I am getting ready to do a slant six build and was trying to figure out if my engine has a forged or cast crank. It is right on the border of when they were changing over. Block code is 030-14 and stamping on other end of the block is 2775 which is what makes me think it’s a 75 engine. Block looks more like the later style than earlier to me, but I’ve read they were forged until mid 76. Is there a way to tell other than opening it up?

If only there were some sort of book that explained these sorts of things. Something that just covers the slant six would be ideal.
But, until you find one, look at the cast 'rib' on the outside of the block, driver side, behind the water pump. A thin, straight, horizontal rib indicates a cast crank engine.
If this rib is tapered (in thickness) it is a forged crank engine.
That sort of information should be in a book, maybe on page 20, but I am just dreaming...........
jus' sayin'

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-MattMan
LEANED & MEAN

Thanks that’s exactly the info I needed. Mine is a cast crank, I was able to look up some pics online and see the difference.

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1975 Dodge D100 225 c.i., HEI, Offenhauser Four Barrel Intake, Parallel-mounted 500 CFM Edelbrock, Split Cast Iron Exhaust, 904 auto, 9.25" 3.55:1

Lol!!.....
I don't have such a book, but if I did.................

[*]

(I had to...)



I did not have to post this image but this is cool and I want to make something like this out of all the old Mopar bumpers I have.
DD

I bought two! One for the library and one for the garage. Very detailed and well written!

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If it was easy, everybody would be doing it.

There used to be a guy here who ran around telling everyone they needed to used Ford pistons in just about any high performance engine because cast pistons would crack. I assume the same would apply to cranks.

What he said.

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-MattMan
LEANED & MEAN

I am assuming you meant forged? Anyway, it doesn't really matter. Cast cranks hold up pretty well on their own.

My good shortblock I got from Mike uses a light cast crank. The motor in the car now also is a cast cranker.

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Official Cookie and Mater Tormentor.

Well, he said Ford so who were we to correct him?

Then, there was the guy back in the 70's who thought those new 'Cadillac converters' allowed you to convert a Pontiac or Olds into a Caddy.

The pistons in my good shortblock have a Ford pin diameter, and one of my heads has small block Ford valves in it, so there is that I guess.

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Official Cookie and Mater Tormentor.

That is not the first time I have heard of this. What is so great about the Ford pins? Are they lighter or something?

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-MattMan
LEANED & MEAN

Smaller diameter and lighter. Smaller diameter can lead to being able to use a shorter, lighter piston.

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Official Cookie and Mater Tormentor.

I thought Ford pins were larger in diameter than those for a slant. I have them in one of my engines and I seem to remember that the rods had to be resized larger. There are more choices of thicknesses and lengths in Ford pins. I think Dennis's engine uses the pistons Mike used in my ill fated stroker motor and I think they had a .875" pin.

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If you didn't drive it there, it's not a street car.