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New Model A Engine Builders Guide 30 March 2023

Doubling the Flow Area of a Model A Oil Pump 20 December 2022

Installing an Oil Filter 31 January 2021

The "Builders Guide" has been revised and the latest revision dated 30 March 2023 has been released and includes the following changes:

• Section 5), Recommendations Regarding Adhesives and Sealants, Added a warning about using acetone instead of kerosene, diesel, paint thinner, or other oily solvents to clean surfaces where sealants, adhesives, and epoxies will be applied.

• Section 7), Oil Passage Plugs, Added pictures and a description of a button head screw and washer from McMaster Carr that can be used as a rear main oil galley plug for those not building an engine for a "points car".

• Section 7), Main Bearing Studs, Replaced a photo with a drawing showing the o-ring groove in the main bearing studs for mains 1 & 3 that could be used with a Viton o-ring for sealing the studs to the cylinder block. The drawing dimensions are in mm.

• Section 7), Pistons and Rings, Added a sentence that the "New Engine" cylinder wall cross-hatching is correct for thin piston rings and the cylinder wall cross-hatching should be coarser if the original wide piston rings are chosen.

• Section 7), Valves, Added a picture of a valve showing the correct location and width of the contact area where the valve face meets the valve seat.

• Section 7), Valves, Added a paragraph about using exhaust valve rotators for extended life along with part numbers.

• Section 7), Head Gaskets, Recommended the Best 509C head gasket for heads that are not flat.

• Section 12), Optional Flywheel, Added pictures of the not recommended tractor 8N-7563 and the recommended V-8 Ford 09A-7563 pressure plates.

• Section 12), Optional Flywheel, Added a source for the new 09A-7563 pressure plates that are $69 and correctly balanced.

• Section 12), Optional Flywheel, Added a paragraph regarding pressure plate attachment bolts including problems with ARP and Pioneer bolts.

• Section 18), Education, Resources, and Making a Decision, Additional builders have been added and more information about current builders has been added.

• Several other minor changes were made for clarity.

The "Builders Guide" is an evolving document and I ask engine builders with comments to contact me at model.a.engine@hotmail.com so their comments can be used to improve the "Builders Guide".