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Discussion Starter · #1 ·
Hello to everyone out there in Corvette-land.

I'm Scott. Have a 76 Corvette I recently purchased. Super excited to get back to some (old-) car work after a 20 year hiatus. Starting with electrical gremlins. Ultimate goal is to drive it as much as possible, I never baby 'em.

Already feeling welcome due to member assistance with a wiring diagram.

Lastly, I still own my first car, a 79 Malibu. Not is driving condition, but someday...
 

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DC PIT CREW BOSS
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Hi Scott. Welcome top DC . make sure you post some pics and keep us informed with the progress
 
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1966 Coupe 454/538hp 4spd of course; 1984 Z51, built 11/83, Blue w/Black Leather factory override..
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As they say, PEDAL to the Met... er.. Fiberglass.
Welcome aboard Mate.

C'ya here,
D
 

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Welcome to the forum
 
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1966 Coupe 454/538hp 4spd of course; 1984 Z51, built 11/83, Blue w/Black Leather factory override..
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11,718 Posts
... I know missing the 1976 but a 75 is the same....
HAHAHA.. well OK... BUT.. For those whom want to become the experts on '75 vs. '76, look no further:

VIN
6th. position, 75-5: 76-6

Engines:
‘75 VIN 5th. position engine code J, L45, 165hp; T L82, 205.
‘76 L, L48, 180hp; X, L82, 210hp.

Side Mouldings: No changes
Front Mouldings: No changes
Rear Mouldings: Letter Kit
‘75 6260519
‘76 374699
Trim Tag: No Change 3/8th. Font size (change in early ‘73 from 1/4")

‘75 vs. ‘76 Options
Last Year for Astro Ventillation
Last C3 Convertible
A85 Custom Shoulder Belts (standard with Coupe)
CO7 Aux. Hard Top, CO8 Vinyl (Vert)
C50 Rear Window Defrost
U95 Dual Horns
Z07 Off Road Suspension/Brakes (required L82, M21, FE7)

‘76
YJ8 Aluminum Wheels
Air induction moved from rear of hood forward over radiator
Hood unique to the ‘76
Vega/other Chevy Sport Steering Wheel
New Sealed Delco Freedom Battery
Late production use of ‘77 components (esp. interior)
Rear Moulding, some with larger Corvette Letters, not recessed, used
Last Delco Radio due to console change/depth
C49 glass heating elements vs. forced air (name change Defroster to Defogger)
Partial steel forward underbelly for rigidity, weight reduction, cockpit heat insulation (from cats to raise engine temp for efficiency and offset emission related power loss).

Colors
‘75 Deleted in ‘76
22 Bright Blue
27 Steel Blue
42 Bright Green
67 Medium Saddle
74 Dark Red
76 Mille Miglia Red

‘76 Added
33 Dark Green
37 Mahogany
39 One Dark Green Metallic was built
64 Buckskin
69 Dark Brown
72 Red
39 One Dark Green Metallic was built)

Engine Code (Block Stamp)
‘75
165hp. (The ‘53 was 150hp.)
CHA 4spd. Federal
CHB A/T Fed.
CHZ Turbohydramatic CA
205hp.
CHC 4spd. Fed.
CHR Turbohydramatic CA

‘76
180hp.
CKW 4spd. Federal
CKX Turbohydramatic
CLS Turbohydramatic CA
210hp.
CHC 4spd. Fed.
CKC Turbohydramatic

1975 the ZQ3 engine was redesigned for a compression reduction of half a point and was simultaneously outfitted with catalytic conversion. Header pipes were combined, 2 to 1, into cat, then exiting cat 1-2 to rear exhaust.

Engine Block #3970010
‘55-‘82 had 30 different blocks with only 7 basic displacements (check block stamp/casting numbers). SB had both 2 & 4 bolt mains.

Crank
SB: 310514, 205hp. 330550 (forged steel)

Heads
Check head casting number
SB: 333882

Rods
5th Design (forged steel, 3/8" bolt, large rod journal, pressed pin). LT-1 6th. Design (forged steel, heat treated, shot peened, magnafluxed, large rod journal, pressed pin, high rpm 302 rod bolts (PSI rating increase)

Carbs
Holley Date Codes through ‘75, 4 digits, Month/Day (3-001-365), Year (0-5)
Rochester
‘75 7045210, 11, 205hp, (non-CA) ‘76 17056206, 07, 180hp.
7045222, 23, 165hp. 17056210, 11, 210hp.
17056226, 210hp, A/T, A/C
Intake Manifold #346249
Check casting # top of runners, EGR fitting, oil splash shield.

