Chrysler Flathead 6 Cylinder Engines 1935-1959 Part 2

Previously, we touched on a few variations in design, but there are plenty more. Almost all flathead engines had aluminum pistons with a 4 ring design; the top two being compression and the bottom two oil control. From 1935 through 1940 both compression rings were 1/8 inch thick (.125”) and the oil control rings were 5/32 of an inch (.15625”). In 1941, the top compression ring was changed to 3/32 of an inch (.09375”). In 1942, both compression rings were changed to 3/32. This configuration was used through 1959 in the US. Foreign built cars had some exceptions to this. Read More

Gaskets at Andy Bernbaum

Chrysler Flathead 6 Cylinder Engines 1935-1959 Part 1

From 1935 through 1959 Chrysler passenger car flathead 6 cylinder engines developed a reputation for durability. They looked similar, but went through several changes along the way. For our purposes we will concentrate on the Plymouth and Dodge engines (PD) and the 1937 through 1954 Chrysler and DeSoto engines (CD). The PD engines are both 23.5” long, as measured at the head. 1935 through 1941 Plymouth engines had a bore of 3.125” for a displacement of 201 cubic inches. The Dodge engines throughout had a bore of 3.25” as did the Plymouth engines from 1942 though 1959 giving either 218 Read More


How to read original Mopar parts books

Original parts numbers can be quite useful. In this day of Ebay, original part numbers can make the difference in finding the exact part that you need. Maybe the seller only has the part number without knowing the correct application. Factory Parts Books are broken down into several different sections. Let’s use a 1960 Parts Catalog as an example. Section 2 deals with front suspension. Let’s look up the lower ball joint for a 1960 Plymouth. From the picture below, you see it is listed as Ball Joint 2-10-55. The number is called the Part-Type Code and it tells us Read More

Evolution of Chrysler, Dodge and DeSoto Hemi Engines

Everything you want to know about Fluid Drive

One of the questions we get asked frequently here at ABAP is HOW to drive the Fluid Drive equipped cars. We understand the confusion as the Fluid Drive equipped cars don’t drive like a standard shift, don’t drive like a modern automatic, and to make it all more confusing, different cars in the Chrysler line up were operated differently, and the different car lines used different “brand names” for their Fluid Drive set ups! What could possibly go wrong! First a little background Chrysler Corp rolled out the FLUID DRIVE coupling on 1939 Chryslers. In these early cars the Fluid Read More