General Specifications for the 198 and 225 Cubic Inch V-6. The following information has been directly complied from original Buick service manuals.
Area | Lb. Ft. |
Crankshaft Bearing Caps to Cylinder Block | 95-120 |
Connecting Rods | 30-40 |
Cylinder Head to Cylinder Block | 65-80 |
Fan Driving Pulley to Harmonic Balancer | 18-25 |
Flywheel to Crankshaft (Auto. & Manual) | 50-65 |
Oil Pan to Cylinder Block | 9-13 |
Oil Pan Drain Plug | 25-35 |
Oil Pump Cover to Timing Chain Cover | 8-12 |
Oil Pump Pressure Regulator Retainer | 25-30 |
Oil Screen Housing to Cylinder Block | 6-9 |
Oil Pan Baffle to Cylinder Block | 9-13 |
Oil Gallery Plugs | 20-30 |
Filter Assembly to Pump Cover | 10-15 |
Timing Chain Cover to Block | 17-23 |
Water Pump Cover to Timing Chain Cover | 6-8 |
Fan Driven Pulley | 17-23 |
Thermostat Housing to Intake Manifold | 17-23 |
Intake Manifold to Cylinder Head | 45-55 |
Exhaust Manifold to Cylinder Head | 10-15 |
Carburetor to Intake Manifold | 10-15 |
Air Cleaner Stud | 17-23 Lb. In. |
Air Cleaner Wing Nut | 17-23 Lb. In. |
Fuel Pump to Cylinder Block | 17-23 |
Motor Mount to Cylinder Block | 50-75 |
Fuel Pump Eccentric and Timing Chain Sprocket to Camshaft | 40-55 |
Rocker Arm Cover to Cylinder Head | 3 to 5 |
Rocker Arm Shaft Bracket to Cylinder Head | 25-35 |
Delcotron Bracket to Cylinder Head | 30 to 40 |
Delcotron Bracket to Water Pump Timing Chain Cover | 18-25 |
Delcotron Mounting Bracket thru Delcotron to Cylinder Head at Pivot Location | 30-40 |
Starting Motor to Block | 30-40 |
Starting Motor Brace to Block | 9-13 |
Starting Motor Brace to Starting Motor | 9-13 |
Distributor Hold down Clamp | 10-15 |
Spark Plugs | 25-35 |
Manual Lower Flywheel Housing | 9-13 |
Flywheel Housing to Cylinder Block | 30-40 |
Timing Chain Damper to Cylinder Block Bolt | 6-9 |
Bolt - Special Moveable Timing Chain Damper | 10-15 |
GENERAL SPECIFICATIONS | |
Engine Type | 90° V-6 |
Valve Arrangement | In Head |
Bore and Stroke | 3.750 x 3.400 |
Piston Displacement | 225 Cu. In. |
Compression Ratio | 9.0 to 1 |
Brake Horsepower @ RPM | 160 BHP @ 4400 |
Torque § RPM | 225 Lb. Ft. @ 2400 |
Octane Requirement | 85 Motor Method |
Octane Requirement | 93 Research Method |
Taxable Horsepower | 33.748 |
Cylinder Numbers Front to Rear Right Bank | 2-4-6 |
Left Bank | 1-3-5 |
Firing Order | 1-6-5-4-3-2 |
Cylinder Block Material | Cast Iron |
Cylinder Head Material | Cast Iron |
Engine Idle Speed | |
.....Manual | 550 |
.....Automatic | 550 Drive |
.....AC Auto | 600 Drive |
Piston and Piston Pin Specifications | |
Piston Material | Cast Aluminum Alloy |
Piston Treatment | Tin Plated |
Piston Pin Material | SAE 1018 |
Piston Pin Type | Pressed In Rod |
Connecting Rod Specifications | |
Material | Pearlitic Malleable Iron |
Bearing Type | Removable Steel Backed |
Bearing Material | M100 Durex |
Rod Length | 5.960 |
Rod Width | .835 |
Ring Specifications, Compression Ring Material & Surface Treatment | #1 | Iron - Chrome Plated |
#2 | Iron - Lubricated |
Oil Ring Type | Dual Steel Rail with Spacer |
Oil Ring Expander | Steel Humped Ring |
Location of Rings | Above Piston Pin |
Crankshaft Specifications | |
Material | Pearlitic Malleable Iron |
Bearings | 4 Replaceable Liner |
Bearing Material | M100 Durex |
Bearing Taking End Thrust | #2 |
Camshaft Specifications | |
Material | Cast Alloy Iron |
Bearings | Steel Backed Babbitt |
Number of Bearings | 4 |
Camshaft Location | Above Crankshaft at Center of "V" |
Type of Drive | Chain |
No. of Links | 54 |
Crankshaft Sprocket | Sintered Iron |
Camshaft Sprocket | Nylon Coated Aluminum |
Valve Specifications | |
Intake Valve Material | SAE 1041 Steel |
Exhaust Valve Material | GM-N82152(21-4N) |
Valve Lifter Type | Hydraulic |
Valve Spring | Single Helical |
Lubrication System Specifications | |
