Can anyone de-cipher the following numbers....Thanks for any help!

Casting at the rear - drivers side, just ahead of the bell housing 8999289 CONV GM01


Passenger side stamp / front TO803CWR 14S400036


Also the exhaust manifolds are cast:
drivers side GM2T
pass side GM2

 

CWR: 454ci, 270hp (automatic transmission)

3999289: 454ci, 270hp (You read the 3 as an 8 im assuming)

 

I think the T is for the Tonawonda (sp?) engine plant

0803, Is that August 3, 1973?

CWR - have to look it up, but it must be the suffix for the 454 with auto..


Your vin derivative, so that would be the original engine and your very low # vin

 

Do you have access to the car, or just the engine? If you have access to the car, please tell me what the date code, paint code, and trim code are on the trim tag in the driver's door jam. I am doing research on 74 Vette date and paint codes.

 

Correct. All Corvette big blocks where assembled at the Tonawanda, New York facility. All Corvette smallblocks were assembled at Flint, Michigan (V code).

 

Any idea of the significance of the casting CONV at the rear?

Casting at the rear - drivers side, just ahead of the bell housing

8999289 CONV GM01

 

I have a 72 convertible and I just told my wife it meant convertible lol. I dont know anything else it might be. Maybe one of the NCRS guys can answer it. Im curious as well.

 

Courtesy of www.welovecorvettes.com

________________________________________ _


The 1974 Corvette Specifications

The first year Corvette with "rubber" bumpers front and rear, the latter easily distinguishing itself by the vertical split between the two halves of the bumper assembly. The FE7 gymkhana suspension package was offered as a new option. 1974 was the last year that a big block engine was available in a Corvette.

1974 Corvette Options
RPO# DESCRIPTION QUANTITY $ RETAIL
1YZ37 Base Corvette Sport Coupe 32,028 6,001
1YZ67 Base Corvette Convertible 5,474 5,765
A31 Power Windows 23,940 86
n/a Custom Interior Trim 19,959 154
A85 Custom Shoulder Belts (std with Coupe) 618 41
C07 Auxillary Hardtop (convertible only) 2,612 267
C08 Vinyl Covered Auxillary Hardtop (convertible only) 367 329
C50 Rear Window Defroster 9,322 43
C60 Air Conditioning 29,397 467
FE7 Gymkhana Suspension 1,905 7
n/a Optional Rear Axle Ratio 1,219 12
J50 Power Brakes 33,306 49
LS4 454ci, 270hp Engine 3,494 250
L82 350ci, 250hp Engine 6,690 299
M21 4-Speed Manual Transmission, close ratio 3,494 0
M40 Turbo Hydra-Matic Automatic Transmission 25,146 0
N37 Tilt-Telescopic Steering Column 27,700 82
N41 Power Steering 35,944 117
QRM GR70x15 White Stripe Steel Belted Tires 9,140 32
QRZ GR70x15 White Letter Steel Belted Tires 24,102 45
UA1 Heavy Duty Battery (std with LS4 engine) 9,169 15
U05 Dual Horns 5,258 4
U58 AM-FM Stereo Radio 19,581 276
U69 AM-FM Radio 17,374 173
UF1 Map Light 16,101 5
YF5 California Emission Test n/a 20
Z07 Off Road Suspension and Brake Package 47 400


1974 Corvette Exterior Color Choices
CODE EXTERIOR QUANTITY
910 Classic White n/a
914 Silver Mist n/a
917 Corvette Gray n/a
922 Corvette Medium Blue n/a
948 Dark Green n/a
956 Bright Yellow n/a
968 Dark Brown n/a
974 Medium Red n/a
976 Mille Miglia Red n/a
980 Corvette Orange n/a


1974 Corvette Interior Color Choices
CODE COLOR
400V Black Vinyl
404 Black Leather
406 Silver Vinyl
407 Silver Leather
408 Neutral Vinyl
413 Dark Blue Vinyl
415 Saddle Vinyl
416 Saddle Leather
425 Dark Red Vinyl

 

Courtesy of www.idavette.net

________________________________________

1974 Corvette



Wheelbase: 98" Track: 58.7" Front / 59.5" Rear Height: 47.8" Coupe
Length: 185.5" Width: 69" Curb Weight: 3,388 lbs.
Tire Size: GR70x15" Plant: St. Louis

The 1974 Corvette was the last Corvette produced without catalytic converters. Cast aluminum wheels were listed on the options list, but according to records, none were sold. The transition to soft bumpers was completed in 1974 with the new body color rear bumpers. This was the last year for the 454 "Big Block" engines.



1974 Options:

Code
Description
Quantity

1YZ37
Base Corvette Sport Coupe
32,028

1YZ67
Base Corvette Convertible
5,474

Custom Interior Trim
19,959

A31
Power Windows
23,940

A85
Custom Shoulder Belts
618

C07
Auxiliary Hardtop (Convertible)
2,612

C08
Vinyl Covering For Aux. Hardtop
367

C50
Rear Window Defroster
9,322

C60
Air Conditioning
29,397

FE7
Gymkhana Suspension
1,905

Optional Rear Axle Ratio
1,219

J50
Power Brakes
33,306

LS4
454ci 270hp Engine
3,494

L82
350ci 250hp Engine
6,690

M21
4 Speed Manual Close Ratio
3,494

M40
Turbo Hydra-Matic Automatic Transmission
25,146

N37
Tilt-Telescopic Steering Column
27,700

N41
Power Steering
35,944

QRM
White Stripe Steel Belted Tires GR70x15
9,140

QRZ
White Letter Steel Belted Tires GR70x15
24,102

U05
Dual Horns
5,258

U58
AM/FM Radio Stereo
19,581

U69
AM/FM Radio
17,394

UA1
Heavy Duty Battery
9,169

UF1
Map Light On Rear View Mirror
16,101

YF5
California Emissions Test

YJ8
Cast Aluminum Wheels
0

Z07
Off Road Suspension and Brake Package
47


Serial Numbers: 1Z37J4S400001 through 1Z37J4S437502

For Convertibles, the third digit is a "6"

Fifth Digit Code: J=350ci 195hp, T=350ci 250hp, Z=454ci 270hp

Suffix:

CKZ: 350ci, 195hp MT CLR: 350ci, 250hp MT
CLA: 350ci, 195hp AT CLS: 350ci, 250hp MT CE
CLB: 350ci, 195hp MT CE CWM: 454ci, 270hp MT
CLC: 350ci, 195hp AT CE CWR: 454ci, 270hp AT
CLD: 350ci, 250hp AT CWS 454ci, 270hp AT CE
CLH: 350ci, 250hp AT CE CWT: 454ci, 270hp MT CE

CE=California Emissions, MT=Manual Trans, AT=Automatic Trans, AC=Air Conditioning, AH=Aluminum Heads,



Base Engine: 350ci V8 195hp

 

I have never seen CONV included in the casting numbers like this. Surely GM didn't designate this particular block for a convertible ??

 

CONV may mean Conventional, as most BB's say HIPERF, PASS, TRUCK, etc in this area. I can't find any documentation on it in any of Casting Databases.

CWR code was used for the 1973 Corvette 454 275 HP engine

 

I'm sure they didn't either.....I've got CONV T1 on my SB.....it's a '72 4 bolt mains......I was never able to find any info on the CONV casting....

 

Thanks...I've never seen it either.....just as long as it's not the super secret code for a J C Whitney replacement block!

 

Yessss, your engine was cast by a red haired man wearing galoshes and a Jim Beam hat...he had Life cereal for breakfast and two glasses of Oran...no wait...Grapefruit juice. Any other questions?