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Buick Staging Chart

  1. 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
  2. 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
  3. 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 heatig small end of rods to approximately 450 degrees.
  4. Intake manifold gasket, Group 3.270, Part No. 1383831 (blocked heat riser)
  5. Connecting Rod Bearings (.001-inch oversize to increase clearance without regrinding 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
  6. 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
  7. Metering Rods, (6% richer)
    Part Group Part No.
    rod, metering 3.802 7034822
  8. 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
  9. Spark Plugs - AC 40TS or 42TS
  10. Exhaust headers: Recommended 2 1/4 inch diameter, individual pipes, 36 - 40 inches in length.
  11. 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 convensional industry standards

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