Picking up a 400 SBC - Page 5 - Chevelle Tech
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post #61 of 89 (permalink) Old Dec 2nd, 19, 9:50 PM Thread Starter
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Re: Picking up a 400 SBC

Quote:
Originally Posted by 71350SS View Post
I don't think so.Here's the only listing I could find for 462's
3767462------327-----62-67----1.72/1.50
and
3782462----327--67---1.94/1.50--Corvette 2.02/1.60
and
3814462---350---67---1.94/1.50-
and this one
3890462---302/327/350---62-68---1.94/1.50 2.02/1.60--64cc Doubble humps

I found these listings here :
Chevy Casting Number identification - Block casting numbers
I will go and get the numbers off the heads tomorrow and post them.

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #62 of 89 (permalink) Old Dec 2nd, 19, 10:56 PM
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Re: Picking up a 400 SBC

Quote:
Originally Posted by Aaron View Post
Tom...great post as always.

I think I have a 76 and up block.

Im having a local shop that does all the local drag racers machine work check it out. He has a complete machine shop at his home.

I may use studs versus bolts for my build...I like insurance.

Sounds like the 5.7 rod is the way to go....I will not be reusing the iron heads...will be using something like a 200 to 210 Brodix, AFR. or Profiler head...aluminum of course.

You probably know to do this, BUUUUUUUUT, just in case you don't know, when using stock type 5.7 (350) rods in a SB400, the bolt head that FACES THE CAM has to be slightly clearanced to clear the cam lobes. TOOOOOOOOOOO EASY to do at home on the work bench. I use a die grinder and a fine sanding disc to do this. If aftermarket rods with cap screws are used, then this is not necessary because they already have the needed clearance.

I also chamfer the oil holes on the crankshaft BEFORE sending it to the machine shop.

Another thing I do is remove the rod caps and bolts. Then I use a die grinder with a small sanding drum to smooth out the rough casting surface of the rod beams, then put them in the blast cabinet and blast the beams where I sanded them. I DO NOT sand the beams all the way down, I just smooth out the roughness. All the experts recommend to have parts such as rods shot peened. But I don't have shot for peening, so I just use the media in my blast cabinet. SUPPOSEDLY, this process helps to relieve stress risers in the rods. Again, these are things you can pay your machinist to do, but since I am a cheapskate, plus, I just like to do my own work as much as possible, I do it myself before taking everything to the machine shop-----------------AND, AND, AND, I know it was done if I do it!
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post #63 of 89 (permalink) Old Dec 2nd, 19, 11:01 PM
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Re: Picking up a 400 SBC

Quote:
Originally Posted by Tommy the Cat View Post
I looked all over and couldn't find a 4.125" steel shim gasket. Do the ones on your engine clear the bore?

I'm really intrigued by this. I looked everywhere for a set.

I have NEVER KNOWN of a steel shim head gasket for a SB400. All I've ever known about is the composition gaskets.
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post #64 of 89 (permalink) Old Dec 2nd, 19, 11:19 PM Thread Starter
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Re: Picking up a 400 SBC

Quote:
Originally Posted by DZAUTO View Post
You probably know to do this, BUUUUUUUUT, just in case you don't know, when using stock type 5.7 (350) rods in a SB400, the bolt head that FACES THE CAM has to be slightly clearanced to clear the cam lobes. TOOOOOOOOOOO EASY to do at home on the work bench. I use a die grinder and a fine sanding disc to do this. If aftermarket rods with cap screws are used, then this is not necessary because they already have the needed clearance.

I also chamfer the oil holes on the crankshaft BEFORE sending it to the machine shop.

Another thing I do is remove the rod caps and bolts. Then I use a die grinder with a small sanding drum to smooth out the rough casting surface of the rod beams, then put them in the blast cabinet and blast the beams where I sanded them. I DO NOT sand the beams all the way down, I just smooth out the roughness. All the experts recommend to have parts such as rods shot peened. But I don't have shot for peening, so I just use the media in my blast cabinet. SUPPOSEDLY, this process helps to relieve stress risers in the rods. Again, these are things you can pay your machinist to do, but since I am a cheapskate, plus, I just like to do my own work as much as possible, I do it myself before taking everything to the machine shop-----------------AND, AND, AND, I know it was done if I do it!
Thanks Tom for the tips....I may send you a PM to get more advice as time comes closer for me to do a build!

