351 Mustang

just got a 351w differences?

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Old Aug 13, 2007 | 10:50 AM
  #1  
x6x6x7x's Avatar
x6x6x7x
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Default just got a 351w differences?

came out of an 80 something box van is there any differences in the years that they made them
Old Aug 13, 2007 | 11:04 AM
  #2  
AdderMk2's Avatar
AdderMk2
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From: Lil' Rhody
Default RE: just got a 351w differences?

https://mustangforums.com/m_3617604/tm.htm


anything after 74 is a waste. the 75+ blocks had a thin main web, and inferior metal composition.

you should try to get one thats a bit older... like 69-74
Old Aug 13, 2007 | 12:29 PM
  #3  
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Default RE: just got a 351w differences?

although i think 75+ had one piece rear main seals
Old Aug 13, 2007 | 02:11 PM
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Default RE: just got a 351w differences?

Anything after 74 is not a waste. 71-79 were pretty much the same block, but regardless it is still stronger than a 302. Jasper i have a 78 351 block that was a 2 piece rear main, i say was because i had it machined for a one piece. I am not really sure when they converted to a one piece.
Old Aug 14, 2007 | 12:21 AM
  #5  
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Default RE: just got a 351w differences?

ORIGINAL: FASTBLACK

Anything after 74 is not a waste. 71-79 were pretty much the same block, but regardless it is still stronger than a 302. Jasper i have a 78 351 block that was a 2 piece rear main, i say was because i had it machined for a one piece. I am not really sure when they converted to a one piece.
what did it run you to have it machined and what are the benefits of 1 piece rear main seals?
Old Aug 14, 2007 | 07:04 AM
  #6  
MadMan@TheWheel's Avatar
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Default RE: just got a 351w differences?

I
Old Aug 14, 2007 | 10:01 PM
  #7  
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89Ford
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Default RE: just got a 351w differences?

i think they are less prone to leak and are easier to change
Old Aug 15, 2007 | 07:46 AM
  #8  
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WhiteWindsor
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Default RE: just got a 351w differences?

The machine work to convert to a one piece cost $125. Yes, they are less prone to leaking and are easier to change. With a one piece you just drop your tranny. With a 2 piece you have either drop your tranny and raise your engine so you can drop oil pan or just unbolt tranny and pull motor.
Old Aug 21, 2007 | 10:29 PM
  #9  
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Hurricanedt77
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From: Warwick, RI
Default RE: just got a 351w differences?

I just went through a rear main seal dilema with my 84 351W. Go with a 1 piece, or have the block machinened to accept it.
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