Description:

GM 3856874 — Valve Seal Set

Group 0.308 — Valve Stem Oil Seals (Chevrolet Engines)

Your box shows:

GR. 0.308 Valve Seal Set 1#3856874

That is a textbook GM valvetrain service part.

This number belongs to a complete valve‑stem seal set used on Chevrolet engines in the 1960s and early 1970s.

📘 Part Overview

• GM Part Number: 3856874

• Group: 0.308

• Nomenclature: Valve Seal Set

• Contents: Typically 8 seals (one per valve on a V8 intake side, or full set for I6)

• Type: Umbrella‑style or O‑ring style depending on engine family

• Era: Mid‑1960s through early 1970s

🚗 Confirmed Fitment

This seal set was used across multiple Chevrolet engines:

Chevrolet Small‑Block V8

• 283

• 307

• 327

• 350 (early)

Chevrolet Big‑Block V8

• 396

• 402

• 427

• 454 (early)

Chevrolet Inline‑6

• 194

• 230

• 250

• 292

GM used this seal set across:

• Passenger cars

• Light trucks

• Vans

• Industrial engines

It’s a universal GM service kit for umbrella‑style valve stem seals.

🔁 Cross‑References

Common aftermarket equivalents include:

• Sealed Power: ST‑200 / SS‑726

• Fel‑Pro: VS‑series umbrella seals

• Clevite: Valve stem seal kits for early SBC/BBC/I6

Exact interchange depends on whether the engine uses:

• O‑ring + shield

• Umbrella seal

• Positive‑type seal (later engines)