  34.5mm for all. I sure hope the people doing your heads have access to this data so they get everything in your heads correctly. Seat dimensions, guide installation procedures, and clearances are all rather critical to assure any kind of longevity.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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08-12-2010, 08:06 AM
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Location: Atlanta
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Yes, make sure your machine shop knows what they are doing! I literally just had a machine shop come highly recommended that completely botched a set of heads. Didn't even bother checking installed spring heights with the new valves. Catastrophic foolishness.
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08-13-2010, 09:15 AM
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34.5mm for stock springs, if they are using different springs then it is possible there is a prescribed height from the manufacturer.
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS |
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08-13-2010, 03:47 PM
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Misty
Stella
