[DeTomaso] 4-bolt Mains

[Corey Price]

I converted my block to 4-bolt mains just as Jack wrote but I had the main caps from a blown block already and they only needed a slight kiss by the hone to make the main bearing bores concentric and aligned. No boring was required.  The machinist charged $150 for the procedure in addition to align honing. Probably only worth bragging rights if anything. 

> On Dec 29, 2013, at 3:45 PM, jderyke at aol.com wrote:
> 
> Yes- 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. 
> ANY 351-C block can have 2-bolt-main caps replaced by 4-bolt main caps. 
> 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.
> 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. 
> 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.
> 
> 
> 
> -----Original Message-----
> From: Stephen Nelson <steve at snclocks.com>
> To: Detomaso <Detomaso at poca.com>
> Sent: Sun, Dec 29, 2013 9:27 am
> Subject: [DeTomaso] 4-bolt Mains
> 
> Did some of the Panteras come with 2 bolt mains?
> 
> Stephen Nelson
>  
> 
> 
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