C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Feedback needed on engine block numbers

Thread Tools
 
Search this Thread
 
Old Oct 1, 2025 | 09:32 PM
  #1  
NormB1's Avatar
NormB1
Thread Starter
Racer
25 Year Member
Conversation Starter
All Eyes On Me
Loved
 
Joined: Aug 1999
Posts: 441
Likes: 2
From: SoCal
Default Feedback needed on engine block numbers

Supposed to be an original 454, has a 4 speed manual, and A pilar VIN is matching, but last two digits on engine are not as deep as the rest.
Opinions?



Reply
Old Oct 1, 2025 | 09:56 PM
  #2  
69L88's Avatar
69L88
Melting Slicks
15 Year Member
Veteran: Army
Liked
Community Favorite
 
Joined: Nov 2006
Posts: 3,409
Likes: 1,821
From: Apple Valley, MN
Default

CPH code was used in 1971 and 1972.

Not worried about the stamping. Can you look at the aft shelf of the block and get the casting number and casting date?
Reply
Old Oct 1, 2025 | 10:14 PM
  #3  
NormB1's Avatar
NormB1
Thread Starter
Racer
25 Year Member
Conversation Starter
All Eyes On Me
Loved
 
Joined: Aug 1999
Posts: 441
Likes: 2
From: SoCal
Default

Thanks, and sorry should have said it is a 1971 convertible.
I was not able to look at the rear of the block numbers.
Reply
Old Oct 1, 2025 | 10:29 PM
  #4  
barkingrats's Avatar
barkingrats
1967 Pedal Car Champion
Supporting Gold
 
Joined: Mar 2020
Posts: 9,135
Likes: 4,245
From: US-PNW
Default

I'm far from a stamp expert but will say the VIN looks OK to me. The number shapes all seem to be typical Chevrolet - even the three variations for the 1 - and are all aligned. You can see that the gang holder is struck really heavily on the left and diminishes you read to the right -- it was likely not placed against the pad with equal pressure. You also have character blocks with varying heights, so some numbers leave a lighter impression than others.
Reply
Old Oct 2, 2025 | 01:57 PM
  #5  
Alan 71's Avatar
Alan 71
Team Owner
15 Year Member
Active Streak: 120 Days
Community Influencer
Top Answer: 5
 
Joined: Sep 2006
Posts: 31,270
Likes: 4,362
From: Westminster Maryland
Default

Hello,

The vin derivative was stamped on the transmission case at the same time as the engine pad... what does that stamp look like?
Typically the same person loaded the holder and used it for the engine and transmission.So typically the same idiosyncrasies appear in both places.

Regards....




Last edited by Alan 71; Oct 2, 2025 at 02:42 PM.
Reply
Old Oct 4, 2025 | 06:50 PM
  #6  
NormB1's Avatar
NormB1
Thread Starter
Racer
25 Year Member
Conversation Starter
All Eyes On Me
Loved
 
Joined: Aug 1999
Posts: 441
Likes: 2
From: SoCal
Default

Originally Posted by Alan 71
Hello,

The vin derivative was stamped on the transmission case at the same time as the engine pad... what does that stamp look like?
Typically the same person loaded the holder and used it for the engine and transmission.So typically the same idiosyncrasies appear in both places.

Regards....
Thanks, good to know, but I was not able to look at the transmission stamp when I looked at the car.

Reply

Get notified of new replies

To Feedback needed on engine block numbers





All times are GMT -4. The time now is 03:06 PM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE