V6 3100 valve springs

[rseibenick]

Looking for Gm or aftermarket original conical design stock pressure valve springs. The only thing I found so far is the new replacement GM # 10166343 and VS1642 Federal Mogul springs. Both have too wide a base and too much pressure for the application I need them for. The original Conical 3100 valve spring , which have 1 new one only , has a smaller bottom and the right spring pressure. Any leads or ideas. Thanks.

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[SappySE107]

New springs only or low mileage 3500 springs (same spec) work as well?

[rseibenick]

The new original spring and used ones I tested had less pressure then the springs listed above. Also the bottom was about 1.250 wide and the springs above are 1.350 which is too big for my application , which is a Gm 2.3 quad 4, 16 valve engine. The springs listed above have 72 lbs at 1.700 and the old original conical 3100 springs tested had less pressure. If I could find a aftermarket manufacture that had a lising by OD and ID and spring pressure , I may be able to find a conical or beehive spring that would fit my need. Are the 3500 conical valve springs.