This Northstar engine was designed originally for transverse front-wheel drive applications. It was modified substantially in 2004 for longitudinal rear- and all-wheel drive use in the STS, SRX, and XLR, as well as receiving continuously variable valve timing on both intake and exhaust sides. The RWD (LH2) Northstar produces 320 hp (239 kW) and 315 lb•ft (427 N•m). An increased compression ratio of 10.5:1 enables most of the increase in power from the L37 and LD8 Northstars.
2004–2009 Cadillac XLR
320 hp (239 kW) @ 6400 rpm 310 lb•ft (420 N•m) @ 4400 rpm
- Production 2006 Cadillac XLR RWD LH2 4.6 VIN Code Y V-8
- Broadcast Code JBA
- 12577431 Production #
- 89017549 replaced by 19178925 Goodwrench # 2004 - 2009