Product Information

For valve springs that require the LS1 seats to be use, a non stock valve stem seal is required.  There are 2 versions available, for .520" and .553" OD valve guides.  .520" use the orange seal stock while the .553" use a blue seal stock.  Generally all 3400 are .553" and 99 and older 3100 are .520".  All 3500 heads have .553" OD guides.

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Price: $24.99

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