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 |
