Buick Stage I Chart
- Stage I, Valve Train Package
Part |
Group |
Part No. |
Camshaft - Stage I |
0.519 |
1383853 |
Pushrod, tubular |
0.426 |
1383852 |
Valve spring and damper assembly (272 lbs.) |
0.303 |
1383851 |
Spring, oil pump (60 lbs.) |
1.609 |
1383854 |
- Stage II,
Part |
Group |
Part No. |
Camshaft - Stage II (not recommended for the street) |
0.519 |
1385557 |
Valve train and damper assembly |
0.303 |
1383851 |
Pushrod, tubular |
0.426 |
1383852 |
Spring, oil pump (60 lbs.) |
1.609 |
1383854 |
- Piston and Pin Assemblies (forged aluminum, 11.0:1 comp.)
Part |
Group |
Part No. |
Piston and Pin, (400 cid) |
0.629 |
1394179 |
Piston and Pin, (430 cid) |
0.629 |
1394179 |
Note: Recommended running clearance of these pistons is .006-.0010-inch. (.008-.012 wide open throttle applications.) Chrome piston pins are to be installed in pistons by heating small end of rods to approximately 450 degrees. |
- Intake manifold gasket, Group 3.270, Part No. 1383831 (blocked heat riser)
- Connecting Rod Bearings (.001-inch oversize to increase clearance without re grinding crank. Running clearance should be .002-.0025.)
Part |
Group |
Part No. |
Connecting rod bearings (std.) |
0.616 |
5468714 |
Connecting rod bearings (+.001) |
0.616 |
5468713 |
- Main Bearings (Fully grooved for increased lubrication. Use in No. 2, 3 thrust and 4 locations only. Running clearance is .0011-.0015 maximum.
Part |
Group |
Part No. |
No. 2, 4 Main Std. |
0.096 |
5469067 |
No. 2, 4 Main +.001 |
0.096 |
5469066 |
No. 2, 4 Main +.002 |
0.096 |
5469065 |
No. 3, Thrust Std. |
0.101 |
5469064 |
No. 3, Thrust +.001 |
0.101 |
5469063 |
No. 3, Thrust +.002 |
0.101 |
5469062 |
- Metering Rods, (6% richer)
Part |
Group |
Part No. |
rod, metering |
3.802 |
7034822 |
- Low-tension piston rings (Use with either std. or optional forged pistons.)
Part |
Group |
Part No. |
Piston rings 400 cid |
0.643 |
1394202 |
Piston rings 430 cid |
0.643 |
1394203 |
- Spark Plugs - AC 40TS or 42TS
- Exhaust headers: Recommended 2 1/4 inch diameter, individual pipes, 36 - 40 inches in length.
- General: Maintain minimum of 4 1/2 psi fuel pressure at carburetor. Maintain oil level 1 quart low to prevent foaming.
|
We had to add this GREAT bit of info. These are the specs for a Stage I cam measured in the conventional format! |
Intake
Lift
|
Exhaust
Lift
|
Intake
Duration
|
Exhaust
Duration
|
Centerline
|
.415"
|
.445"
|
210°
|
222°
|
110°
|
These measurements are not G.M.! They are the original cam measure to conventional industry standards |
This is all we have for Stage II cam specs. |
Intake
Lift
|
Exhaust
Lift
|
Advertised
Intake
Duration
|
Advertised
Exhaust
Duration
|
Intake
open/close
|
Exhaust
open/close
|
.455"
|
.480"
|
340°
|
360°
|
52°/108°
|
112°/68°
|
These measurements are G.M.!
They are from GS-X-Tra, (Sept./Oct. '82) |
Stage I Head Casting Numbers |
Head Cast # |
Year |
Displacement |
1240150 |
1970 |
455 |
1240146 |
1971 |
455 |
1238530 |
1972 |
455 |
1242002 |
1973-74 |
455 |
Stage I heads are the same as regular production heads with the addition of larger valves and firmer springs. The OE part numbers are: intake - 234604, exhaust - 234605, springs - 1383851
STAGE I |
PART NUMBER |
DESCRIPTION |
1231109 |
cylinder heads |
1383853 |
camshaft
Intake
Lift
|
Exhaust
Lift
|
Intake
Duration
|
Exhaust
Duration
|
Centerline
|
0.406"
|
0.441"
|
316°
|
340°
|
115° (some with 113° of overlap exist)
|
|
1383851 |
272-pound valve spring and damper assembly |
1383852 |
tubular pushrods |
1383854 |
60-pound oil pump regulator spring |
7029246 |
Rochester Quadrajet |
6470098 |
heavy-duty fuel pump with 6 to 8 p.s.i. |
1112016 |
distributor |
1394440
1394348 |
Wildcat mufflers 2-1/4-inch dual exhaust |
3017258 |
heavy-duty radiator |
1245632 |
special water pump fan clutch |
1239013 |
seven-blade fan |
|
Higher stall speed and modified governor in automatic transmissions |
|
Positive traction rear axle |
|
3.64:1 rear axle ratio (on cars without air conditioning; 3.42 on cars with) |
|
Dress-up kit, including monograms, valve covers and air cleaner lid |
STAGE II |
PART NUMBER |
DESCRIPTION |
1385557 |
Cam Shaft
Intake
Lift
|
Exhaust
Lift
|
Intake
Duration
|
Exhaust
Duration
|
Centerline
|
0.455"
|
0.480"
|
340°
|
360°
|
120°
|
|
1394179 |
11:1 compression ratio flattop pistons |
1394202 |
low-tension piston rings |
1383831 |
intake manifold gaskets |
7034822 |
secondary metering rods |
|
Edelbrock B4B aluminum intake manifold |
|
Holley 850 carburetor |
|
Mickey Thompson Super Scavenger tubular headers |
|
4.78:1 rear axle ratio |