Here is a list I put together awhile back. Any of the below
combinations will give you true duals without using a block off plate, and have
Olds manifolds.
WANT TO PUT DUALS ON AN OLDS SMALL BLOCK?
What I am listing are the combinations that can be used on a small block
for true duals.
Meaning, not having to use a block off plate. These
manifolds do not have the dividers like the more desirable W/Z's, but neither do
the crossover X-mans. Besides, you can't use a Z
manifold on a small
block.
LISTINGS READ AS FOLLOWS:
Year Used - ID/Code - Casting Number -
Application
--------------------------------------------
64-70 - 1 -
380001 - LH; X-over. 330 & 350
65-67 - W - 389268 - RH; Cutlass,
442.
--------------------------------------------
65-68 - X - 389269 -
LH; Cutlass, 442.
65-67 - W - 389268 - RH; Cutlass,
442.
--------------------------------------------
Year? - 1 - 411961 -
LH; No X-over. Straight
down. 307, 350 gas, 350 diesel.
65-67 - W - 389268
- RH; Cutlass, 442.
--------------------------------------------
Year?
- 1 - 411961 - LH; No X-over. Straight
down. 307, 350 gas, 350 diesel.
68
- Y - 398706 - RH; Cutlass, 442, some
VC and SX. Ribbed for heat
shield.
--------------------------------------------
64-70 - 1 -
380001 - LH; X-over. 330 & 350
68 - Y - 398706 - RH; Cutlass, 442, some
VC and SX. Ribbed for heat shield.
