1987 V10 Engine Block Question

[eastalan315]

I have 1987 v10 that I’m in process of restoring with my son. Appears that at some point there has been a different engine installed so I’m wondering if anyone can help me identify what it is so can get like new gaskets and belts for it.
Thanks in advance. 
Alan


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[ehjorten]

A search for GM Engine Casting Number 3970010 on the interwebs indicates that is was used from 1969 to 1979 on 327 and 350 SBC with either 2 or 4-bolt mains. Are the stamped letters and numbers still on the front passenger's side pad?

[eastalan315]

Here is some pics of other markers on the block. Although don’t see any on passenger side.  Thanks Alan


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[eastalan315]

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[eastalan315]

Need help with identifying the engine type in this truck. My son and I are in process of doing a restore and obviously someone along the line has dropped a different engine in this truck.  Need help knowing like what belts and gaskets to order for replacement.  Thanks Alan





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[bd]

A search for GM Engine Casting Number 3970010 on the interwebs indicates that is was used from 1969 to 1979 on 327 and 350 SBC with either 2 or 4-bolt mains. Are the stamped letters and numbers still on the front passenger's side pad?

Look on the cylinder deck pad at the right front of the engine (passenger side) above the water pump.

Edit:  the engine code comprises the large alphanumeric digits stamped into the milled pad imaged below.

[ehjorten]

What BD said. Look to the front, passenger's side. These are stamped in, so sometimes they are milled away if the block was surfaced. It is very likely a 350 and either 2 or 4-bolt mains.

[JohnnyPopper]

Man (per bd) that's a lotta orange...

[VileZambonie]

Get the casting numbers off of your heads too. Take pictures of the oil pan. Does it have the dual or single dipstick bump out? Belts depends on what was in the truck for pulleys. Just match up your existing belts.

[whipper.snapper]

Hey everyone, (I am the son of the man who wrote this post) the numbers on the front passenger side of the block have been decked off sometime in its life. I have the block casting number, and the numbers on top of the head under the valve covers. But the numbers I have will not tell me everything about the engine, like whether it’s a 327 or 350. So where else can I identify that?


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[JohnnyPopper]

I think all you have left is the head casting numbers to get you close.

Also, per VZ, the oil bumps may give a clue.

Short of that, You could tear it down and measure the bore and stroke. PIA though.

Did it run with the belts you have on it? They have part numbers.

It may be that you have to do some detective work that the engine bore and stroke will not reveal.

[eastalan315]

Here are few pics of the block and heads. Anyone able to identify engine size. 
Also to answer question did it run before removal. Answer is yes it ran very strong. 
 







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[JohnnyPopper]

Someones been busy...

The main bearing caps may have been used in different size motors, so may not be as helpful.

Look like a clean and well maintained motor.

The head casting numbers will give you an indication of the combustion chamber size, that may lead you to what the size of the motor is.

While the motor ran 'strong' what is your search for the size for?

[Captkaos]

3932442 is the casting number on the crank = 267,305,350..cast...medium journal...3.48" stroke
3970010 is the casting number on the block = ....350...69-80...2 or 4
 
that rules out 327, so based on the block and the crank this would be a 350 produced between 1969-1980 with 2 bolt mains.

[whipper.snapper]

First of all, thank you guys for helping me identify the engine. I very much appreciate it.

Secondly, I am going to attach a picture of the main cap bearing. It has a small groove in it that will just barely catch ur fingernail when ran across it. I was replacing the rear main seal and noticed the wear lines. What is y’all’s opinion on what action should be taken based on this? I am going to remove the other caps and inspect the bearing and see what they look like.

I was just about to slap some paint on this thing and put it back on the frame because everything seemed roadworthy so far.





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