[jean-marc]

hi, i'm new and from belgium. Some time i'm looking to buy a classic mustang. I was offered a 1971 boss 429 today. i can not find a lot of info about this car, i don't know if its genuine. can anyone tell me if it could be correct: a ford mustang, '71, boss 429 with 450 hp. thanks a lot

[1mach1]

Hello, and welcome to the site. Ford did not offer a Boss 429 for 1971. The Boss 429 was only available in 1969 and 1970. For 1971, Ford offered a Boss 351. The 429 (non-Boss engine) was available in the 1971 model year, but only for a few months. You could get the 429 in any body style, but no Boss 429. Below are the engines offered for the 71 model year:

250cid 1V 6-cyl 145 hp L Code
302cid 2V V-8 210 hp F Code
351cid2 V V-8 240 hp H Code
351cid 4V V-8 280 hp Cobra Jet Q Code
351cid 4V V-8 285 hp M Code
351cid 4V V-8 330 hp Boss R Code
429cid 4V V-8 370 hp Cobra Jet C Code
429cid 4V V-8 375 hp Cobra Jet J Code

[jean-marc]

thanks for the info. you wouldn't know here i can fid pictures of the '71 429 model to compre with the car?

[1mach1]

Sure....Check out this site. It is all '71 429 cars!

71 429 CJ Mustang and Cougar Megasite

[pushrodpower]

The Boss 429 engine has very distinctive valve covers and you'll know one when you see it. Here's a link to a pic of the Boss 429.
Image:Boss 429.jpg - Wikimedia Commons

[RedGTvert]

Doesn't take much to be able to identify a B9, just look at the huge heads and the plugs going right through the middle of those huge heads.

[andrewmp6]

In 71 there is a 429cj and 429scj only boss mustang made in 71 is the 351.Get the vin and if the door tag is still there all the info from that decode it here Classic Mustang Decoder people lie vins don't.