Model "B" Engine Differences

[Bob Bidonde]

In 1932 an “Improved 4-Cylinder Engine” was introduced for cars and trucks, and it remained in vehicle production through 1934. Buyers had a choice of the Improved 4-Cylinder engine or the new V8. The “Improved 4-Cylinder Engine” is designated as the Model “B” Engine, Part Number B-6005. The question arises, “What are the differences in the Model “B” engine versus the Model “A” 4-cylinder engine?” The following is an overview of the changes:
· Pressurized oil supply to the main and camshaft bearings;
· Larger diameter main and connecting rod bearings;
· Larger venturi carburetor with a power jet & transversely mounted float;
· Carburetor oil bath air filters B-9625 & BB-9625 available thru service;
· Intake manifold with larger internal diameter;
· Slightly higher compression ratio cylinder head;
· Lighter flywheel;
· Improved camshaft;
· Front engine cover with timing pin offset so timing is 19 Degrees BFTDC;
· Distributor with an ignition timing adjustment for gasoline quality (octane);
· Distributor with centrifugal timing advance;
· Distributor cam with smoother transitions to lobes;
· Distributor body with 1/8” decreased notch height;
· Mechanical fuel pump;
· Larger water pump impeller;
· 3-bolt water pump attachment;
· C4 Champion Spark Plugs with 0.030” gap;
· Larger diameter B-6763-B oil filler pipe;
· Thin-wall cylinder block casting technology;
· Different exhaust manifold shape;
· Oil pump with undercut shaft for increased oil flow;
· SAE oils with a 1000-mile engine oil change interval;
· Elimination of oil return tube;
· Valve chamber with pressurized galley & larger valve cover;
· Oil pan with flywheel housing attached & outward indentations in its sides to clear connecting rods.