69 ZL1 engine info....Help! - Team Camaro Tech
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post #1 of 7 (permalink) Old Nov 12th, 18, 07:12 AM Thread Starter
Probationer
 
Join Date: Nov 2018
Posts: 3
69 ZL1 engine info....Help!

Hi everybody. I bought this engine from a friend and I'm looking for info.

Obviously this is a Aluminum Big Block produced by the winters foundry. It has the correct Casting # of 3946052 on the back, but the 2 appears to be a little smaller than the others. Is that correct? I've never been able to find pics of an original casting #.

Also, I can not find a date on the engine anywhere. The only other # is on the drivers side, rear. It is 05317.

The main caps have been changed, so no date there either.

Any help is appreciated.

Thanks in advance
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post #2 of 7 (permalink) Old Nov 12th, 18, 08:13 AM
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Brian
 
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Re: 69 ZL1 engine info....Help!

Can't help you with your questions, but nice purchase!
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Experience...... It's what you get when you didn't get what you wanted.
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post #3 of 7 (permalink) Old Nov 12th, 18, 05:02 PM
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Rufas
 
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Re: 69 ZL1 engine info....Help!

Chevrolet by the Numbers has this, 3946052, 1969 Camaro, Corvette 427/430 4 bolt.

Text is such,

"This special aluminum block was installed in sixty-nine 1969 Camaros, and two Corvettes during the 1969 model year. This was the only factory-installed aluminum block ever installed in a Chevrolet production car. The primary purpose of this engine was to produce an all-out race engine to the general public, with a significant weight reduction as well. This block had steel cylinder wall sleeves and 4-bolt main bearing caps. It was also produced for service applications and was a by-product of Can-Am racing technology. It also featured special provisions for dry-sump oiling. The lifter gallery has specially cast bosses to accept the four extra studs used to anchor the cylinder heads. See Chapter 5 for head details. There are reports that the first ZL-1 blocks had the casting #3946053 but that has yet to be proven".

Take a look at the OP's post, his engine number is 3946052, and, in the text, it mentions a not proven item, another block number 3946053, and, in CbtN, there is NO 3946053 listed. Since CbtN deals with production line numbers only, the second block number may well be a CERV number.

No date code info. However, if I had to speculate on a date code from those 5 numbers, 05317, I'd think the 05 is the month, May, the 31 is the day, 31st, the 7 would be the year, as cast, 1967. I do believe these engines were used in earlier than 1969 Can-Am cars, and other super specialty applications, and it is not beyond thinking they had a few engines that were produced before 1969 for "other stuff", or, in anticipation of producing another vehicle application, or, spare parts production, engines. It is a very remote possibility that this engine wasn't intended for a production Camaro, but was a parts department spare engine that got sold outright. We may never know, but, it may well be a lot more historic than it appears. This might well be the reason for the smaller number 2.

Are there any numbers stamped on a pad at the front of the block on the pass side, just in front of the r/h head????? I can't see clearly if there is a pad at the front of the right hand head deck face or not. CERV block wouldn't have one.
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post #4 of 7 (permalink) Old Nov 13th, 18, 06:53 AM Thread Starter
Probationer
 
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Re: 69 ZL1 engine info....Help!

There are no #'s on the pad or by the oil filter.


I was always lead to believe that the CAN AM blocks were solid blocks ( no water jackets) and no side motor mounts.


The smaller 2 is what confuses me. It's the correct #. I can't imagine they would have a specific mold and a smaller 2 be the only difference.
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post #5 of 7 (permalink) Old Nov 13th, 18, 09:21 AM
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James
 
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Re: 69 ZL1 engine info....Help!

I have seen pictures a few other blocks with that casting number and they are all small 2.

05317 looks like a date code, but another block with same casting number has 060-17 there. Look close, is there a dash?

Screw in plugs are a clue, and so is bore size if you can measure it. May be a Can Am block. Still valuable, but not as much as a 1969 ZL1 block.

A bit of a pig in a poke there, until you find out exactly what it is. Easy to get burned on that high dollar stuff, so I stay away.

Super Car Registry would be your best source for decoding. Owner there has had many real cars including ZL1's.
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post #6 of 7 (permalink) Old Nov 13th, 18, 09:59 AM Thread Starter
Probationer
 
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Re: 69 ZL1 engine info....Help!

Quote:
Originally Posted by 68 Ragtop View Post
I have seen pictures a few other blocks with that casting number and they are all small 2.

05317 looks like a date code, but another block with same casting number has 060-17 there. Look close, is there a dash?

Screw in plugs are a clue, and so is bore size if you can measure it. May be a Can Am block. Still valuable, but not as much as a 1969 ZL1 block.

A bit of a pig in a poke there, until you find out exactly what it is. Easy to get burned on that high dollar stuff, so I stay away.

Super Car Registry would be your best source for decoding. Owner there has had many real cars including ZL1's.
No dash in the # and it has screw in freeze plugs. Bore size doesn't help since it's been changed internally.

I'll try the Super Car Registry.

Thanks
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post #7 of 7 (permalink) Old Nov 13th, 18, 11:53 AM
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James
 
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Re: 69 ZL1 engine info....Help!

Pic of casting number with small 2
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