Intake Manifold Installation

Install end seals on block. Install side gaskets on cylinder heads using sealing compound around water passages. Install manifold being careful not to displace gaskets and seals. Tighten manifold bolts evenly in sequence shown in diagram to correct torque as listed.

NOTE: If crankshaft has been rotated while distributor was removed, time distributor again to number 1 cylinder.

Fig 1: Intake Manifold Tightening Sequence

Courtesy of GENERAL MOTORS COMPANY

PISTONS, PINS, RINGS

PISTONS

PINS

RINGS

Engine

⁽¹⁾Clearance

Piston Fit

Rod Fit

Rings

End Gap

Side Clearance

1968

396"

(325, 350 HP)

.0007-.0013"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.010-.030"

.0005-.0065"

(375 HP)

.0036-.0042"

.0003.0004"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.010-.030"

.0005-.0065"

427"

(385, 390, 400 HP)

.0009-.0015"

.00025-.0035"

.0008-.0016"

1 & 2

.010-.020"

.0017-.0032"

.010-.030"

.0005.0065"

(425, 435 HP)

.0037.0043"

.00030-.00040"

.0008.0016"

.010-.020"

.0017-.0032"

.010-.020"

⁽¹⁾

.010.030"

.0005.0065"

(435 HP, 4-Bbl.)

.0054.0063"

.0045.00055"

.0008.0016"

1 & 2

.010-.020"

.0017.0032"

.010.030"

.0005.0065"

1969

396"

(265, 325, 350, 375 HP)

.0010-.0018"

.00025.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

⁽⁴⁾

⁽³⁾

.010-.030"

.0005.0065"

427"

(335, 390, 400 HP)

.0012.0020"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.010-.030"

.0005.0065"

(425 HP)

.0037-.0043"

.00030.00040"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.010.030"

.0005.0065"

(430 HP)

.0054.0063"

.00045-.00055"

.0001-.0008"

1 & 2

.010-.020"

.0017-.0032"

.010.030"

.0005.0065"

(435 HP)

.004.0048"

.00030.00040"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.010.030"

.0005.0065"

1970

396" (402")

(350 HP)

.0018-.0026"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.010-.030"

.0005-.0065"

(375 HP)

.0036-.0042"

.0003-.0004"

.0008.0016"

1 & 2

.010-.020"

.0017.0032"

.010-.030"

.0005-.0065"

400" (402")

(330 HP)

.0018-.0026"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.015-.0055"

.0005-.0065"

454"

(345, 360, 390 HP)

.0024-.0034"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.015-.055"

.0005.0065"

(450, 460 HP)

.004.005"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0005-.0065"

.015-.055"

.0005-.0065"

1971

402"

(300 HP)

.0018.0026"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.015-.055"

.0005-.0065"

454"

(365 HP)

.0024-.0034"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.015-.055"

.0005.0065"

(425 HP)

.004.005"

.00025-.00035"

.0008-.0016"

1 & 3

.010-.020"

.0017.0032"

.015-.055"

.0005.0065"

1972

402"

(300 HP)

.0018-.0028"

.00025-.00035"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.015-.055"

.0005-.0065"

454"

(365 HP)

.0024.0034"

.0003-.0004"

.0008-.0016"

1 & 2

.010-.020"

.0017.0032"

.015.055"

.0005.0065"

1973

454"

.0018-.0028"

.00025.00035"

.0008.0016"

1 & 2

.010-.020"

.0017.0032"

.015-.055"

.0005.0065"

⁽¹⁾	Measured approx. 2 1/2" from top of piston.

⁽²⁾	Except 375 HP =.0036-.0042"

⁽³⁾	Except 375 HP =.0003-.0004"

⁽⁴⁾	425 HP engine is.0012-.0032" 435 HP engine is.0017-.0032"

⁽⁵⁾	Interference fit.