boss 351????

[raven469]

hello, please someone help!! last august i tore the engine out of my 73 mach 1 and what i thought was a 351c turns out maybe a 71 351c BOSS , a friend pointed out the block number and the 4 bolt main and said be happy you have a very rare boss351, so since then im trying to make sure my block is a boss here is the block number i have

D2AE-OA

if any one can help please do and thank you for your time
vincent

[73 Mustang Boy]

Ford only made the Boss 351 in 71, if the motor in your car is not orginal there are a few ways to tell if it is a Boss. The Boss 351's had aluminum intake manifolds, dual vaccum advance on the distributor, dome top pistons, and beefier connecting rods. I think the Boss motors were the only ones to use a square carb mounting flange the rest used a spread bore design. Ford also used 4-bolt main blocks on the 351CJ during these years so you could have one of those.

[shovelnose]

I have a D2AE-CA listing here mabey it's CA instead of CO.

The D2AE-CA casting number is listed as 71-4V 351C.

Also it is listed as 72-74 351C Boss,71 CJ, HO and 72-74 4V 351's. They are all 4 bolt mains.

Either way it should be a good motor. Check the last 2 letters again the C could look like ab O.

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82 Mercury Capri 302, Comp. Cams, Tremec 3550, 3.73's, 12.8@106 N/A
Kevin's Capri
Kevin's Mustang

[This message has been edited by shovelnose (edited 10-16-2001).]

[thunderbolt]

shovelnose:
Where do you have that D2 casting number as a 71 boss 351 listed? I am not trying to be an *** here but D2 corresponds to a 72 and the boss 351 was 71 only item and should carry casting codes no later than D1. The 351 HO is reportadly a boss 351 with hydraulic cam instead of solid lifters (also a boss 351 indicator). This could have a D2 code as could any 73 engine components that had casting used in 72. However like you say, nothing wrong with these other motors, and likey good power.

[shovelnose]

thunderbolt:

This is just info from a photo copy of a BB ford book. It states thats the casting #'s are to the best of there knowledge and to measure when in doubt. I do not have alot of exp. with bb ford. I have just bought A 429 and I wanted to know what year it was, so I aquired those casting #'s from a book.

On a side note: I bought a 76 lincon 460. The heads were supposed to be D4(75-78), but they were D3(73-74), 5 less cc. You never know what they do with left over parts at the factory.

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82 Mercury Capri 302, Comp. Cams, Tremec 3550, 3.73's, 12.8@106 N/A
Kevin's Capri
Kevin's Mustang

[thunderbolt]

Shovelnose:
Point well taken with those left over parts. Forgot about that and lots of history with new model year mustangs getting left over previous model year parts.