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Old 12-14-2006, 10:56 AM   #1
53lowdown
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Engine Suffix code U5?

I've got V0728U5 stamped on the block, in front of the passenger side head. I've searched the links below, and don't see anything like that. What does U5 mean?

http://www.nastyz28.com/gm-chevy-cod...s-suffix-2.php
http://www.nastyz28.com/sbchevy/sblock.html
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Old 12-14-2006, 12:09 PM   #2
396muncie
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Re: Engine Suffix code U5?

It should be all letters for the suffix. They used 2 letters until 69 and in 70, started using 3 letters. Look closely at that second digit. Also, car engines started with a "C" and trucks with a "T" starting with 1970. An exception is "CE". That meant an engine that was bought over the counter from a dealership. I'm sure there are more exceptions as this is GM afterall. Any more info anybody?
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Old 12-14-2006, 12:20 PM   #3
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Re: Engine Suffix code U5?

Could it be US? If so, this is what nasty z-28 shows:

US: 1979 305 LG4 H 160 4 Cutlass
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Old 12-14-2006, 12:28 PM   #4
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Re: Engine Suffix code U5?

http://www.chevymania.com/partsid/main.cfm
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Old 12-14-2006, 01:06 PM   #5
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Re: Engine Suffix code U5?

Quote:
Originally Posted by dave2953 View Post
Could it be US? If so, this is what nasty z-28 shows:

US: 1979 305 LG4 H 160 4 Cutlass
It's definately a five V0728U5
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Old 12-14-2006, 03:23 PM   #6
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Re: Engine Suffix code U5?

Anyway you could take a pic and post. That's a new one to me.
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Old 12-14-2006, 05:51 PM   #7
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Re: Engine Suffix code U5?

Here's the pic - thanks for the help

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Old 12-14-2006, 09:13 PM   #8
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Re: Engine Suffix code U5?

It could be that it was mis stamped. Ever here the old saying mind your ps and qs it was started buy type setters.
Can you get the cast # off the block and heads?
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Old 12-14-2006, 11:32 PM   #9
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Re: Engine Suffix code U5?

Casting number on the back of the block is 8970020. I'll pull one of the valve covers tomorrow and get the head number if this doesn't identify it.

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Old 12-15-2006, 12:05 AM   #10
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Re: Engine Suffix code U5?

8?----3970020='68-'73--307 truck and pass.
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