Specifications

Stock Model A & B Camshaft Grind Specifications
By Marco Tahtaras

The following is for original NEW Model A and B cams only Regrinds will have substantially different characteristics regardless of what they are called.

The Model A cam was ground as follows: Lobe Lift = 302" Valve lift = 289" @ 013" clearance duration @ valve seat to seat = 236 crankshaft degrees @ 015" clearance Lobe centers = 112 crankshaft degrees Intake center = 110 5° after TDC Intake opens = 7 5° before TDC Intake closes = 48 5° after BDC Exhaust opens = 51 5° before BDC Exhaust closes = 4 5° after TDC

The Model B cam was ground as follows: Intake lobe lift = 334" Intake Valve lift = 319" @ 015" clearance Exhaust lobe lift = 341" Exhaust Valve lift = 319" @ 022" clearance duration @ valve seat to seat = 244 crankshaft degrees @ above clearances Lobe centers = 114 crankshaft degrees Intake center = 114° after TDC Intake opens= 8° before TDC Intake closes= 56° after BDC Exhaust opens= 56° before BDC Exhaust closes= 8° after TDC

Rear Frame Stampings

Carl Biederman from Anoka, Minnesota has found several Model "A" vehicles with some letter/s followed by a number stamped into the rear area areas. The locations of the stampings have been noted on the rear end axle housing, top of the rear frame cross member and the right rear corner of the rear frame cross member (see picture below from Eldon Frisk).

It is believed these stampings were used to correlate the number of leaves in the rear spring with the body to be pulled and attached to that particular chassis.

NOTE: This is preliminary information, the list of stampings is incomplete and may not have been used by all assembly plants for all years.

Following are the stampings noted to date with their interpretations:

 

Stamping	Body Style	Rear Spring Leaves
R7	Roadster	Seven leaves
C8	Coupe	Eight leaves
OCPU0	Open Cab Pickup	Ten leaves
T0	Tudor	Ten leaves
TS0	Town Sedan	Ten leaves
FD0	Fordor	Ten leaves