All Small Six Block Spec Discrepancy

[TrickSix]

If I have one turn up locally, I'd like to pick up a spare block. To keep options open, I want one with the "dual" bellhousing bolt pattern. The specs page here talks about 4-bolt and 6-bolt bells. So, 6-bolt must be another name for the dual pattern? The specs page here claims that the 6-bolt pattern starts with the C6DE-A code castings. But in the Schjeldahl brother's book, their chart claims the dual pattern didn't start until the C8DE-B blocks. Which is correct? Also, my car is a late '66 example, and has a C6DE-B block number, which isn't on either list. That's not a problem for me, just curious.

 

[drag-200stang]

I can assure you that that C6 blocks are Duel/6 bolt pattern and 7 main. Not that with Ford, anything is always 100%. Yes duel=6 bolt.
But there is the late model Big Bell with the 2/3rds small block V8 bell pattern that is also 6 bolt.

 

[TrickSix]

Thanks!

 

[powerband]

"DUAL DRILLED" block , note block deck and Toploader BH is right at cyl head gasket
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Single small pattern block - C5xx, note the space between Block Deck and the smaller Bellhouse which is down lower.

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oddly enuff' The 'Dual Drilled" block scheme originally fit small manual tranny and small 2spd air cooled automatic. When the small sixs' started using the bigger C4 3 spd auto', it used a unique small pattern C4 bellhouse and TC for the small six. The small pattern automatic bellhouse was then used thru late 70's.
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'76 Comet 200/C4
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hav fun

 

[TrickSix]

And another thank you!

 

[TrickSix]

I just brought a mirror and a light to bear on the back of my block. And now that I know what I'm looking at it's easy to see it's a dual pattern block. Thanks again! I'll always keep my original engine and trans together. But I'm building up a parts pile for whoever winds up with my car after me. Maybe if they can keep busy with some six-cylinder projects they won't stuff in a V8. I've got a big valve large log head with some porting done to it, now I need a block. I figure that higher revving engine should get a manual transmission, and that's easier with the dual pattern block. Now to deploy some patience and see what may come my way. I didn't look hard but kept my eyes open for a while, and in the past four or five years I've bought four large log heads locally for a total of $220. The most expensive one, $100 from a yard, had cracks and I returned it. I'm hoping to get the E0 hex-log head on my engine later this summer so I can retire the original head while it's still good. It's getting harder to find the good days when I can get some work done though...