Type of Lubrication Main Bearings | Pressure |
Connecting Rods | Pressure |
Piston Pins | Splash |
Camshaft Bearings | Pressure |
Timing Chain | Splash & Nozzle |
Cylinder Walls | Splash & Nozzle |
Oil Pump Type | Gear Driven |
Normal Oil Pressure | 33 Ibs. @ 2400 RPM |
Oil Pressure Sending Unit | Electrical |
Oil Intake | Screened Tube |
Oil Filter System | Full Flow |
Filter Type | Throw-Away Element & Can |
Crankcase Capacity Less Filter | 4 qts. |
With Filter | 5 qts. |
Cooling System Specifications | |
System Type | Pressurized Utilizing Cross-Flow Radiator |
Radiator Cap Relief Pressure | 15 psi |
Thermostat | Choke Type Opening at 180° |
Water Pump Type | Centrifugal |
GPM @ RPM | 14@1000 |
Drive | V-Belt |
Bearings | Double Row |
By-Pass Recirculation Type | External |
Cooling System Capacity With Heater | 11.2 qts. |
W/O Heater | 10.5 qts. |
With AC | 11.2 qts. |
Fan Diameter and Number of Blades | |
Less AC | 17" - 4 |
With AC | 18" - 7 |
Fan Drive Less AC | Water Pump Shaft |
With AC | Torque and Temperature Sensitive Clutch |
ENGINE DIMENSIONS AND FITS | |
Deck Height | 10.187 |
Rings, Piston, and Piston Pin Specifications | |
Piston Clearance Limits | |
....Top Land | .0265" - .0345" |
....Skirt - Top | .0005" - .0011" |
....Skirt - Bottom | .0005" - .0021" |
Ring Groove Depth | |
....#1 - Compression Ring | .1855" - .1930" |
....#2 - Compression Ring | .1880" - .1955" |
....#3 - Oil Ring | .1880" - .1955" |
Ring Width | |
....#1 - Compression Ring | .0785" - .0790" |
....#2 - Compression Ring | .0770" - .0780" |
....#3 - Oil Ring | .1810" - .187" |
Ring Gap | |
....#1 - Compression Ring | .010" - .020" |
....#2 - Compression Ring | .010" - .020" |
....#3 - Oil Ring | .015" - .035" |
Piston Pin Length | 3.060" |
Diameter of Pin | .9394" - .9397" |
Clearance | |
....In Piston | .0001" - .0004" |
....In Rod | .0007" - .0015" |
Press Direction & Amount Offset in Piston .040" Toward High Thrust Side | |
*A11 Measurements in Inches Unless Otherwise Specified. |
Connecting Rod Specifications | |
Bearing Length | .737" |
Bearing Clearance (Limits) | .0020" - .0023" |
End Play - Total for both Rods | .006" - .014" |
Crankshaft Specifications | |
End Play at Thrust Bearing | .004" - .008" |
Main Bearing Journal Diameter | 2.4995" |
Crank pin Journal Diameter | 2.0000" |
Main Bearing Overall Length | |
....#1 | .864" |
....#2 | .1057" |
....#3 | .864" |
....#4 | .864" |
Main Bearing to Journal Clearance | .0005" - .0021" |
Camshaft Specifications | |
Bearing Journal Diameter | |
....#1 | 1.755" - 1.756" |
....#2 | 1.725" - 1.726" |
....#3 | 1.695" - 1.696" |
....#4 | 1.665" - 1.666" |
Journal Clearance in Bearings |
Valve System Specifications | |
Rocker Arm Ratio | 1.6 to 1 |
Rocker Arm Clearance On Shaft | .0017" - .0032" |
Valve Lifter Diameter | .8422" - .8427" |
Valve Lifter Clearance in Crankcase | .0015" - .003" |
Valve Lifter Leak down Rate | 12 to 60 Sec. in Test Fixture |
Intake Valve | |
Head Diameter | 1.625" |
Seat Angle | 45° |
Stem Diameter | .3412" Top - .3407" Bottom |
Clearance in Guide | Top .001"-.003" - Bottom .0015"-.0035" |
Stem Height | 1.8450-1.8750" |
Exhaust Valve | |
Head Diameter | 1.3750" |
Seat Angle | 45° |
Stem Diameter | 3407" Top - .3402" Bottom |
Clearance in Guide | Top .0015"-.0035" - Bottom .002"-.004" |
Installed Stem Height | 1.8450-1.8750" |
Valve Spring | |
Valve Closed - Pounds @ Length | 64 ± 5 @ 1.727" |
Valve Open - Pounds @ Length | 164 ± 6 @ 1.340" |
Cubic Inches | V-225 | V-198 | V-231 |
Bore | 3.750 | 3.625 | 3.800 |
Stroke | 3.400 | 3.200 | 3.400 |
Rod Length | 5.960 | - | 5.960 |
Rod / Stroke Ratio | 1.7529 | - | - |
Bore / Stroke Ratio | 1.1029 | - | - |
Bore Spacing | 4.240 | - | - |
Deck Height | 10.187 | 10.187 | 9.535 |
Comp. Distance | 1.870 | 1.844-1.860 | - |