Exhaust Manifold #3989036
Check casting #, 210hp without A.I.R.

Water Pump #330813

Distributor H.E.I., Delco Remy

‘75: 1112880, 165hp, CA
1112883, 205hp., 1st. Design
1112888, 165hp, exc. CA
1112979, 205hp./L82, 2nd. Design
‘76: 1103200, 210hp.
112888, 180hp, exc. CA
1112905n 180hp, A/T CA

Camshaft
‘75-’76: Lift .390/310 Intake/Duration, .410/.420 Exhaust/Duraton, rocker 1.50
165hp, Casting No. 3896930, Part No. 3896929, Horizontal Diamond
205/210hp, Casting No. 3896964, Part No. 3896962, Vertical Diamond

Alternator Delcotron
‘75: 1100950 (early, very rare), 110284 (2nd. Production), 42 amp.,
1100544 A/C, 1102474, (2nd. Production), 61 amp.
‘76: 1102474 A/C, 1102484, Non A/C, 42 amp.

Transmissions
4spd. Warner, wide/close ratios, portion of VIN # stamped left side, main case,; A/T on ID plate Rt. Side or bellhousing, 2 digit code apinted on maincase, below sidecover, ratio ID (HS=2.64:1, 1.75:1, 1.33:1, 1:1, Reverse 2.55:1; HW=CR, 2.43:1, 1.61, 1,23, 1, 2.35; Maincase # 1304 065 903; Extension #13.04.066.901, Sidecover #13-04-097-901.

3Spd. Turbohydramatic 400, Drive 2:48, 1.48. 1, Low 1-2 2.48, Rev. 2.08, ‘76 400 has model & production # stamped below the build date code (76CA6997=Chevy-Engine-4 digit sequence #)

Rear Axle
Alpha Numeric Production Code (Example AA= 3.55:1, posi, C= Buffalo Assy Plant, 218= Day of Yr, 8/6/75, 1= 1st. Shift.

‘75: AB=3.70, AW=3.08, AX= 3.36, AY 2.73, LR= 3.36
‘76: OA 3.08, LR 3.36, OB 3.55, OC 3.70

Wheels
‘75: 15x8, code AZ, offset -.50, construction S/TC (standard construction), manufacturer Kelsey-Hayes
‘76: AZ, XN (YJ8) offset -.50, construction CA (cast aluminum), manufacturer Kelsey-Hayes (Mexico)

Delco Starter
‘75-‘76: M/T 2nd Design, 1108775, A/T 1108776

Clutch (Bell) Housing #3899621
Date codes as on engine block, some w/o yr.
11" clutch, 168 tooth flywheel

Harmonic Balancer #3860010
5th. Design, 8" non-fin

Delco Radio
‘69-‘84, 2 numbers= Model Yr-Car Division (Corvette”V”), with Alpha and Alpha Numeric Unit Code to ID the type of radio (Am/FM/ Tape player, etc.)
‘75, ‘76: 51YFP1, Push button, REAR ANTENNA, AM/FM, 51YFM1 Stereo

Hoses:
Mfg. ID; Colored Yarn
‘75: Yel Blu Brn/Yel Blu Violet/Yel Blu Orange/Yel Brn Violet/Yel Brn/Orange/Yel Violet/Orange (Shibani, Japan)
‘76: Yel, Blk, Blu (Manifattura, Italy); Yel, Blk, Brn/Yel, Blk, Orange (Getofla, Brazil)

LOF Glass
Tinted, windshields SHADED (above SOFT-RAY etching), LOF logo between Safety & Flo-Lite, Soft Ray above the LOF logo, Below logo is AS1 followed by date code, below AS1 is “LAMINATED”, Below laminated is “M” followed by DOT 15 certification #, production code (glass specifics).

Side glass. Tinted, solid temper, LOF logo as above. ‘75-6, Astro Ventilation white script is gone.

