[Wolfplace]

Houston I have a problem...Ive run into a casting number of 387000 ......even if the the 8 is a 9 like 397000 I cant find it......looks to be a 8 though...

Ive looked for it on the Mortec sight but it isnt there.....it is supposed to be a 400SB, but It doesnt have the bulges in the sides and it doesnt have a notched ballancer.....Im confused....any help would be appreciated..

It was in a 77 3/4 ton Surburban matched with a 400 turbo tranny. ..it has a quadrajet carb on it as well.

Thank you in advance for any help. Remy

If it does not have the bulges at the cylinders it is not a 400
If it does not have the "notched" damper & is stock it is not a 400
Same with the flexplate, stock it has a weight.

As Tom said, it sounds like a 3970010 4"bore block.

To the best of my knowledge all 400's end in 817, 509 or 511 but with GM I learned long ago to never say always,,

 

[Wolfplace]

Ill look at the heads tomorrow night,

the last numbers are 000 there is no other numbers it could be,, they are real plain and clear......... 2 freeze plugs on each side.

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400's came with
2 freeze plugs with no center casting for the third
2 freeze plugs with a raised casting for the third that was not machined
3 freeze plugs
I have never seen a 400 with three freeze plugs that was not a 4-bolt.
This does not mean GM never did it,,,, as I said with GM never say never or always,,

But all 400's I have ever seen & this is a lot in the last 30+ years have the cooling bulges that run vertically at each bore.
Very easy to feel with your hand.

 

[Wolfplace]

Mike,
Now you've seen one. :yes:
This is the 400 block that I just had machined to replace the cracked one that was in my jet boat.
Its a 511 block with an H 11 72 date code (Aug 11, 72). Years ago, I pulled it out of a 73 4dr Impala. Obviously, it would have been a very early production 73.

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Hi Tom,
LOL,,, as I said I never say never or always with GM, I figured there were probably 2 bolt ones but can't ever remember doing one.
Now if you can find a 4 bolt with two,,,,,

And the 2 bolt is my block of choice when it comes to a 400, webbing is stronger.

350 is a different deal due to the narrow registers.
Excellent pic of the vertical bulges for Remy too :thumbsup: