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Old 05-15-2010, 09:43 AM
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large valve stem diameter

I recently ran across an sbc with unusually large valve stems, in fact they measure 0.456". Has anyone ever seen valve stems this large? Attached is a photo of the assembly, the roller tip on the rocker is 0.368" and as you can see, it is larger than the stem. Heads are old brodix -8, spring installed height is 2 1/8", spring diameter is 1.560". They were measured with dial calipers, not a micrometer because they are still assembled so give or take .001" or 2 on the stem diameter. Anyone seen this before?
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Old 05-15-2010, 10:41 AM
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That is a "lash cap" a hardened cap that sets over the valve stem. The valve locks are relieved to clear the cap. These are commonly used on high lift drag race type assemblies.
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Old 05-15-2010, 03:08 PM
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Like Bob has said, your heads are equipped with lash caps, which are hardened pieces that sit on the valve stem like a bottle cap on a beer bottle. Common racing stuff to either/and/or protect the valve tip, add surface area for the roller tip , or height to keep the rocker body from touching the spring retainer.
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