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Old Jan 3, 2013 | 10:48 AM
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Default #s matching motor question
I am having my sbc rebuilt and upgraded in my 76, car has 90k miles on it. Just heard from the motor guy, he claims it is a new motor due to the fact that it is so clean, no ridge what ever on the cylanders and the cylanders are round and true, stock bore. said it might be an old GM target motor. the big question is how do I tell if it is a re stamp because the number does match??? Stamp pad does look like others I have seen on the forum.
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Old Jan 3, 2013 | 11:01 AM
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Your 'motor' guy doesn't know how to read a pad? Post a pic.
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Old Jan 3, 2013 | 11:03 AM
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There should be a cast date code on the side of the block.
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Old Jan 3, 2013 | 11:09 AM
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Originally Posted by Mike Ward
Your 'motor' guy doesn't know how to read a pad? Post a pic.
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Old Jan 3, 2013 | 11:22 AM
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Mike you may have misunderstood my question. The pad is not in question, it matches my car. According to him the condition of the motor is too new to have the 90k that is on my odometer.
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Old Jan 3, 2013 | 11:35 AM
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Originally Posted by VetteNURSE
...The pad is not in question, it matches my car...
The pad can be in question if your mechanic is correct. You are going to need the casting date and casting number from he block to get to the bottom of it. You could also get the casting number and dates from the heads and intake manifold while you're there.

Any reason to believe the engine is not original?

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Old Jan 3, 2013 | 12:18 PM
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Thanks easy mike, No reason to think not original...untill now!
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Old Jan 3, 2013 | 12:45 PM
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OK just got another update from the hot rod shop. The date code does match the car! yay! So evidently the block has been bored .020 so that explains the way it looks, so it is matching numbers. Its about all a 76 L48 can have going for it.

Thanks for the info,

Mike
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Old Jan 3, 2013 | 02:31 PM
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Thank your mechanic for shooting your blood pressure through the roof over the possibility of a restamp.

Was he playing Gotcha?

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Old Jan 3, 2013 | 03:38 PM
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Originally Posted by VetteNURSE
stock bore.
Originally Posted by VetteNURSE
So evidently the block has been bored .020

Originally Posted by Mike Ward
Your 'motor' guy doesn't know how to read a pad? Post a pic.
Not only can he not read a pad, he apparently can't measure very well either.
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Old Jan 3, 2013 | 04:18 PM
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Thanks Ward for making me feel even better!!!
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Old Jan 3, 2013 | 08:51 PM
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I'd find a new engine guy.


Scott
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Old Jan 3, 2013 | 09:41 PM
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Lol....but Mike is a smart guy .....I'd listen....
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Old Jan 3, 2013 | 09:58 PM
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Sounds like it was recently bored .020 over and rebuilt. If there is no ridge, bore dimensions are good and cylinders are round why are you rebuilding it?
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