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LS3/L92 valve stem dia.

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Old 04-19-2009, 07:49 PM
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Question LS3/L92 valve stem dia.

Does anyone know what the stock In and Ex valve stem diameter is?

The specs I've found are conflicting:

Car Craft L92 head article states 8mm (0.315-in)

The online Manley catalog lists them as:

0.3133-in (7.958 mm) In.
0.3136-in (7.965 mm) Ex.

Are these discrepancies within acceptable tolenances?

Car I safely install a 5/16-in (7.9375 mm) stem valve in my L92 heads?
Old 04-20-2009, 08:42 AM
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Originally Posted by Hans Grüber
Does anyone know what the stock In and Ex valve stem diameter is?

The specs I've found are conflicting:

Car Craft L92 head article states 8mm (0.315-in)

The online Manley catalog lists them as:

0.3133-in (7.958 mm) In.
0.3136-in (7.965 mm) Ex.

Are these discrepancies within acceptable tolenances?

Car I safely install a 5/16-in (7.9375 mm) stem valve in my L92 heads?

I just used the 5/16" seals from Comp.

Robin



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