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Cadillac OHV V8 (1964–1967) specs: 429 ci (7.0L) 8-cylinder, 4.13 x 4.00 in (104.9 x 101.6 mm) bore and stroke, 10.5:1 compression. Rated 340 hp, 1964–1967.
The Cadillac OHV V8 (1964–1967) is close to square: 4.13" bore against 4" stroke, within 3.2%, which splits the difference between a high-revving layout and a torque layout. The 4" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 53.6 ci (879 cc).
10.5:1 on iron heads is in the range that usually runs on pump premium; iron holds heat, so treat it as the less forgiving side of that range.
It is one of 7 engines in the Cadillac OHV V8 family, sitting between the 390 ci and 500 ci members. 4 factory variants share these dimensions, rated at 340 hp across 1964–1967.
| Displacement | 429 ci / 7 L |
|---|---|
| Bore | 4.13" |
| Stroke | 4" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.032 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-5-6-3-4-2-7-8 |
| Advertised HP | 340 hp |
| Years | 1964–1967 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1964 | gross | 340 * | 480 lb-ft * | — |
| 1965 | gross | 340 | 480 lb-ft | 10.5:1 |
| 1966 | gross | 340 @ 4600 | 480 lb-ft @ 3000 | 10.5:1 |
| 1967 | gross | 340 * | 480 lb-ft * | 10.5:1 * |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 1.032 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 53.6 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 1964 | 340 hp | — |
| 1965 | 340 hp | — |
| 1966 | 340 hp | — |
| 1967 | 340 hp | — |
2 factory vehicles, 1964–1967. Each year opens that model's engine table.