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PAC Racing Valve Spring Seats and Cups
Valve Spring Locator, Inside Locating Shoulder, Chromoly, 1.270 in. O.D., 0.520 in. I.D., 0.060 in. Thick, Each
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Estimated Ship Date: Nov 9, 2026 Would you rather pick it up?
PAC Racing Valve Spring Seats and Cups PAC-S121-16
Not Yet Reviewed
Estimated Ship Date: Dec 31, 2026
Overview
Brand:
Manufacturer's Part Number:
PAC-S121
Part Type:
Product Line:
Summit Racing Part Number:
RSC-PAC-S121
Item Number:
3071364
Locating Shoulder Type:
Inside
Inside Diameter of Inner Spring (in.):
0.640 in.
Locator Thickness (in.):
0.060 in.
Outside Diameter (in.):
1.270 in.
Inside Diameter (in.):
0.520 in.
Locator Material:
Chromoly
Quantity:
Sold individually.
PAC Racing Valve Spring Seats and Cups
PAC Racing valve spring seats and cups are a great way to prevent dancing springs, which would tear up your aluminum heads. High performance racing engines place extreme pressure on the springs. These retainers are essential for use on aluminum heads. They fit the inside or outside diameter of the springs, preventing spring seat movement.
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Some parts are not legal for use in California or other states with similar laws / regulations
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