I have 2 part number 3916164 GM nos special high performance valve spring that has an outer and inner spring with a damper; was originally used in the 427/454 LS7, ZL1, and L-88 Corvettes. Good for mild performance big blocks
Technical Notes: The dual spring is 1.487\" O.D. diameter and 1.10\" solid height. The pressure at installed height is 116# @ 1.88\" with 317# the average rate of pound per inch. Use with valve spring retainer P/N 3879613.
Rare nos GM valve springs that are getting harder to find! $65 or best offer. Have been sitting a while but in new condition still in the original GM boxes. Call 804)382-9319
with any questions
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