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Old 06-22-2011, 07:41 PM   #1
JQ-72
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Big Block on VIN plate - can you tell?

Do the GVW numbers decipher whether a SWB truck had a big block or not?

JQ
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Old 06-22-2011, 08:20 PM   #2
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Re: Big Block on VIN plate - can you tell?

In 1972, All domestic 1/2 ton Big Block trucks were required to have both heavy front and rear springs. This requirement enables us to determine if the truck was originally equipped with heavy front and rear springs by viewing the weights on the Gross Weight/VIN plate. If the truck was originally equipped with heavy front and rear springs, The "As-Manufactured" (left-hand figures) Gross Weight for this Vehicle Must be 5400 pounds, the Maximum Front End Ground Weight must be 3100 and The Maximum Rear End Weight at Ground must be either 3220 or 3500. Remember, not all trucks with these Gross Vehicle Weights were Big-Blocks, but all Big-Blocks have these Gross Weights. AGAIN, THIS IS ONLY FOR 1972 1/2 Ton Trucks!!! See examples.

I also look for original rivets on the VIN plate, frame # matching, exhaust brackets, etc.
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Last edited by DANTIP; 06-22-2011 at 08:30 PM.
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Old 06-22-2011, 10:22 PM   #3
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Re: Big Block on VIN plate - can you tell?

Nice Tip Dan. Trevor
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Old 06-22-2011, 10:43 PM   #4
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Re: Big Block on VIN plate - can you tell?

So in 1972 at least, the vin will tell you if was a BB, but the vin will not tell you if it was a SWB?+

I SEE IT WONT TELL YOU IF IT WAS A BB, RATHER IF IT DOES NOT HAVE THOSE WEIGHTS IT WAS NOT A BB.
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Last edited by sameyrasmea72; 06-22-2011 at 10:47 PM.
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Old 06-22-2011, 10:50 PM   #5
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Re: Big Block on VIN plate - can you tell?

Some good info here!
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Old 06-23-2011, 01:16 AM   #6
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Re: Big Block on VIN plate - can you tell?

The SPID will have the VIN #, wheel base and the model # info. As mentioned previously by Dan, you look at all these areas to authenticate the truck.
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