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1968 - 1982 Corvette Specification Guide
(1968-1982 Exhaust Manifold Casting Numbers)

 

1968 Exhaust Manifold Casting Numbers

Left-Hand Right-Hand Application
3872765 3872778 All 327 Engines
3880827 3880828 All 427 Engines

1969 Exhaust Manifold Casting Numbers

Left-Hand Right-Hand Application
3872765 3932461 All 350 Engines
3880827 3880828 All 427 Engines

1970 Exhaust Manifold Casting Numbers

Left-Hand Right-Hand Application
3846559

3932465

Early 300 & 350 Horsepower Engines  

3846559

3989036

Late 300 & 350 Horsepower Engines  

3872765

3932461

370 Horsepower LT1 350 Engine with AIR

3969869 3880828

390 Horsepower LS5 454 Engine

1971 Exhaust Manifold Casting Numbers

Left-Hand Right-Hand Application
3846559

3989036

270 Horsepower 350 Engine  

3872765

3932461

330 Horsepower LT1 350 Engine with AIR 

3880869* 3880828

365 Horsepower LS5 454 Engine

3880869* 3880828

425 Horsepower LS6 454 Engine  with AIR 

*3969869 also used.

 

1972 Exhaust Manifold Casting Numbers

Left-Hand Right-Hand Application
3932461

3989036

Early 200 Horsepower 350 Engine**  

3932461

3932461

Later 200 Horsepower 350 Engine**  

3932461*** 3932461***

255 Horsepower LT1 350 Engine with AIR

3969869 3880828

270 Horsepower LS5 454 Engine with AIR

**Manifolds not drilled and tapped for AIR (Air Injection Reactor) System except with NB2 (California) Emission System.

***386711 also used.

1973 Exhaust Manifold Casting Numbers

Left-Hand Right-Hand Application
3932461 3932461 All 1973-79 350 Engines
3969869 3880828 All 1973-74 454 Engines

1980-82 Exhaust Manifold Casting Numbers

Left-Hand Right-Hand Application
3932461 3932461 1980 190 & 230 Horsepower Cast Iron
14037671-W 14037672-W

Tabular Stainless Steel

1980 LG4 (305) & All 1981-82

 

Exhaust Manifold Notes

 

Cast-iron exhaust manifold casting dates may not be visible when manifold is installed due to date location. Some casting numbers may not be visible when installed due to equipment blocking view.  Casting date codes are generally the same as described for engine blocks, except some may not normally carry a calendar-year reference.  Those manifolds used with AIR (Air Injection Reactor) emissions equipment are drilled and tapped for AIR tubing.  Manifolds generally contain a cast-in "LH" (left-hand) or "RH" (right-hand) designating specific installation location.

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