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<DIV>I was a gearhead in the 60’s.</DIV>
<DIV>My opinion is Ford added 4 bolt mains to clevelands to stop the chevy guys
from saying they had a 4 bolt engine and the clevelands originally were
not. The 350 chevy’s needed 4 bolts to keep them together the Ford’s 351C
did not.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=jderyke@aol.com
href="mailto:jderyke@aol.com">jderyke@aol.com</A> </DIV>
<DIV><B>Sent:</B> Sunday, December 29, 2013 3:45 PM</DIV>
<DIV><B>To:</B> <A title=steve@snclocks.com
href="mailto:steve@snclocks.com">steve@snclocks.com</A> ; <A
title=Detomaso@poca.com href="mailto:Detomaso@poca.com">Detomaso@poca.com</A>
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<DIV><B>Subject:</B> Re: [DeTomaso] 4-bolt Mains</DIV></DIV></DIV>
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color=black size=2 face=arial>Ye<FONT size=2>s- a few. All Panteras were
supposed to get the big-port 4V heads and 4-bolt mains in the blocks. But I've
seen a couple and heard of a few more that got 2-bolt main engines. No big deal
unless you have more than 500 bhp AND regularly spin the engine over 6500 rpms.
Then 4-bolt mains may help to keep the main bearings held down more tightly.
<BR>ANY 351-C block can have 2-bolt-main caps replaced by 4-bolt main caps.
<BR>1)-You'll first need to find a set of 4 bolt caps and the 20 bolts. They
were never available separately, so any you find will have come off a blown-up
or worn out block. Sometimes the vendors or big engine shops have sets available
for $125 or so.<BR>2)- add them to the block with the big bolts and using the
caps as drill guides, drill the ten extra bolt holes for the 3/8-16 SAE side
bolts to the proper depth. Then tap the holes you just drilled to 3/8-16 SAE
thread. <BR>3)- Take the block to a machine shop and have them line-hone the
main bearing bores with the caps installed and all bolts torqued to specs.
Replacing ANY cap on any block causes a minute misalignment of the cap, which
causes that bearing to not run perfectly true, so all three steps are necessary.
IMHO, not worth the trouble on a stock 351-C block.<BR></FONT>
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<DIV
style="FONT-SIZE: 10pt; FONT-FAMILY: helvetica,arial; COLOR: black">-----Original
Message-----<BR>From: Stephen Nelson <steve@snclocks.com><BR>To: Detomaso
<Detomaso@poca.com><BR>Sent: Sun, Dec 29, 2013 9:27 am<BR>Subject:
[DeTomaso] 4-bolt Mains<BR><BR>
<DIV id=AOLMsgPart_0_53ecb778-92a8-413c-a704-da61148143fd
style="FONT-SIZE: 12px; FONT-FAMILY: tahoma, verdana, arial, sans-serif; COLOR: #000; MARGIN: 0px; BACKGROUND-COLOR: #fff"><PRE style="FONT-SIZE: 9pt"><TT>Did some of the Panteras come with 2 bolt mains?
Stephen Nelson
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