19432778 5.7 350 Chevy V8 1987 - 1995 General Motors Engine replaces 12691671, 12703983, 12681430 and 12568758
4 Bolt Mains

Free Shipping to a business
with a forklift in the lower 48
Questions? Call 847-276-8110

What's New

• Cylinder head and block castings
• Forged-steel crankshaft
• All blocks are four-bolt main
• All blocks are roller camshaft-ready
• All blocks are mechanical fuel pump-capable (Gen1e has no camshaft eccentric)
• Machined using state-of-the-art CNC
• Machined and assembled in the USA

L05
1987 1994 CHEV/GMC VAN (G1,2,3)
1995 1995 CHEV/GMC VAN (G2,3)
1987 1987 CHEV/GMC PICKUP,SUBURBAN (RV1,2)
1988 1991 CHEV/GMC SUBURBAN (RV1)
1988 1995 CHEV/GMC PICKUP,SUBURBAN,TAHOE (CK1,2)

Early 90's design cylinder heads w/different center bolt drill angle.
Flat style lifters, but machined for roller lifters
Machined fuel pump hole but no lobe on the cam shaft.
Center bolt valve covers.

 

 

Information	Gen 1
	12691671
	General (Stock Configuration)
RPO	LO5
Liter Displacement	5.7
Cubic Inch Displacment	350
Bore (inches)	4.000
Stroke (inches)	3.480
Firing Order	1-8-4-3-6-5-7-2
Cylinder Head Material	Cast Iron
	Block
Main Bearing Cap Design	4 bolt cast iron
Block Part Number	12691718
Block Casting Number	10243880
Core Plug Material	Stainless Steel
Deck Height (Inches)	9.025
	Camshaft
Material	Cast Iron
Camshaft Type	Flat Tappet Lifter
Cam Bearings	New, OE /Spec
Number of Bearings	5
Type of Drive	Silent Link Chain
	Crankshaft
Material	Forged 1053 Steel
Crank Journal Diameter (inches)	2.750
Number of Bearings	5
Rear Main Seal	1 pc.
Harmonic Ballancer	12551538
	Connecting Rods
Material	Powdered Metal Steel
Connecting Rod Ratio	1.58:1
Rod Bearings	OE
	Pistons
Material	Graphite Coated Hypereutectic
	Valve System
Type of Drive	OHV
Lifters	Hydraulic Flat Tappet
Valve Rotators	Yes
Pushrods	Tubular Steel
RockArm Ratio	1.5:1
	Cylinder Head
Exhaust Seats	Induction Hardened
	Valves
Intake Valve Material	Steel
Intake Face Angle (degrees)	45
Intake Guides	Integral
Intake Head Diameter (inches)	1.94
Intake Lift (inches)	0.3850
Intake Duration (degrees)	194 @ 0.050
Exhaust Valve Material	Steel
Exhaust Face	Hardened
Exhaust Face Angle (degrees)	45
Exhaust Guides	Integral
Exhaust Head Diameter (inches)	1.5
Exhaust Lift (inches)	0.4040
Exhaust Duration (degrees)	202 @ 0.050
	Oil Pump
Type	Melling w/screen
Oil Pressure	Stock
Volume	Stock

Terms and Conditions
Warranty Information
GM Goodwrench Crate Engine Start-up Instructions

Link to specs