CobraGT87 said:the Boss 302 was more like 350HP stock, insurance comp is why it was rated at 290.
The Boss 351 was really 440HP+, but once again insurance comps forced Ford to rate it low at 330HP. If one ever looks at the spec's on the 71 Boss 351, theres no way that motor only made 330HP.
Boss 429 another way underated motor,
67 427 WAY under rated
427 Cammer w/ 6' timing chain
and the list goes on.....
Scott
Huh......Wha.......Dude, what mythological musclecar era did you beam-up from??? First off, let's all remember that before 72-73, the big 3 measured horsepower TOTALLY differently than it is today, gross BHP vs. SAE net. Makes a HUGE difference, namely exhaust manifolds, full systems, accessories, airbox & filter, etc.etc..., identically as the engine sits in the car. There's no hard & fast rule or percentage of how the measurements will differ, but for example (I'll use a GM example, because in 1971 GM was publishing BOTH measurements for each motor offered), the 400 c.i. Pontiac 4-V was 300 h.p. gross, 250 net. This fact is so worn out, It's getting tiresome explaining it. So the Boss 302 in todays measurement would be somewhere (ballparking here) in the 240 h.p. range. Which is NOT underrated, because Boss 302's in TOP TUNE are not any faster than mid-to-high 14-second 1/4 milers, and I'm being generous (most of the mags back in the day couldn't crack the 15-second barrier, and don't come back with the "crappy tire" argument, a Boss 302 doesn't have enough flippin torque to spin a polyglass anyways). Anybody who's ever driven an original Boss 302 (which I have), knows that it's got good top end power, but no matter how you drive it, a new bone-stock '04 GT would spank it silly. 350 h.p.? Total B.S., not true. The Boss 351 WAS INDEED underrated at 330 h.p., but 440+ HP????? I don't care if you're talking gross or net, you're off your rocker. I owned a Boss 351. Stock and proper tune, it can bite into the 13's. One did a low 13 in an old mag back in '71, but that's still back in the days when ringers and magazines pulling aircleaners and bolting on slicks was commonplace. I'd say that a Boss 351 was an honest 360 h.p. gross, 300 h.p. net, which would place it mathmatically right where I said it would run in the 1/4. That's it. A new '04 Mach would run fender to fender with it, probably nipping it through the traps. Boss 429? That's my baby, sitting in the garage at home. 375 gross h.p. was just about spot-on back in '69, because they were undercarbureted, with a lame cam and restrictive exhaust. Swap the cam and the carb, bolt up headers, and you've got a 450+ h.p. monster, but stock, nope, just 375 gross, as-advertised. There's so much myth and legend about the "muscle car era" but the fact of the matter is that most of the legendary muscle cars didn't run any better than high 14's stock. But back then they were so easy to modify, that everybody did, hence the legend and myth as there were so many scary fast modded cars out on the street. Honestly, you could drive one of them new 6-banger Altimas that run high 14's to a Muscle Car show, and likely run 80% of cars there for pink-slips and come out on top