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #65 of 89 (permalink) Old Dec 2nd, 19, 11:20 PM Thread Starter
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Re: Picking up a 400 SBC

Quote:
Originally Posted by DZAUTO View Post
I have NEVER KNOWN of a steel shim head gasket for a SB400. All I've ever known about is the composition gaskets.
Tom, the gasket maybe is a comp. gasket. It just felt really thin and hard when I torn it down.

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #66 of 89 (permalink) Old Dec 2nd, 19, 11:44 PM
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Re: Picking up a 400 SBC

Quote:
Originally Posted by Aaron View Post
Thanks Tom for the tips....I may send you a PM to get more advice as time comes closer for me to do a build!

Any time, or feel free to call me 405-745-8383 .

Tom Parsons
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post #67 of 89 (permalink) Old Dec 3rd, 19, 10:53 AM
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Re: Picking up a 400 SBC

Didn't GM use shim gaskets when they assembled the 400s?
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post #68 of 89 (permalink) Old Dec 3rd, 19, 12:11 PM
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Re: Picking up a 400 SBC

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Originally Posted by nitrofox View Post
Didn't GM use shim gaskets when they assembled the 400s?

Last year we pulled a virgin 1973 400 apart (paid $250 for it, carb to pan and AC compressor and PS pump attached) to rebuild for my son's 73 Corvette. It had composition head gaskets.

One of the best 400s I've built. It was std bore, the heads were good and the crank COULD HAVE just been polished, but we had it turned 10-10 anyway. Built it with flat top pistons, 350 rods, a Comp Cams roller cam, opened up the heads and went with beehive springs (first time I've ever had them installed), early Z28 intake and Holley and 2 1/2in exhaust manifolds. My son says his 73 Vette is a new car now!
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Tom Parsons
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post #69 of 89 (permalink) Old Dec 3rd, 19, 12:17 PM
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Re: Picking up a 400 SBC

Nice Tom, would love to build a 400 small block for my 76 Corvette and dress it up as the stock L82
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post #70 of 89 (permalink) Old Dec 3rd, 19, 6:41 PM Thread Starter
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Re: Picking up a 400 SBC

The casting numbers on the heads I took off are 462624.

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #71 of 89 (permalink) Old Dec 3rd, 19, 7:02 PM
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Re: Picking up a 400 SBC

Door stops. Most likely original, though. So your theory that this engine has never been apart is likely true.

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #72 of 89 (permalink) Old Dec 4th, 19, 1:35 AM
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Re: Picking up a 400 SBC

I have about $300 into this short block. Putting Vortec's on it and let'er rip this spring. Not sure why the picture is upside down but you get the idea.
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post #73 of 89 (permalink) Old Dec 4th, 19, 11:26 AM
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Re: Picking up a 400 SBC

Does anyone besides me paint inside their engine and heads (see my pictures above)?
I Picked this up from HOTROD magazine 40-45yrs ago (back in the good ole days when HOTROD published useful stories). Their theory seemed reasonable and I did it on my next engine build. Since then, NEVER any issues, NEVER any paint flaking off. I've had some apart that I've painted inside and the paint is still fine.
Just curious.


Oh ya, and by the way, HOTROD is where I learned how to build a 420 with a stock GM block and cast 400 crank. Only one I have is in the jet boat (EXCELLENT test vehicle) and it still runs hard!
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post #74 of 89 (permalink) Old Dec 4th, 19, 12:02 PM
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Re: Picking up a 400 SBC

Tom, Glyptol or some other paint?

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post #75 of 89 (permalink) Old Dec 4th, 19, 12:51 PM
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Re: Picking up a 400 SBC

You can get Glyptol paint from Eastwood now.
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