
Trenton Engine started out making V8 engines—9,858 of them in 1957 as production started. Straight-six engines were being made by then in the brand new, highly automated Mound Road plant; Plymouth needed serious mass production and low cost, so the new “A” series engines were also at Mound Road.
At Trenton, V8 production rapidly grew, with nearly 200,000 V8s pumped out for the 1959 cars; by now, the assembly plants were no longer trying to make engines (Canada did have a separate facility). (All years in this report are model years, not calendar years.)
The 1960 Valiant had spurred the creation of a new straight six engine at long last; the old flathead six was well and truly obsolete by this time. The engine created for the Valiant was not used in that car first, though; and it was available through the entire product line, save for the venerable Power Wagon, almost immediately. Trenton made 411,680 slant sixes in that first year, doubling production from the year before. But you can see it all in the chart:

See the wide chart...
 
See Trenton milestones and making V6 engines.
 Building Trenton Engine
Building Trenton Engine
to Make Classic V8s and Air Raid Sirens
 Building and Running the Slant Six Line at Trenton
Building and Running the Slant Six Line at Trenton
Making the legendary Leaning Tower of Power
 Making V8 engines
Making V8 engines
Trenton in pictures
 Trenton Engine milestones
Trenton Engine milestones
1964 Hemi to Pentastar
 Trenton Engine: Building New V6 Lines in 2000
Trenton Engine: Building New V6 Lines in 2000
A pictorial with explanations and stories
 Tales From the Factory: Matching Pistons and Blocks
Tales From the Factory: Matching Pistons and Blocks
How the factory managed precision problems, back in the day
 Trenton Engine 2025 Family Day
Trenton Engine 2025 Family Day
See inside the engine factory!
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