Expert: Brad Sears - 7/23/2010

Question
What is the point gap on a 1947 Plymouth Deluxe that has a Flathead 6 cyl

Answer
Set the points at .020". and here are sme more specifications.
GENERAL SPECIFICATIONS
Model Designation: Six Cylinder
    De Luxe 6 - P15S
    Special De Luxe 6 - P15C
Wheel base: 117
Valve Location: In block
Bore and Stroke: 3-1/4 x 4-3/8
Piston displacement, Cubic Inches: 217.8
Compression ratio: 6.60
Maximum Brake Horsepower: 95 @ 3600 RPM
Maximum Torque Lbs.Ft. @ RPM: 172 @ 1200
Normal Oil Pressure Pounds: 40
TUNE UP SPECIFICATIONS
Spark Plug Make: Auto-Lite A5
Spark Plug Gap, Inch: .025
Firing Order: 153624  
Ignition Timing: TDC. Timing mark: Vib. Damp.
Engine Idle Speed, RPM:  475
Cylinder Head Torque Lbs.Ft.: 70
Compression Pressure & Cranking Speed: 120 Min.
PISTON AND RING SPECIFICATIONS
Fitting Pistons with Scale:
Removed from above
Piston fitted properly when it has slight drag in the bore, yet is free enough to fall slowly through of its own weight with parts clean and dry.  
Rings: (Fit rings in tapered bores for clearance shown in tightest portion of ring travel.)
Compression: .012; Oil: .012
Clearance in groove: Compression: .002-.004; Oil: .001-.0025
Wristpin Diameter, Inch: .8591-.8593
VALVE SPECIFICATIONS
Operating Clearance:
    Intake: .010 Hot  Exhaust: .010 Hot
Clearance for timing Intake: .014
Valve Seat Angle, degrees: 45
Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
        Intake opens: 12 degrees BTDC
        Exhaust Closes: 6 ATDC
Valve Spring Pressure Pounds at Inches Length:
    Spring: 40 @ 1-3/4
Valve Stem Clearance:
   Intake: .002
   Exhaust: .004
ENGINE BEARING SPECIFICATIONS
Connecting Rod Bearings:
   Journal Diameter, Inches: 2.0615 - 2.0625
   Bearing Clearance, Inch: .001-.0015
   Rod End Play, Inch: .006-.011
   Rod Bolt Tension, Lbs.Ft.: 45-50
Main Bearings:
   Journal Diameter, Inches: 2.499-2.500
   Bearing clearance: .0005-.0015
   Shaft End Play: .003-.007 (Thrust taken by rear bearing)
   Main bolt tension, Lbs.Ft.: 80-85
CAPACITY DATA
Cooling System:
   Without heater: 15 quarts
   With heater: 16 quarts  
Fuel Tank: 17 gallons
Engine Oil: 5 quarts
Transmission: 2-3/4 pints
Rear Axle: 3-1/4 pints
AUTO-LITE DISTRIBUTOR SPECIFICATIONS
Distributor part number: 1GS-4207-1 (distributor rotates clockwise)
Cam Angle, degrees: 39
Breaker Point opening, Inch: .020 Plus or minus .002
Condenser Capacity: .25-.28 Mfds.
Breaker Arm Spring Tension: 17-20 Oz.
Centrifugal Advance: (degrees at RPM of distributor)
  Advance starts 1 degrees @ 370
  Full Advance: 9 degrees @ 1300
Vacuum Advance Data:
  Degrees @ Inches of Mercury:
      Advance starts: 1 @ 6
      Full Advance: 10 @ 14
AUTO-LITE GENERATOR SPECIFICATIONS
Generator Number: GDZ-4801A (generator rotates clockwise, 6 volts, Positive Ground)
Generator output: 35 @ 2000 RPM
Brush Spring Tension: 35-53 oz.
Field Current: 1.3 - 1.5 at 5 volts
AUTO-LITE REGULATOR SPECIFICATIONS
Regulator Number: VRP-4503A
Cutout Relay:
   Voltage to close points: 6.5
   Reverse current to Open Points (Amps): 4-6
   Armature Air Gap: .031
Voltage Regulator Setting: 7.3 volts
Current Regulator Setting: 35 amps
Current and voltage armature air gap, Inch: .048
AUTO-LITE STARTING MOTOR SPECIFICATIONS
Part number: MZ-4133 (starter rotates clockwise)
Bush Spring Tension, Ounces: 42
No Load Test: 68 amps, 5.0 volts @ 4000 RPM

Torque Test: 280 Amps, 2.0 volts, Torque, Lbs.Ft.: 4.4
ENGINE TIGHTENING SPECIFICATIONS (FT. LBS.)
Spark Plugs: 26-32
Cylinder Head Bolts: 65-70
Connecting Rod Cap Bolts: 45-50
Main Bearing Cap Bolts: 80-85
Flywheel to Crankshaft: 55-60
WHEEL ALIGNMENT SPECIFICATIONS
Caster, Degrees
   Limits: -1 to + 1
Camber, Degrees
   Limits: 0 to +3/4  
Toe-In, Inches: 0 to 1/16
Toe-Out on Turns, Degrees: (If toe-out is incorrect, when other adjustments are correct, look for bent steering arms.)
   Outer wheel: 20
   Inner Wheel: 22