LY7 The 3.6 L; 217.5 cu in (3,564 cc) LY7 engine was introduced in the 2004 Cadillac CTS sedan. It has a 10.2:1 compression ratio, a bore and a stroke of 94 mm × 85.6 mm (3.70 in × 3.37 in). Lower powered versions only have variable cam phasing on the inlet cam (LEO). Selected models also include variable exhaust. The engine weighs 370 lb (170 kg) as installed. The LY7 has a lower compression (10.2:1 vs 11.5:1) but sequential port injection. Unclear what models have VVT, but it seems that some do not. Still less than 400lbs, so 250hp is still obtainable without the DI or VVT.