Did the 340 really make 275hp?
I heard those were like 600 at RPM...wow!
The stock Boss 429 was a PIG.
The thing came with a mild hydraulic cam, and huge intake port sizes that only worked well at engine speeds over 6,000 rpm.
It wouldn't even TURN 6,000 rpm with the stock cam!
Horrible mismatch...
I had a good friend who bought a new one in 1970(?).... I think that was the year; might have been '69.
I wouldn't get out of its own way when it was stock.
Seriously...
From a Boss 429 web page: "One would think that the Boss 429 would have been a street terror- given its impressive specifications. At best, in stock form, it equaled the 428CJs performance. The usual after market bolt-on modifications were extremely effective on waking the engine up. But as far as Ford was concerned, there was no reason to promote this Mustang- it's only purpose for being was to get that monster engine homolugated."
They give 14.09 at 102.85 mph as Car Life's road test performance figures. My buddy's wasn't that fast...