L48 or L82?
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
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From: Van Alstyne, TX
L48 or L82?
I just bought an engine block and heads for a 1974 Corvette (350 CI) and was wondering if there is any markings on the block to tell if it is for an L-48 or L82 car. The VIN derivative wont have the letter that the full VIN would have. It is just the engine block and heads.
Thanks!
Thanks!
Pro
Joined: Nov 2013
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From: Catoosa Okla
I just bought an engine block and heads for a 1974 Corvette (350 CI) and was wondering if there is any markings on the block to tell if it is for an L-48 or L82 car. The VIN derivative wont have the letter that the full VIN would have. It is just the engine block and heads.
Thanks!
Thanks!
Race Director
Joined: Jul 2001
Posts: 15,892
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I just bought an engine block and heads for a 1974 Corvette (350 CI) and was wondering if there is any markings on the block to tell if it is for an L-48 or L82 car. The VIN derivative wont have the letter that the full VIN would have. It is just the engine block and heads.
Thanks!
Thanks!
Team Owner
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From: Southbound
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Melting Slicks
Joined: May 2006
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From: Raleigh NC
St. Jude Donor '13-'14
Is engine suffix missing?
If so, check the number of main bolts (L82 has 4-bolt mains) and check the pistons (dished vs. flat tops). Granted, these could have been changed out, but it will give you a better idea.
If so, check the number of main bolts (L82 has 4-bolt mains) and check the pistons (dished vs. flat tops). Granted, these could have been changed out, but it will give you a better idea.
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Instructor
Joined: Sep 2009
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From: Waterbury CT.
The CLA suffix shows that it is a 350ci 195 hp automatic it is not an L82. It's an L48.
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
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From: Van Alstyne, TX
Funny you ask. I recently acquired 74 convertible, and went through just that. I was told the engine wasn't original. A little research proved otherwise. So yes, not only can you tell if it's an L-48 or an L-82 and what year, it can also tell whether the transmission that was mated to that motor was a standard or an automatic. I'll do some digging and try to post the link. Congrats on your 74! The bummer to our year is the dismal HP from either the L-48 or the L-82. On the bright side ours was the last year of true duel exhaust and more importantly I can assure you, is the fact ours was the last year to have a fiberglass floorboard. Thank your lucky stars on that one, I assure you!
If it that easy, then it is an L48 since it had two bolt mains.
Team Owner
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From: Southbound
Cruise-In II Veteran
Check the pad on the block. Pete's pic shows you what to look for and where to find it. If the engine ID suffix is there, you don't have to pull the pan or the valve covers to identify the engine.
Melting Slicks
Joined: May 2006
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From: Raleigh NC
St. Jude Donor '13-'14
Correct. I do not have a '74 L82 (auto or manual shift) engine pad in my library. My purpose was to give the OP a snapshot of what he is looking for. From previous posts, he is very astute corvette enthusiast, so I am sure he knows about the engine pad. But, I don't always like to assume.
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Team Owner
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From: Southbound
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Race Director
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The 4 before the S in the VIN says it's from a '74 model year car. The engine machine code says it was assembled on August 1st at the Flint MI plant and went into a L48 w/Turbo 400 Corvette.
The VIN indicates it was installed in car S/N 131, probably the second day of production.
The VIN indicates it was installed in car S/N 131, probably the second day of production.
Burning Brakes
Joined: Apr 2013
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From: Castle Rock CO
I just bought an engine block and heads for a 1974 Corvette (350 CI) and was wondering if there is any markings on the block to tell if it is for an L-48 or L82 car. The VIN derivative wont have the letter that the full VIN would have. It is just the engine block and heads.
Thanks!
Thanks!
Here is site that gives the casting numbers
http://corvettec3.ca/casting.htm#1974_Options
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