C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

76 Corvette Engine Code has me Stumped

Thread Tools
 
Search this Thread
 
Old Mar 21, 2022 | 10:16 AM
  #1  
Andred1971's Avatar
Andred1971
Thread Starter
5th Gear
 
Joined: Mar 2022
Posts: 5
Likes: 0
Default 76 Corvette Engine Code has me Stumped

I just purchased my very first Corvette, 1976. Was 'told' it was all original, but its obviously not, but no biggie. I have researched the Engine Code and Engine ID and I am trying to figure out if its a 327 or 350 and if its a 1698 or 1969, (I'm told its a 350) Here are my numbers:CASTING NUMBER: 3956618
ENGINE id AND CODE : 791159179 T0616HM
Vin:
1Z37X6S417382

The HM tells me its a 65, 68 or 69
But the Casting number says is a 1968 or 1969, so that eliminated the 1965.

So now is it a 1968/69 327 2 bolt
or a 1969 350 4 bolt?

I'm more inclined its a 1969 4 bolt.

Thanks in advance from the Newbie
Andre
Reply
Old Mar 21, 2022 | 10:50 AM
  #2  
rmm82's Avatar
rmm82
Instructor
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2009
Posts: 199
Likes: 35
From: USA
Default

According to the 'Corvette Restoration Guide' by Richard Prince, the casting number 3956618 is a 1969 mid-year 350.
Reply
Old Mar 21, 2022 | 11:10 AM
  #3  
Andred1971's Avatar
Andred1971
Thread Starter
5th Gear
 
Joined: Mar 2022
Posts: 5
Likes: 0
Default

Thanks! I'll go with that! Until told otherwise :-)
Reply
Old Mar 21, 2022 | 11:20 AM
  #4  
SEVNT6's Avatar
SEVNT6
Le Mans Master
15 Year Member
Active Streak: 120 Days
Liked
Top Answer: 5
 
Joined: Jan 2007
Posts: 8,039
Likes: 3,344
From: Omaha NE
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2022 C3 of the Year Finalist - Unmodified
2020 C3 of the Year Finalist - Unmodified
Default

Are you sure the suffix is HM?
If it's HW that would make it a '69 350.
Also your VIN shows it was a L82 originally...
Reply
Old Mar 21, 2022 | 01:32 PM
  #5  
Andred1971's Avatar
Andred1971
Thread Starter
5th Gear
 
Joined: Mar 2022
Posts: 5
Likes: 0
Default

I

ts definitely HM
and yes. Still has L-82 on hood
Reply
Old Mar 21, 2022 | 03:15 PM
  #6  
PJO's Avatar
PJO
Melting Slicks
20 Year Member
Veteran: Marine Corps
Liked
Community Favorite
 
Joined: May 2002
Posts: 2,476
Likes: 756
From: Laporte, IN
Default

T= Tonowanda 06= June 16= 16th day HM= HM 69 350 250 2B,TH350 PA is a 350ci 250hp 2 barrel carb turbo hydromatic trans passenger vehicle.
791159179 Partial VIN but was in 159,179 vehicle built of that type.

Last edited by PJO; Mar 21, 2022 at 03:29 PM.
Reply
Old Mar 21, 2022 | 03:56 PM
  #7  
derekderek's Avatar
derekderek
Race Director
 
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Default

doesn't mean it IS a 250 hp 350. but it WAS. i assume the 2 barrel carb and intake are not there? that is the biggest diff between a 250 and 300 hp 350. but it could have been rebuilt and be somewhat special. higher compression. more cam. better internals... there is no knowing what has been done to that engine. buying a cheap ebay or amazon borescope and getting a look at pistons and crankshaft may be worth doing. then you can also do pelvic exams for all your wife's girlfriends...
Reply

Get notified of new replies

To 76 Corvette Engine Code has me Stumped





All times are GMT -4. The time now is 10:58 PM.

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-4
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-5
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-6
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-7
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-8
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-9
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE