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12520270 -5.7L 350CID (LO5-K) 1987-1995 Chevy & GMC Full Size Trucks & "G" Van & 1996-2002 "P" Van - Over 8,600 GVW

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

12520270
Availability: Ships today or next business day
Pricing: $2,029.88

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Description

For 1987-1995 Chevy/GMC trucks with 350 vin code "K" engine up to 7200 GVRW

Specs on this engine are as follows:

  • 1986 and up 4 bolt main 1 piece crankshaft seal block(no mechanical fuel pump provision)
  • Nodular iron crankshaft
  • Powdered metal connection rods
  • Dished hypereutectic pistons
  • 8.75:1 Compression ratio
  • High volume oil pump
  • Morse link type timing chain

Camshaft specs as follows:

  • Flat tappet hydraulic camshaft
    • Intake lift .382"
    • Exhaust lift .402"
    • Intake duration @.050-165.9
    • Exhaust duration @.050-174.8
    • Lobe center separation - 111.9
  • Camshaft mechanical specs
    • Intake valve opens @ -30.2 BTDC * Intake valve closes @ 16.1ATDC * Intake lobe centerline - 111.8
    • Exhaust valve opens @ 18.1BBDC * Exhaust valve closes @ -23.3 ATDC * Exhaust lobe centerline - 111.8

Cylinder Head Specs:

  • Casting number 14102191
  • Swirl port intake port design
  • 76cc Combustion chamber
  • 1.94" Intake valve 1.50" Exhaust valve
  • Valve spring part number is 3911068 (same spring used with the old 300hp 350 crate engine)
  • Installed height 1.70" Pressure @ Installed height is 80 LBS * Pressure with valve open is 267 lbs.
  • These springs are good for .550" lift but clearance between guide and retainer must be double checked before attempting.
  • 7 Bolt exhaust flange
  • Center bolt valve cover flange
  • 1987-1995 Intake manifold bolt pattern with center intake bolts canted @ 72 angle

This cylinder head is not a performance oriented cylinder head. It is classified as a high swirl head that was intended for good bottom end torque and fuel economy. The intake runner is restrictive because it has a ramp cast into the bottom of the bowl to promote high swirl.

Engine also includes:

  • 4 Quart oil pan (5w/ Filter)
  • Timing cover
  • 8" Balancer
  • Valve covers

We do not recommend attempting to run this engine in a carbureted application because of the lack of a fuel pump provision. Special intake manifold is required

Applications:
RPO - L05
Fits:
1987 - 1990 Chevrolet Chassis (P2,3)
1987 - 1990 GMC Chassis (P2,3)
1991 - 1996 Chevrolet Chassis (P3)
1991 - 1996 GMC Chassis (P3)
1987 - 1991 Chevrolet Pickup (RV2,3)
1987 - 1991 GMC Pickup (RV2,3)
1987 - 1991 GMC Suburban (RV2,3)
1988 - 1995 GMC Pickup (CK2,3)
1988 - 1995 Chevrolet Pickup (CK2,3)
1987 - 1999 Chevrolet Van (G3)
1987 - 1996 GMC Van (G3)

General Motors limited 3 year / 100,000 parts & labor warranty. Click on Document tab above for full details.

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Application List

Universal

Details

  • 12520270
  • 12520270
  • GM (General Motors)
  • Ships today or next business day
  • New

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