Block casting #
Melting Slicks
Joined: Nov 2005
Posts: 2,736
Likes: 0
From: WAY UPSTATE NY
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
The casting numbers are on the rear of the block near where the bellhousing bolts up. The assembly stamp is on the pad in front of the passenger side cylinder head. IE: many casting number were the same, but the assembly stamp defines application.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 12
2 pce RMS block have the casting # where shown
1 pce RMS blocks have 5.7L ( or 5.0L ) in that location and the casting # on the opposite side
1 pce RMS blocks have 5.7L ( or 5.0L ) in that location and the casting # on the opposite side
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
First, only Corvette's and Camaro's had vin sequence stamped in the block.
That engine assembly breaks down as the following.
T0427HK
T=Tonawanda
04=April
27=Day of month
HK=65/327/MT/AC/Special high performance engine 365 HP
The vin should confirm with car, and as it was produced that year. Blocks casting date is maybe 6 months prior to assembly date.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 12
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
There are a couple different block casting numbers. Those above seem to be the numbers stamped onto a machined pad for ID purposes.
There is another block casting number for the block itself. For a '95 or '96 LT1 or LT4 it is 10125327 and is cast into the block. On the sides of the block they cast the number 327 (last digits for the block casting number) in large lettering near the motor mounts. It may be the same number for other years too, but I am sure of it on the '95 & '96.
Because of the 327 markings I got a better deal on my LT4. The owner's mechanic told him it was the wrong motor. The seller even told me that it wasn't the big motor it was a smaller replacement.
There is another block casting number for the block itself. For a '95 or '96 LT1 or LT4 it is 10125327 and is cast into the block. On the sides of the block they cast the number 327 (last digits for the block casting number) in large lettering near the motor mounts. It may be the same number for other years too, but I am sure of it on the '95 & '96.
Because of the 327 markings I got a better deal on my LT4. The owner's mechanic told him it was the wrong motor. The seller even told me that it wasn't the big motor it was a smaller replacement.
Last edited by QCVette; Jun 23, 2016 at 04:23 PM.