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Author Topic: Block ID Number  (Read 2834 times)

Offline SuperCab

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Block ID Number
« on: March 13, 2009, 08:14:57 pm »
I'm still looking at buying the Suburban I talked about in my last post. The owner swears it has a 400sbc in it, not the stock 350.

It's a 1987 GMC Suburban 2500 Sierra Classic

I took a stamped number off the front right top of the engine, which I believe is the ID number, but it doesn't seem to fit with the online decoders...

The # is VF145268

Any ideas?

Thanks guys...
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-Matt

Offline VileZambonie

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Re: Block ID Number
« Reply #1 on: March 13, 2009, 08:16:22 pm »
get the number off of the bell housing area of the block.
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Offline SuperCab

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Re: Block ID Number
« Reply #2 on: March 13, 2009, 08:47:29 pm »
Ahh. Ok.
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Offline choptop

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Re: Block ID Number
« Reply #3 on: March 13, 2009, 08:52:13 pm »
If its a 400, the harmonic balancer will have a notch taken out of it on the perimeter on one side. If its a complete, smooth ring front to back, all the way around, then I doubt its a 400. If it is, with a 350 harmonic balancer it will have a bad vibration. Does someone here have a 400 balancer pic to show him what it looks like. Im not sure how to describe it.
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Offline VileZambonie

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Re: Block ID Number
« Reply #4 on: March 13, 2009, 09:06:56 pm »
You can't definitively go by that as there are so many different balancers. Best bet is id the block by it's casting #
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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