Whats The Best 347 Block?

[65FBE2]

I have a 347 that has a terminal oil leak. The engine builder suggests a different block. I currently have a D1 block. I need to get something at the junk yard as I can not afford a Mexican or Boss block. What year did Ford start with the one piece seal? If I use a roller block, can I use a solid flat tappet cam? Reason is I need to save money and use the parts I currently have. It is a 5 speed tranny. I heard at some point Ford stopped putting the boss on the block for the clutch equalizer bar. How do we get around this?

 

[silver66pony]

My 351 w block is a 1984 it did not have a hole for the z bar i had to drill and tap it out works just fine now

 

[coolblue65]

There is also a small bracket you can use instead of drilling and tapping the hole, I used it on my 347.

 

[10secgoal]

Can't remember, but someone makes a bracket that bolts on with the tranny to adapt the stud for the Z-bar.

 

[65FBE2]

What year did they start with the one piece seal? If anyone is interested, I have a set of RHS 200 heads for sale CI 64cc .560 max lift New in box

 

[brianj5600]

Are you saying the main saddles are cracked? I thought the roller blocks were the weakest.

 

[D.Hearne]

Look for a D8VE 302 block. This one's thicker all over like the Mex block, just has the smaller std main caps of the regular blocks. Not a big deal if you're going to use a main girdle anyway. If you're going to a roller block, skip the 85 castings and look only at the 86-2001's.

 

[JR4 Motorsports]

What is making the oil leak "terminal"?

 

[65FBE2]

"Terminal" only in that I have replaced it for the third time in the car and can not fix it so I pulled the motor to find this problem. Could it be the crank? Are the stroker cranks the same or is there a differents in the rear main area? Slinger?

 

[65FBE2]

Just took the motor apart and found nothing that looks like it is causing the problem BUT. I used a cast crank from CHP and I have no ideal why this happened. The end play was way over the limit. So I removed the thrust bearing cap and found the crank severly worn. The motor only has 2000 miles on it. I don't think this was the cause of the leak, any ideals as to what happened?

 

[D.Hearne]

Just took the motor apart and found nothing that looks like it is causing the problem BUT. I used a cast crank from CHP and I have no ideal why this happened. The end play was way over the limit. So I removed the thrust bearing cap and found the crank severly worn. The motor only has 2000 miles on it. I don't think this was the cause of the leak, any ideals as to what happened?

The leaking seal can and most likely is caused by the walking crank. Looks like you're needing both a block and crank to start over with. And if you're running an automatic trans, check to see if there's too much presssure in the torque converter, that'll force the crank against the thrust bearing and cause premature wear.