Part
Number

Description

Pressure at Outside Diameter

Installed
Height

Solid
Height

Average Rate Pounds per inch

Retainer Part Number

Valve SealKit

Notes

3911068

Single w/ damper

1.241"

80# @ 1.70"

1.15"

267

14003715

10132715

Production spring used with special high-performance 350ci, 300 HP (SP) engine.

3927142

Single w/ damper

1.273"

110# @ 1.70"

1.16

358

14003974

10132715

Use with camshaft #3927140 and all high-performance production cams to extend rpm range

10134358

Single w/ damper

1.273"

110# @ 1.70"

1.16"

356

14003974

10132715

Chrome silicon steel; used with 10185086 aluminum head assembly. Orange color code.

330585

Dual

1.379"

140# @ 1.75"

1.15"

325

330586

10132715

Use with camshaft #3927140, 3965754 and all moderate lift racing cams.

366282

Dual w/ damper

1.525"

128# @ 1.70"

1.26"

406

366254

After-market

Use with high-lift mushroom or roller tappet racing cams (.625" lift).

10206040

Single spring

1.30"

85# @ 1.78"

1.26"

373

10168424

NA

1962-93 LT1 production Corvette engine.

12551483

single spring

1.32"

101# @ 1.78"

1.22"

332

10212808

NA

1996 LT4 Corvette and ZZ4 engines.