Bore, stroke, displacement and compression for all 4 Cadillac Blackwing engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 217–256 ci |
|---|---|
| Cylinders | 6, 8 |
| Bore | 3.386–3.701" |
| Stroke | 3.370–3.563" |
| Compression | 9.4–9.8:1 |
| Advertised power | 464–550 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| LTA | 256 ci | 3.3858" × 3.5512" | 9.8:1 | 550 |
| 42TT LTA | 255 ci | 3.3858" × 3.563" | 9.8:1 | 550 |
| LTA | 255 ci | 3.3858" × 3.5433" | 9.8:1 | 500–550 |
| LF4 | 217 ci | 3.7008" × 3.3701" | 9.4:1 | 464 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
The family mixes oversquare and undersquare designs, so members behave quite differently despite sharing a name.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.