Manifold Identification Codes

INTAKE MANIFOLDS
RPO
ENGINE
HP
CASTING #
MATERIAL
Base
327
300
3872783
Cast Iron
L79
327
350
3890490
Aluminum
L36
427
390
3866948
Cast Iron
L72
427
425
3885069
Aluminum

EXHAUST MANIFOLDS
ENGINE
 HP
LEFT SIDE
RIGHT SIDE
OPTIONS
327
300
3846559
3747042
---
350
---
327
300
3872765
3872778
A.I.R.
350
A.I.R.
427
390
3880827
3880828
---
425
---