|
|
Exhaust Manifolds 1964 - 1990
Exhaust Manifolds 1964 - 1990
The 1969-72 exhaust manifolds feature a divider between the
center exhaust ports. The 1967 and earlier models do not have this feature.
Also, all manifolds except 1970 to 1972 will have a heat riser (shutoff) on the
left-side exhaust manifold.
All Olds small-blocks with dual exhausts used the
single-exhaust right-hand manifold, with one opening capped off. There are
no true dual exhaust small block manifolds.
[ Thanks to Kevin Hoopingarner, Bob Barry for this information ]
Identification
The cast-in ID consists of a large [1"] letter or number, usually found at
the front, over the front exhaust port. On earlier units, it can be found
over the REAR exhaust port. There is also a 6-digit casting ID, usually
somewhere near the center.
As per convention, if the big single-character
ID is a number rather than a letter, that denotes a small block part. It
was not uncommon, especially after 1970, for small block exhaust manifolds,
such as 1 and 4 or 5, to be used on big block cars. Sometimes you can
find dual exhaust manifolds on big cars, too.
Exhaust manifolds come in many styles, we'll cover the most popular.
The main difference for the performance enthusiast is whether the center
ports are divided in the manifold, as in the late W and Z units. LH= for
left hand side, RH= for right hand side of engine.
D, E, G, H, J, K?- Toronado exhaust manifolds. Duals. They typically
turn up and out at the outlet, far more so than those for any other car.
Since that would run the exhaust into the frame or body of most cars, these
are useful mainly for identifying a Toronado engine.
A number of sources have pointed out that there is no difference between
W-30 and 442 exhaust manifolds. An article in JWO explained confirmed this.
NOTE: The W 389268 was not used on the 68 442 as stated in the Supercars
book and other places. The 68 uses a unique manifold (Y-398706) with heat
shield.
[ Thanks to Chris Witt, Ed Ekstrom, Dan Williams for this information ]
Year ID/ Casting
Used Code Number Application
'65 - '67 X 389269 LH; Cutlass, 442.
W 389268 RH; Cutlass, 442.
'67 - '69 A 384785 LH; full size. 425.
T 39870934 RH; full size. 425.
'68 Cutlass: early 1968 models use same as 1967.
Cutlass: late 1968 models use same as 1969.
'68 T 398708 RH; big block
X 389269 LH; Cutlass, 442, some VC and SX.
Y 398706 RH; Cutlass, 442, some VC and SX.
R LH; full size.
'68 - '70 S 384895 RH; full size. With heat shield to protect
steering box.
'69 - '74 W 402295 LH; Cutlass, 442, W-30, H/O.
'69 - '72 Z 402294 RH; Cutlass, 442, W-30, H/O.
'70 - '?? X 412287 LH: full size, Cutlass.
'73 - '74 X 412287 LH: 442, W-30.
H 411970 RH; Toro.
J 407103 LH; Toro.
1 380001 LH; X-over.
1 411961 LH; No X-over. Straight down. 350 diesel. Gas also.
1 411981 LH; 350 gas.
'65 2 380145 LH; 330.
3 381921 RH; X-over.
4
'68 - '73 5 398704 RH; X-over. 350. Delta 88.
8 558319 With "Z-Y" underneath the "8".
8 558480 With "H-Y" underneath the "8".
'81 14 22503678 LH; 260.
'81 17 2506300 RH; 260.
3 563619 RH; 350 diesel. Gas also?
[ Thanks to Chris Witt, Kevin Hoopingarner, Mark Prince, Kevin O'Brien,
Matt Cremean
for this information ]
Detailed Listing
| ID | Casting # | Side
| |
| A | 384785 | LH | |
|
Used on big cars about 1967 to 1969. Single outlet
is straight down in the center, not good for an A-body car. Companion
to T, typically. |
| H | 411970 | RH | |
|
Toronado. |
| J | 407103 | LH | |
|
Toronado. |
| R | | LH | |
|
Used on big cars. ## holes?, exit angle?
Might fit in A-bodied cars, with effort. Companion to T, typically. |
| T | 3987094 | RH | |
|
Used on big cars about '67-'69. Two holes;
one for crossover pipe from the LH side. Main outlet has 2-bolt
flange angled about 45 degrees down and back. Might fit in A-bodied
cars, with effort. Companion to A, typically. |
| W | 389268 | RH | |
|
1965-67, A-body with big block and dual
exhaust. This one has the W over the rear runner. Does NOT have
a divider between center ports. One 2.5" outlet, 2-bolt flange,
points about straight down. Companion to X-389269-LH. See also
Y-389268-RH [?] |
| W | 402295 | LH | |
1969-72 442, W-30, H/O, A-body with big block and
dual exhaust. "W" is over the front runner. THE most
desirable set to have. Has divider between center ports. One 2.5"
outlet, 2-bolt flange, points about straight down. Companion to
Z-402294-RH.
|
| X | 389269 | LH | |
|
1965-68 442, A-body, some Vista Cruiser and SX's with big block and
dual exhaust. This one has the W over the *rear* runner. Does
NOT have a divider between center ports. One 2.5" outlet,
2-bolt flange, points about straight down. Companion to W-389268-RH. |
| X | 412287 | LH | |
|
1970-up? A-, B-, C-body with big block and
dual exhaust. Has the divider between center ports. One 2.5"
outlet, 2-bolt flange, points about straight down. Good substitute
for W-402295-LH. |
| X | 412287 | LH | |
|
1973-74 442, W-30 with big block and
dual exhaust. Has the divider between center ports. One 2.5"
outlet, 2-bolt flange, points about straight down. Good substitute
for W-402295-LH. |
| Y | 398706 | RH | |
|
1968 442's, A-body, some Vista Cruiser and SX's with big block and dual
exhaust. This one has the Y over the front runner. Does NOT have
a divider between center ports. One 2.5" outlet, 2-bolt flange,
points about straight down. The manifold has raised ridges in
it and a heat sheild that rests on them. Companion to X-389269-LH. |
| Z | 402294 | RH | |
|
1969-74 442, W-30, H/O, A-body with big block and
dual exhaust. THE most desirable set to have. Has divider between
center ports. One 2.5" outlet, 2-bolt flange, points about
straight down. Companion to LH unit W-402295 LH. |
| 1 | 411961 | | |
|
Small block. ?? about divider. ?? about outlet size, 2-bolt flange,
points about straight down. Companion to ?? unit 4-?????? unit. |
| 4 | | | |
|
Small block. ?? about divider. ?? about outlet size, 2-bolt flange,
points about straight down. Companion to ?? unit 1-411961. |
| 14 | 22503678 | LH | |
|
1981 260 small block with single exhaust. ?? about divider. ?? about outlet size,
3-bolt flange, points about straight down. Companion to RH
unit 17-2506300. |
| 17 | 2506300 | RH | |
|
1981 260 small block with single exhaust. ?? about divider. ?? about outlet
size, 3-bolt flange, points about straight down. Companion to LH unit
14-22503678. |
Typical exhaust manifold pairs, left/right, are:
X/W, X/Y, W/Z, A/T, R/T, R/S, D/E, G/H, J/K, 1/4, 1/5, 14/17
[ Thanks to Chris Witt, Ed Ekstrom, Dan Williams, Mark Prince for this information ]
|
|