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Chrysler Slant Six 1-bbl specs: 225 ci (3.7L) 6-cylinder, 3.402 x 4.13 in (86.4 x 104.9 mm) bore and stroke, 8.4:1 compression. Rated 85-90 hp, 1978–1983.
The Chrysler Slant Six 1-bbl is undersquare — the 4.1299" stroke exceeds the 3.4016" bore by 17.6% — a layout that trades peak RPM for leverage and torque low in the range. The 4.1299" stroke puts mean piston speed at 4,000 ft/min around 5,800 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.622 is in the range most production engines fall in. Each of the 6 cylinders displaces 37.5 ci (615 cc).
8.4:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Chrysler 225ci family, all of them 225 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions, rated from 85 to 90 hp across 1978–1983.
| Displacement | 225 ci / 3.7 L |
|---|---|
| Bore | 3.4016" |
| Stroke | 4.1299" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 8.4:1 |
| Rod length | 6.699" |
| Rod ratio | 1.622 |
| Bore/stroke ratio | 0.824 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-5-3-6-2-4 |
| Advertised HP | 85–90 hp |
| Years | 1978–1983 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1980 | E25 net | 90 @ 3600 | 160 lb-ft @ 1600 | — |
| 1981 | net | 85 @ 3600 | 165 lb-ft @ 1600 | 8.4:1 |
Factory specification sheet.
| Bore/stroke character | 0.824 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,130 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.622 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 37.5 ci |
| Static compression | 8.4:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1978 | — | Slant Six 1-bbl |
| 1979 | — | Slant Six 1-bbl |
| 1980 | — | Slant Six 1-bbl |
| 1980 | 90 hp | Slant Six 1-bbl |
| 1981 | 85 hp | Slant Six 1-bbl |
| 1982 | 90 hp | Slant Six 1-bbl |
| 1983 | — | Slant Six 1-bbl |
| 1983 | 90 hp | Slant Six 1-bbl |
9 factory vehicles, 1968–1983. Each year opens that model's engine table.