Product Information

.522" ID 1.171" OD, for use with all LS based valve springs such as the yellow stock LS6 springs and the Comp 26915.  1999 and older 3100 engines should already have the guides machined to accept this size seat.  If your vehicle calls for the Felpro SS72851 valve stem seal set, these seats drop on.  Otherwise some work to the ID will need to be done to fit the .553" OD of the 3400 and 3500 valve guides. 

2.8 and 3.1 MPFI motors have the same .553" OD on the guides and require the ID on these to be modified as well.

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Price: $34.99

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