If you're talkin modern power,BMW or maybe the Supra.Talkin a pretty engine,the old Jaguar DOHC engine.Stock low power durability? any US built inline 6.The last of them being the recently departed Jeep Cherokee 4.0,the old AMC lump,probably the most powerful US made regualr production OHV 6 at about 190 real HP?

70 Triumph 650 cc ECTA current record holder