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A friend and I were talking about this and none of us knew the difference between a Boss 351 and a 351 c4v. Does the same apply to the 302 and 429 engines? Just curious about it.
 

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Okay, I don't want to tell any lies so I'll let the experts differentiate, however, I believe (to my recallection) there were some Boss 302's in the '70 FB Stangs. Better wait for more expert advice. I have my own beliefs but they could be unfounded.
 

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the difference between the 351-4V and BOSS 351 aren't as extensive as the 302 vs. BOSS 302 or 429 vs. the BOSS 429. the 351s vary mainly in the valve train and the accommodating modifications to the heads.

I did a search for "what makes a BOSS' over the last year and found a dozen or more threads, but here's two:

difference between 302 and boss 302?

and

302 vs. Boss 302
 

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In 1970 there were 7014 Mustangs that left Ford with the G code BOSS 302 motor. There were 7013 BOSS 302 Mustangs and 1 shelby Mustang that had a BOSS 302 motor. Other than some of the Cougar Eliminators no other Ford produced vehicles came with a G code BOSS motor.
 

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Goldenboss, you're so cool. I knew some gifted person of expertise would pipe up for this question. I love this site.
 

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Uhhhh.Arent we forgeting the 1969 Boss 302?
 

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as Tom pointed out, the differences between the Boss 351 and "regular" 351-4V weren't as dramatic as the differences between a standard 302 vs Boss 302 and a standard 429 vs a Boss 429. The boss 351 used a 4 bolt block with a high nodular iron crankshaft as opposed to the 2 bolt main block and standard cast iron crankshaft in the 351-4V. Also the 351-4V had non-adjustable rockers where as the Boss 351 ran a fully adjustable rocker valvetrain in conjuinction with a solid lifter cam. The Boss 351 also had a unique aluminum intake plus a few other goodies that set it apart from the 351-4V.....

The Boss 302s and Boss 429's shared very little with their cousins, except maybe in dimensional sizes of the blocks. Both came equiped from the factory with 4 bolt mains, forged steel crankshafts, high nickel content blocks with screw plugs and special heads and valvetrain that made them so BOSS....

randy
 

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Jim, I didn't mention the 69 BOSS count as my response was inregards to BOSS HOSS comment about 70 Mustangs. There were 1628 69 BOSS built along with how many BOSS Cougar Eliminators were produced also. Please forgive me and accept my deepest apolidies for failing to mention the 69 BOSS counts.
 

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No biggie. /forums/images/icons/smile.gif I meant to go back and explain the difference between the Boss and the 302W but I see Randy posted and I sure he covered everything
 

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Hey Randy, wasn't the 4-bolt main block also in the early 4Vs
 
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A bought $25,000.00 difference if you go to buy them. Dont know the difference
 
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