‘75 Only, Rear Glass and Aux. Hard Top glass, same as above. Vert is vinyl plastic, “VINYLITE” trademark, AS6 rating, mfg, date code, windo wash instructions hot stamped lower left outside corner. Date Code is Month/YR.

‘75 to ‘76 Other Changes:
Fake vents on rear deck eliminated
One piece Corvette rear name plate
Coupe only production

C'ya do that 10yr.+ resto... Every part number and date code matching... Good Luck!!! HAHAHA!!
 

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Discussion Starter · #13 ·
HAHAHA.. well OK... BUT.. For those whom want to become the experts on '75 vs. '76, look no further:

VIN
6th. position, 75-5: 76-6

Engines:
‘75 VIN 5th. position engine code J, L45, 165hp; T L82, 205.
‘76 L, L48, 180hp; X, L82, 210hp.

Side Mouldings: No changes
Front Mouldings: No changes
Rear Mouldings: Letter Kit
‘75 6260519
‘76 374699
Trim Tag: No Change 3/8th. Font size (change in early ‘73 from 1/4")

‘75 vs. ‘76 Options
Last Year for Astro Ventillation
Last C3 Convertible
A85 Custom Shoulder Belts (standard with Coupe)
CO7 Aux. Hard Top, CO8 Vinyl (Vert)
C50 Rear Window Defrost
U95 Dual Horns
Z07 Off Road Suspension/Brakes (required L82, M21, FE7)

‘76
YJ8 Aluminum Wheels
Air induction moved from rear of hood forward over radiator
Hood unique to the ‘76
Vega/other Chevy Sport Steering Wheel
New Sealed Delco Freedom Battery
Late production use of ‘77 components (esp. interior)
Rear Moulding, some with larger Corvette Letters, not recessed, used
Last Delco Radio due to console change/depth
C49 glass heating elements vs. forced air (name change Defroster to Defogger)
Partial steel forward underbelly for rigidity, weight reduction, cockpit heat insulation (from cats to raise engine temp for efficiency and offset emission related power loss).

Colors
‘75 Deleted in ‘76
22 Bright Blue
27 Steel Blue
42 Bright Green
67 Medium Saddle
74 Dark Red
76 Mille Miglia Red

‘76 Added
33 Dark Green
37 Mahogany
39 One Dark Green Metallic was built
64 Buckskin
69 Dark Brown
72 Red
39 One Dark Green Metallic was built)

Engine Code (Block Stamp)
‘75
165hp. (The ‘53 was 150hp.)
CHA 4spd. Federal
CHB A/T Fed.
CHZ Turbohydramatic CA
205hp.
CHC 4spd. Fed.
CHR Turbohydramatic CA

‘76
180hp.
CKW 4spd. Federal
CKX Turbohydramatic
CLS Turbohydramatic CA
210hp.
CHC 4spd. Fed.
CKC Turbohydramatic

1975 the ZQ3 engine was redesigned for a compression reduction of half a point and was simultaneously outfitted with catalytic conversion. Header pipes were combined, 2 to 1, into cat, then exiting cat 1-2 to rear exhaust.

Engine Block #3970010
‘55-‘82 had 30 different blocks with only 7 basic displacements (check block stamp/casting numbers). SB had both 2 & 4 bolt mains.

Crank
SB: 310514, 205hp. 330550 (forged steel)

Heads
Check head casting number
SB: 333882

Rods
5th Design (forged steel, 3/8" bolt, large rod journal, pressed pin). LT-1 6th. Design (forged steel, heat treated, shot peened, magnafluxed, large rod journal, pressed pin, high rpm 302 rod bolts (PSI rating increase)

Carbs
Holley Date Codes through ‘75, 4 digits, Month/Day (3-001-365), Year (0-5)
Rochester
‘75 7045210, 11, 205hp, (non-CA) ‘76 17056206, 07, 180hp.
7045222, 23, 165hp. 17056210, 11, 210hp.
17056226, 210hp, A/T, A/C
Intake Manifold #346249
Check casting # top of runners, EGR fitting, oil splash shield.

Exhaust Manifold #3989036
Check casting #, 210hp without A.I.R.

