The Engine Page

 

 
General Description

The line of six cylinder engines used in Chevrolet light and medium duty trucks are very tough and durable. The cylinders are numbered from the front of the engine to the rear; the forward cylinder always being the #1 cylinder. The firing order for a 4-cylinder L4 engine is 1-3-4-2 and the firing order for a 6-cylinder L6 engine is 1-5-3-6-2-4. The 4-cylinder engine has five main bearing and the 6-cylinder engine has seven main bearings. Both engine configurations use hydraulic valve lifters and hollow push rods to operate the individually mounted rocker arms which pivot on ball seats. A gear-type oil pump driven by the distributor shaft provides full pressure lubrication for each of these engines. The main oil gallery along the hydraulic lifter area passes oil through drilled passages to each cam and main bearing, through the hydraulic lifters and hollow push rods to the rocker arms.

Click on the following thumbnails to see an example of some engines, a cross sectional view showing the flow of oil through an engine and exploded view illustrations of a typical 6-cylinder engine.

             

        

Engine Specifications

 

Engine

Displacement

Compression Gross HP Net HP Gross Torque Net Torque Spark Plug
153 L-4 153 8.5:1 90 @ 4000 75 @ 4000 152 @ 2400 144 @ 2600 AC46-N
230 L-6 230 8.5:1 140 @ 4400 120 @ 3600 220 @ 1600 200 @ 1600 AC44
  230 L-6 * 230 8.5:1 125 @ 3400 100 @ 3200 210 @ 1600 200 @ 1200 AC44
292 L-6 292 8.0:1 165 @ 3800 147 @ 3600 280 @ 1600 262 @ 2000 AC42-5
283 V-8 283 8.5:1 175 @ 4400 145 @ 4200 275 @ 2400 245 @ 2000 AC44
327 V-8 327 8.0:1 185 @ 4400 158 @ 4400 305 @ 2000 280 @ 2000 AC42-1
348 V-8 348 7.75:1 220 @ 4400 180 @ 4000 325 @ 2600 300 @ 2400 AC42-N
409 V-8 409 7.75:1 252 @ 4000 215 @ 4000 390 @ 2400 352 @ 2400 AC42-N
4-53 Diesel 212 17.0:1 130 @ 2800 118 @ 2800 271 @ 1500 263 @ 1500 N/A
6V-53 Diesel 318 17.0:1 195 @ 2800 183 @ 2800 423 @ 1500 415 @ 1500 N/A
 

 

1964 Truck Engine Tune-Up Specifications

 

Specifications

Engines

153 CID 230 CID 292 CID 283 CID 327 CID 348 CID 348 CID 409 CID
Carburetors Carter YF Rochester B Rochester 2G Rochester 4G
Compression (Note 1) 130 PSI 140 PSI
Spark Plugs Make & Number AC 46N AC C42N AC 44 AC 42-1 Com AC C42N
Gap & Torque 0.035" @ 20 - 25 Ft. Lbs.
Ignition
Distributor
Dwell Angle 31 - 34 28 - 32
Point Gap 0.019" (New) - 0.016 (Used)
Spring Tension 12 - 23 in. Oz.
Condenser 0.18 - 0.25Mfd.
Fan Belt 75 5 Lbs. using Strand Tension Gauge
Air Cleaner (Note 2)  
Valve Lash Intake Hydraulic - 1 Turn Down from "No Lash" Point
Exhaust Hydraulic - 1 Turn Down from "No Lash" Point
Ignition Timing (Note 3) 4 BTDC 8 BTDC 4 BTDC
Engine RPM Synchromesh 450 - 500 RPM
Powerglide (Note 4) 450 - 500 RPM
Fuel Pump Pressure 3 - 4 PSI 5 - 6 PSI
Volume One Pint in 30 - 45 Seconds
Cooling System Radiator Pressure 7 PSI & 13 PSI 9 PSI
 

Notes:

 

1 At cranking speed w/ wide open throttle - maximum variation between cylinders is 20 PSI.

2  Paper Element - Service at 12,000 miles initially and then every 6000 miles thereafter.

   Oil Wetted Polyurethane - Service every 12,000 miles

   Oil Bath - Change oil at regular engine oil change intervals

3 At idle speed w/ vacuum advance line disconnected and plugged.

4 In "Drive" position.

 

 

L6 Truck Engine Illustrations

 

 

   

   
   

230 CID L6 Engine

   

     

250 CID L6 Engine

     

292 CID L6 Engine

 

 

Many thanks to Michael "Jolly" Goodfellow for allowing me to use these engine graphics for my web site. Jolly has an outstanding site packed with hard to find information about '60 - '66 GMC trucks. Check out Jolly's site at http://6066gmcclub.com/gmcguy/

 

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