Not rear wheel horse, engine horse. On an ERA with Jag IRS figure 12% drive train loss, LESS for a live axle like I THINK were talking about here. Any yes, STILL enough vacuum for power brakes (just drive faster,
).
12% of 454 = 54 Perhaps 10% with a straight axle, 45 horse?
385 horse falls short, but not by "that much"? Hey, is this GT-500 running an automatic trans?