What Size Crank Bolt On A Buick Nailhead

Buick Nailhead, Engine Specifications and Blueprinting

Buick Nailhead, 425

General Specifications for the 1966 Buick 401 and 425 Cubic Inch Engines The following information has been directly complied from original Buick service manuals for the corresponding year of vehicle industry. These specifications should too exist correct for the 1966 model year.

BOLT TORQUE SPECIFICATIONS

Use a reliable torque wrench to obtain the figures listed below. This volition forestall straining or distorting the parts besides as preventing thread impairment. These specifications are for clean and lightly lubricated threads only. Dry or dingy threads produce friction which prevents accurate measurement of the actual torque. It is of import that these specifications be strictly observed. Over tightening can damage threads. This volition forbid attainment 'of the proper torque and will require replacement of the damaged part.

Area	Lb. Ft.
Spark Plugs	25-35
Crankshaft Bearing Caps to Cylinder Block	80-110
Connecting Rods	xl-50
Cylinder Head to Cylinder Cake	65-lxxx
Harmonic Balancer to Crankshaft	200 Minimum
Fan Driving Caster to Harmonic Balancer	18-25
Flywheel .to Crankshaft (Automobile. & Manual)	50-65
Oil Pan to Cylinder Block	9-13
Oil Pan Drain Plug	25-35
Oil Pump Cover to Oil Pump	eight-12
Oil Pick-Up Tube & Screen Housing Assembly to Oil Pump	6-9
Oil Pump to Cylinder Block	thirty-40
Oil Gallery Plugs	25-35
Oil Filter to Cylinder Block	10-fifteen
Timing Chain Cover to Block	17-23
Water Pump Cover to Timing Chain Cover	6-viii
Fan Driven Caster	17-23
Thermostat Housing to Intake Manifold	17-23
Intake Manifold to Cylinder Head	25-35
Frazzle Manifold to Cylinder Head	10-xv
Carburetor to Intake Manifold	10-15
Fuel Pump to Cylinder Block	25-twoscore
Motor Mount to Cylinder Block	25-forty
Fuel Pump Eccentric and Timing Chain Sprocket to Camshaft	forty-55
Rocker Arm Comprehend to Cylinder Head	iii-5
Rocker Arm Shaft Bracket to Cylinder Head	25-35
Delcotron Bracket to Cylinder Head	65-80
Delcotron Bracket Brace	18-25
Delcotron Adjustable Mounting Bracket to Cylinder Head	25-40
Delcotron Mounting Bracket Thru Delcotron to Cylinder Head at Pivot Location	35-45
Starting Motor to Cake	40-55
Distributor Agree-Down Clamp	10-xv
Synchromesh Lower Flywheel Housing Plate	9-13
Flywheel Housing to Cylinder Cake	45-60
Fuel Filter to Cylinder Head	7-x
Buick Nailhead head torque pattern.

Buick Nailhead, 401

Buick Nailhead - Full general SPECIFICATIONS

General
	Wildcat 445 (400 & 401 Co. In.)	Mutiny 465 (425 Cu. In.)
Lawmaking Number Prefix	MR (400), MT (401)	MW
Export Code Number Prefix	MV	Not Available
Engine Type	xc° 5-8	xc° V-8
Bore and Stroke	four.1875 x 3.640	4.3125 x 3.640
Piston Deportation	400 & 401 Cu. In.	425 Cu. In.
Carburetor Blazon	4 Bbl.	4 Bbl.
Pinch Ratio	10.25:1	10.25:1
Gasoline Requirements	Premium	Premium
Brake Horsepower @ RPM	325/4400	340/4400
Maximum Torque @ RPM	445/2800	465/2800
Taxable Horsepower	56.xi	59.51
Octane Requirements - Motor	90	xc
Octane Requirements - Research	99	99
Cylinder Numbers - Front to Rear - Left Bank	ii-4-6-eight	two-4-6-8
Cylinder Numbers - Front to Rear - Right Banking concern	1-iii-five-7	1-3-5-vii
Firing Order	1-2-vii-8-4-v-six-3	one-2-7-8-four-5-6-iii

Piston and Pin Specifications
Piston Textile	Cast Aluminum Alloy
Type	Divorced Skirt
Finish	Cam Ground
Piston Pins
Fabric	Extruded SAE-1018
Type	Pressed in Rod

Connecting Rods
Length	6.220" (401/425)
Material	Forged - SAE-1141 Steel
Rod Bearing	Removable Steel Backed Thousand/400

Ring Specifications
#1 Pinch	Bandage Atomic number 26-Lubrited
#2 Compression	Cast Iron-Lubrited
Oil Control	Steel-Uncoated
Oil Ring Expander	Steel Humped Ring
Ring Locations	To a higher place Pivot

Crankshaft Specifications
Material	SAE-1145 or SAE-1053 Steel
Bearings	5 Replaceable Steel Backed
Begetting Material	#i, #2, #3, and #4 - Thou/400, #5 - 100A Durex
Bearing Taking Finish Thrust	#3
Deck Height	10.00

Camshaft Specifications
Material	Cast Alloy Atomic number 26
Bearings	Steel Backed Bobbitt
Number of Bearings	5
Bulldoze	Chain
Number of Links	52
Crankshaft Sprocket	Sintered Iron
Camshaft Sprocket	Nylon Coated Aluminum

Valve Specifications
Intake Valve Material	SAE 1041 Steel, 1047 or TS 8150 Steel
Frazzle Valve Material	GM-N82152 (21 - 4N)
Valve Lifter Mechanism	Hydraulic
Valve Bound	Single Helical

	Lubrication System Specifications
Type of Lubrication
Main Bearings	Pressure
Connecting Rods	Pressure
Piston Pins	Splash
Camshaft Bearing	Pressure
Timing Chain	Drip from Front Cam Bearing
Cylinder Walls	Splash & Nozzle
Oil Pump Type	Gear Driven
Normal Oil Force per unit area	40 Ibs. @ 2400 RPM
Oil Pressure level Sending Unit	Electrical
Oil Intake	Stationary
Oil Filter System	Total Flow
Filler Blazon	Throw-Away Chemical element & Tin
Crankcase Capacity
Less Filter	4 qts.
With Filter	v qts.

Cooling System Specifications
System Blazon	Pressure
Radiator Cap Relief Pressure	fifteen psi
Thermostat	Choke Type Opening at 180°
Water Pump Type	Centrifugal
GPM @ RPM	17 @ 1000
Bulldoze	V-Belt
Bearings	Double Row
By-Pass Recirculation Blazon	Internal
Cooling Organization Capacities
With Heater	eighteen.0 qts.
Due west/O Heater	17.0 qts.
With Air Conditioning	xviii.27 qts.
Fan Diameter and Number of Blades
Less AC	18" x 4
With Air-conditioning	20" x 5
Fan Drive
Less AC	Water Pump Shaft
With AC	Thermostatic Controlled Clutch

Stock piston from a 1966 425 weighs 720 grams plus the pin at 220 grams for a total of 940 grams and has a 30cc dome which measures about 5/16" high and about iii.645" diameter at it widest.