Water Pump #330813

Distributor H.E.I., Delco Remy

‘75: 1112880, 165hp, CA
1112883, 205hp., 1st. Design
1112888, 165hp, exc. CA
1112979, 205hp./L82, 2nd. Design
‘76: 1103200, 210hp.
112888, 180hp, exc. CA
1112905n 180hp, A/T CA

Camshaft
‘75-’76: Lift .390/310 Intake/Duration, .410/.420 Exhaust/Duraton, rocker 1.50
165hp, Casting No. 3896930, Part No. 3896929, Horizontal Diamond
205/210hp, Casting No. 3896964, Part No. 3896962, Vertical Diamond

Alternator Delcotron
‘75: 1100950 (early, very rare), 110284 (2nd. Production), 42 amp.,
1100544 A/C, 1102474, (2nd. Production), 61 amp.
‘76: 1102474 A/C, 1102484, Non A/C, 42 amp.

Transmissions
4spd. Warner, wide/close ratios, portion of VIN # stamped left side, main case,; A/T on ID plate Rt. Side or bellhousing, 2 digit code apinted on maincase, below sidecover, ratio ID (HS=2.64:1, 1.75:1, 1.33:1, 1:1, Reverse 2.55:1; HW=CR, 2.43:1, 1.61, 1,23, 1, 2.35; Maincase # 1304 065 903; Extension #13.04.066.901, Sidecover #13-04-097-901.

3Spd. Turbohydramatic 400, Drive 2:48, 1.48. 1, Low 1-2 2.48, Rev. 2.08, ‘76 400 has model & production # stamped below the build date code (76CA6997=Chevy-Engine-4 digit sequence #)

Rear Axle
Alpha Numeric Production Code (Example AA= 3.55:1, posi, C= Buffalo Assy Plant, 218= Day of Yr, 8/6/75, 1= 1st. Shift.

‘75: AB=3.70, AW=3.08, AX= 3.36, AY 2.73, LR= 3.36
‘76: OA 3.08, LR 3.36, OB 3.55, OC 3.70

Wheels
‘75: 15x8, code AZ, offset -.50, construction S/TC (standard construction), manufacturer Kelsey-Hayes
‘76: AZ, XN (YJ8) offset -.50, construction CA (cast aluminum), manufacturer Kelsey-Hayes (Mexico)

Delco Starter
‘75-‘76: M/T 2nd Design, 1108775, A/T 1108776

Clutch (Bell) Housing #3899621
Date codes as on engine block, some w/o yr.
11" clutch, 168 tooth flywheel

Harmonic Balancer #3860010
5th. Design, 8" non-fin

Delco Radio
‘69-‘84, 2 numbers= Model Yr-Car Division (Corvette”V”), with Alpha and Alpha Numeric Unit Code to ID the type of radio (Am/FM/ Tape player, etc.)
‘75, ‘76: 51YFP1, Push button, REAR ANTENNA, AM/FM, 51YFM1 Stereo

Hoses:
Mfg. ID; Colored Yarn
‘75: Yel Blu Brn/Yel Blu Violet/Yel Blu Orange/Yel Brn Violet/Yel Brn/Orange/Yel Violet/Orange (Shibani, Japan)
‘76: Yel, Blk, Blu (Manifattura, Italy); Yel, Blk, Brn/Yel, Blk, Orange (Getofla, Brazil)

LOF Glass
Tinted, windshields SHADED (above SOFT-RAY etching), LOF logo between Safety & Flo-Lite, Soft Ray above the LOF logo, Below logo is AS1 followed by date code, below AS1 is “LAMINATED”, Below laminated is “M” followed by DOT 15 certification #, production code (glass specifics).

Side glass. Tinted, solid temper, LOF logo as above. ‘75-6, Astro Ventilation white script is gone.

‘75 Only, Rear Glass and Aux. Hard Top glass, same as above. Vert is vinyl plastic, “VINYLITE” trademark, AS6 rating, mfg, date code, windo wash instructions hot stamped lower left outside corner. Date Code is Month/YR.

‘75 to ‘76 Other Changes:
Fake vents on rear deck eliminated
One piece Corvette rear name plate
Coupe only production

C'ya do that 10yr.+ resto... Every part number and date code matching... Good Luck!!! HAHAHA!!
Noted ;)
 
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