1967 3892657 Engine Block Peculiarities - Team Camaro Tech
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  #1  
Old Oct 20th, 06, 08:08 PM
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Steve
 
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Default 1967 3892657 Engine Block Peculiarities

I recently purchased a 1967 3892657 block. The stamping is V1210MV which is from an SS350 67 Camaro. I already knew the Camaro SS350 was the only large journal (2.45”) small block with a cannister oil filter and the crankcase ventilation hole in the back by the distributor.
When I inspected it side by side with a small journal 3892657 327 (V0323MB), I discovered some interesting things I have never seen posted here before.

The locating tangs on the main bearings are in a different location depending on if the engine is machined for a LJ or a SJ crank. Both the 327 and 350 “657” blocks I inspected are machined to accept both SJ and LJ bearing tangs. The 657 is the only small block Chevy I have ever seen machined this way.



There are a couple more differences in the LJ 657 block besides the size of the main bore. The rear main bearing area is machined a little larger on the face to accept the larger thrust surface of the LJ rear main bearing. I placed the LJ rear bearing up against the rear cap of the SJ engine and it looks as though it will just barely fit. The only way to tell for sure would be to line bore the SJ block oversize to LJ specs and drop in a LJ rear main bearing. It’s close!



The groove for the oil slinger is also machined larger on the LJ block. I measured the oil slinger on a 350 crank and it will not fit into the groove in the SJ block. The slinger is about .040” to big to fit. It would be easy to machine down the slinger to fit. The rear seal area is identical on both blocks.



I think if you line bored a SJ 657 block you could drop in a 350 or possibly a 383 crank into that old 327. Just the ticket for the wing window crowd!

Here are a few more pictures. Take a look and let me know what you think. 3892657 Pictures
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  #2  
Old Oct 21st, 06, 01:59 PM
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Default Re: 1967 3892657 Engine Block Peculiarities

Great info Steve. Thanks for sharing it.
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  #3  
Old Oct 23rd, 06, 01:43 PM
rd67RSSS rd67RSSS is offline

 
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Default Re: 1967 3892657 Engine Block Peculiarities

Steve,

Great Information!

I think thats the block I was considering from Jay RSSS? It was a few months too early for me though....

I been considering using a 327 block as they appear to be a little easier to find and was then going to have it allign bored to accept a 350 crank.

Now I know the main cap needs to be clearance a little more for the oil slinger too.

I'm still looking for a March - Late May 350 (or 327) block for my 67 RS/SS convertible....

I wonder how hard it will be to find a 67 350 cranks (the forged one)???
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Old Oct 23rd, 06, 07:49 PM
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Default Re: 1967 3892657 Engine Block Peculiarities

Rick,

If you are considering boring a 327 out to accept a 350 crank this picture might help. It is a rear thrust bearing from the 350 engine sitting on top of the 327 rear main cap.



The red arrows show where there might be some interference between the edge of the bearing and the thrust surface machined into both the block and rear cap.

The yellow arrows point to the beveled edges that will be removed when you line bore it out. The bevels are there to remove the sharp edges that will prevent the bearing from seating properly.

This might work:

After the line bore lightly dress the sharp edges on the rear bearing saddle and cap with a rotary file to create new beveled edges. Your machinist may have a more elegant solution to cut the new bevels.

Test fit the rear bearings. Hopefully they will now fit. If not lightly file the edge of the bearing thrust surfaces (red arrows) until they fit. It should not take much filing to get them to fit. It will be much easier to file the bearing than to machine the block and cap.

Chuck the 350 crank into a lathe and turn down the oil slinger to fit the groove in the 327 block. It will be considerably cheaper to turn down the oil slinger instead of milling out the groove in the block to fit the larger slinger.
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Old Oct 24th, 06, 01:36 PM
rd67RSSS rd67RSSS is offline

 
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Default Re: 1967 3892657 Engine Block Peculiarities

Steve,

Great information!

Now all I need is a 67 350 crankshaft....

Do you know the proper crankshft casting number and does anyone have one????
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  #6  
Old Nov 9th, 07, 04:30 AM
rcm000 rcm000 is offline

 
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Default Re: 1967 3892657 Engine Block Peculiarities

Can you help me with the 3892657 block. This casting was used for both the small journal 327 and the large journal 350 I believe. Are they just line bored to different sizes? I was looking for a 350 block. Do I need to pay attention to what the block is currently line bored to? Or can a small journal be line bored to a large journal using the small journal caps? Also do you kow which crank was in the 350/295hp SS 350? Thanks so much. Ron
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  #7  
Old Nov 9th, 07, 10:12 AM
pdq67 pdq67 is offline
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Default Re: 1967 3892657 Engine Block Peculiarities

Never mind...

pdq67
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  #8  
Old Apr 5th, 11, 06:16 PM
gcdc7 gcdc7 is offline

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Default Re: 1967 3892657 Engine Block Peculiarities

I am new here but I have a few questions. I have a block and crank and pistons. I was told that it is a 327. 14 GM 3892657 On the bac is casi in HB 944 657 H22 C On the front is HB 629 657 The stamp is V0113 HP what does the HP stand for? and the stamp for the vin is 7111118 which I have no idea what this means. I do know it was manufactured in Flint on Ja 13 and I think it is a 327 but how do I know for sure?
Thanks Greg
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Old Apr 6th, 11, 06:20 PM
JohnZ JohnZ is offline
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Default Re: 1967 3892657 Engine Block Peculiarities

Quote:
Originally Posted by gcdc7 View Post
I am new here but I have a few questions. I have a block and crank and pistons. I was told that it is a 327. 14 GM 3892657 On the bac is casi in HB 944 657 H22 C On the front is HB 629 657 The stamp is V0113 HP what does the HP stand for? and the stamp for the vin is 7111118 which I have no idea what this means. I do know it was manufactured in Flint on Ja 13 and I think it is a 327 but how do I know for sure?
Thanks Greg
That block was originally an L-79 (327/350hp), installed in '67 Corvette #111118, which was built at St. Louis on February 16, 1967 with A/C, power steering, and a 4-speed.

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  #10  
Old Apr 6th, 11, 08:39 PM
gcdc7 gcdc7 is offline

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Default Re: 1967 3892657 Engine Block Peculiarities

Thanksfor all te info it was better than I could expect. Now to start thebild on it. Hope it all checks out well. Thanks again a ton.
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