just got a 351w differences?

x6x6x7x · 08-13-2007, 11:50 AM

came out of an 80 something box van is there any differences in the years that they made them

AdderMk2 · 08-13-2007, 12:04 PM

http://www.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

Jasperstang308 · 08-13-2007, 01:29 PM

although i think 75+ had one piece rear main seals

WhiteWindsor · 08-13-2007, 03:11 PM

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.

Jasperstang308 · 08-14-2007, 01:21 AM

Quote:

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?

MadMan@TheWheel · 08-14-2007, 08:04 AM

89Ford · 08-14-2007, 11:01 PM

i think they are less prone to leak and are easier to change

WhiteWindsor · 08-15-2007, 08:46 AM

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.

Hurricanedt77 · 08-21-2007, 11:29 PM

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.