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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: SuperCab on March 13, 2009, 08:14:57 pm

Title: Block ID Number
Post by: SuperCab 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...

Title: Re: Block ID Number
Post by: VileZambonie on March 13, 2009, 08:16:22 pm

get the number off of the bell housing area of the block.

Title: Re: Block ID Number
Post by: SuperCab on March 13, 2009, 08:47:29 pm

Ahh. Ok.

Title: Re: Block ID Number
Post by: choptop 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.

Title: Re: Block ID Number
Post by: VileZambonie 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 #