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4 bolt mains

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SuperStockAMX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SuperStockAMX Quote  Post ReplyReply Direct Link To This Post Posted: Jan/25/2011 at 10:49pm
My guess is you have a very early '70 block as your probably confident it is not a '68-'69 block. Just goes to show there is nothing hard and true with mass production. 

Oil pan is not a problem with Pro-Gram caps. As I said, only the center 3 are 4-bolt. I ran all 5 as I wanted the superior metal across the board. But it is not necessary. 
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Rebel Machine View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Jan/30/2011 at 4:22pm
Snapped a couple of pics of the service block I have. Casting number is 3198951. According to The Red, White and Blue Book (by Frank Swygert) it is a '71-'78 401. There is also a casting number 448 7213 that is supposed to be a '70 390 service block. The R/W/B book doesn't list it.
 
Is this casting number a service block or did someone simply grind down the 401 on the side?
 
-Steve-
 
 
 
 
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390spirit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390spirit Quote  Post ReplyReply Direct Link To This Post Posted: Jan/30/2011 at 5:20pm
3195529 on my 70 390 block
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390spirit Quote  Post ReplyReply Direct Link To This Post Posted: Jan/30/2011 at 5:24pm
i just checked my 401 block and its the same as yours Steve 3198951 and i believe its a 1974 401
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Jan/30/2011 at 8:21pm
Does yours have the 401 on the side?
 
-Steve-
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17tamx View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 17tamx Quote  Post ReplyReply Direct Link To This Post Posted: Feb/01/2011 at 4:55pm
I have a late June 70 390 (306X25) in my 70 AMX and the rear casting number is the same as the 71 401. The block has the blank CID spots on both sides and the thicker webbing. When I pulled the motor apart and the seals and gaskets were factory AMC part numbered items including the head gaskets.
 
Anyone else out there with a late June or early July 70 390 engine that also didn't have the 390 CID cast into the side of the block?
Kirk P. Fletcher
70 AMX BBG w/Shadow 390 4sp
71 SC360 Wild Plum Ram Air 4sp
67 Rogue Convert 343 4sp
66 Rogue Hardtop 290 Auto
66 440 Convert 232 Auto
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