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4 bolt mains |
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bulletpruf 
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Joined: Oct/06/2008 Location: San Antonio, TX Status: Offline Points: 1405 |
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 Posted: Jan/23/2011 at 10:21am |
Not mine. Belongs to a friend.
Block was stamped RP 357 011 (Roger Penske, 357", 11th engine built) or something like that. Built by Traco.
Scott
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Please check out my YouTube channel for vintage car and truck shenanigans! https://www.youtube.com/@THEBULLETPROOFGARAGE
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Rebel Machine
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Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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Posted: Jan/23/2011 at 2:36pm |
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I was thinking of the casting number usually located at the back of the block on the driver's side.
-Steve-
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bulletpruf
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Posted: Jan/23/2011 at 3:25pm |
Not sure what the casting # is; he never sent me a picture of that.
Scott Edited by bulletpruf - Jan/23/2011 at 5:15pm |
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Please check out my YouTube channel for vintage car and truck shenanigans! https://www.youtube.com/@THEBULLETPROOFGARAGE
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SuperStockAMX
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Joined: Dec/29/2009 Location: Anthem, Arizona Status: Offline Points: 237 |
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Posted: Jan/25/2011 at 5:11pm |
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The 1970 390 & 401's have the wide webbing which will accommodate the 4-bolt main conversion. There is also a service block sometimes referred to as the T/A block, sometimes referred to as a Mark Donohue block which was machined to 360 bore with the wide main cap webbing. The dealer (or factory) could use this as necessary; 360 - 390 - 401.
Pro-Gram and Milidon produce after market 4-bolt main caps.
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amc37643
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Joined: Jun/02/2010 Status: Offline Points: 91 |
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Posted: Jan/25/2011 at 6:31pm |
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Anyone familiar with the # that would be on the block to designate a block with the wide webbing that would accept machine work for 4 bolt mains & its location on the block? someone on a earlier post said something about it being on the rear of the block,just trying to save disassembly to check cant remember a tag on V.C.on this 401 supposibly from a AMBASSADOR
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SuperStockAMX
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Joined: Dec/29/2009 Location: Anthem, Arizona Status: Offline Points: 237 |
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Posted: Jan/25/2011 at 6:55pm |
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If it is a 1970 390 or 401 (any year), it has the wide webbing. The 360 service block is the only exception. It will not have an engine size cast into the side of the block (behind the motor mount).
There may be some exceptions with the service block but your question is more geared to the 401 you have. I have the Pro-Gram mains and bought all 5. You can elect to go with the center three if you prefer.
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amc37643
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Posted: Jan/25/2011 at 7:15pm |
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Are there any oil pan conflicts on the rear of the engine if all 5 are installed?,any other mach.work other than drill & tap for extra bolts & line bore block with new caps required?
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poormansMACHINE
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Posted: Jan/25/2011 at 7:22pm |
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The blocks aren't machined flat where the additional bolts locate so add that to shop work.
Pan shouldn't interfere since the caps aren't that tall. |
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SKeown
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Posted: Jan/25/2011 at 7:38pm |
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The front & rear caps are still two bolt, only the three center are four bolt.
SKeown
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crossramrambler
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Joined: Dec/13/2008 Location: Reno,Nv Status: Offline Points: 494 |
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Posted: Jan/25/2011 at 10:38pm |
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Here is a picture of my 70 390 with pro gram 4 bolt mains. It does not have the wide webbing like the 401 block......Jim.
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Rebel Machine wrote: