All BOSS Mustang's featured Semi-Hemispherical head designs. I believe that is where the Boss designation originates from.
The 302, 351C, and the 429SCJ were the motors offered in the Boss cars.
The Boss 302 was not a drag car in stock form. It was a Trans Am series racer, and it kicked the **** out of everything else on the track. They were conservatively rated at 290bhp (a joke). In reality those motors put out damn close to 400bhp stock. Not to mention you could get much more than that out of them pretty easy. They need gears, and they need hook. Due to the 2.21" intake valves on '69 models, and 2.19" valves on 70's they developed little power until after 4000rpm.
The Boss 351 is probably the least known of the Boss cars. The 351C Mach 1 came with the same motor as the Boss, it ripped off a 0-60 in 5.6, 1/4mile in 13.80@106mph according to Car Craft (I believe). The 351C is a monsterous motor. The early blocks can take 800hp from what I've read, and stock, I'd expect significantly beyond the 302's 400bhp. It was rated humerously at 335bhp.
The Boss 429 had a 60/40 weight distribution. It'll smoke the tires at 60mph. I'm not talking spin. I'm talking smoke. Laughably rated at 375bhp, estimates I've seen place it in the area of 500+. With horrible weight distribution because of the motor size, they ran slow in the 1/4 because of lack of traction. The motor was actually so huge they had to place the battery in the trunk. The heads alone weigh 120 lbs each. According to a couple articles I've read with an optional traction bar and full slicks they run 12's. Stock. Even though people may claim the cam hurt 'em, they didn't need any more power. They need more traction. I'm also pretty sure they came with a 780cfm carb.
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