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| MGB Production Modifications, Dec 1973 - Apr 1977 | ||||
| Date | Roadster Chassis No. |
GT Chassis No. |
Remarks © 1994 Orin B. Harding (Last Revised: 24-May-94) |
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Dec-73 |
5-328101 |
5-328801 |
1974 model year |
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Dec-73 |
Began making changes to engine bay layout to make common with V8 - Completed changes at start of '77 model year (car # 410001) |
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Dec-73 |
Radial tires made standard |
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Dec-73 |
Automatic gearbox withdrawn - None sold in North America |
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Dec-73 |
Sequential seat belt system with buzzer and warning light added - N. America |
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Dec-73 |
GT withdrawn from California market - Continued to be sold in 49 states and Canada |
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Jan-74 |
5-338790 |
5-338560 |
First serial # this calendar year |
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Early 74 |
5-339095 |
5-339472 |
N. American spec cars fitted with large "Sabrina" vertical rubber overriders |
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1974 |
5-345042 |
5-342851 |
Late style side lift jack change point. Jack has flat top where crank arm attaches |
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5-347180 |
Alternator pulley changed from 2.75" Dia. (belt 35.5" long) to 2.375" Dia. withbelt 35" long |
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Aug-74 |
A.C. (US made) Fuel pump (BLM Part # 601010) approved as replacement of SU AUF 305 fuel pump |
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Sep-74 |
5-360301 |
5-361001 |
1975 model year - UK market |
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Sep-74 |
Rubber bumpers |
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Sep-74 |
Ride height increased |
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Sep-74 |
Energy absorbing steering column standard in all cars |
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Sep-74 |
Single 12 volt battery |
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Sep-74 |
Overdrive ratio changed from 0.8021:1 to 0.82:1 |
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V-8 type engine mounts |
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Sep-74 |
5-360301 |
5-361101 |
1974 ½ model year - N. American (except California) market |
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Twin Carburettor, no catalytic converter |
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5-363423 |
Seat belt interlock system deleted. Sequential light and buzzer retained |
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Dec-74 |
5-367720 |
1975 model year - Roadster - N. America (18V engine, Z-S carb) |
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Dec-74 |
5-367803 |
GT withdrawn from N. American market - No GT’s sold as '75 models in US |
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Dec-74 |
Single Zenith-Stromberg carburettor - N. America |
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Dec-74 |
Catalytic converter - California specification cars |
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Dec-74 |
Servo assist brakes made standard for dual line system equipped cars - N. America |
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Dec-74 |
MG badges on front bumper, boot lid, and Centre of steering wheel now gold and black for 50th anniversary (1975 cars only) |
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Dec-74 |
MGB badge removed from boot lid |
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5-367902 |
Alternator fan belt changed from 35" long to 37.38" long |
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Jan-75 |
5-368090 |
5-369101 |
First serial # this calendar year |
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Apr-75 |
Hypoid SAE 90 oil approved for use in gearboxes (OD and non-OD) of all MG cars |
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May-75 |
"Jubilee Special" to commemorate MG’s 50th anniversary. 750 cars built |
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Jun-75 |
5-380278 |
5-379495 |
Overdrive standard - UK Market |
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Sep-75 |
5-386601 |
1976 model year |
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Sep-75 |
Catalytic converter on all US cars |
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Sep-75 |
MG badges change back to silver and black |
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Jan-76 |
5-393763 |
5-394665 |
First serial # this calendar year |
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Jun-76 |
5-410001 |
5-410351 |
1977 model year |
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Aug-76 |
Front anti-roll bar thickened from .531" to .625" |
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Aug-76 |
Rear anti-roll bar standard |
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Aug-76 |
Fascia redesigned |
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Aug-76 |
Electric clock standard |
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Aug-76 |
2 speed heater fan |
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Aug-76 |
"Deckchair" seat inserts - UK market cars |
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Aug-76 |
Head restraints standard - All markets |
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Aug-76 |
Twin radio speakers in doors and radio aerial standard |
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Aug-76 |
Overdrive switch moved to gear change knob |
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Aug-76 |
Four spoked steering wheel |
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Aug-76 |
Steering lower geared (3.5 Vs 3.0 turns lock to lock) |
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Aug-76 |
Engine cooling system sealed with catch tank added |
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Aug-76 |
Electric radiator cooling fan ( 2 for N. America and Japan) |
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Aug-76 |
Engine bay now common with V8 layout (changes started at car #328101) |
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Aug-76 |
Petrol tank capacity reduced from 12 to 11 imperial gal. |
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Aug-76 |
New soft top (hood) with zip out rear window |
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Aug-76 |
Pedal positions altered to allow "heel-and Toeing" |
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Aug-76 |
Halogen Headlights - UK Market cars |
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Aug-76 |
Tinted glass - GT - All markets |
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5-415001 |
5-412301 |
Fuel pick-up made integral with tank level sending unit |
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5-417229 |
One piece speaker assembly with white plastic water deflector. |
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10-Sep-76 |
1-2903 |
Last MGB-GT V8 produced Note: Total V8 production of 2,591 is generally accepted with no explanation of difference between car # and total production given. There was apparently one additional MGB-GT V8 built to 1977 UK specifications after chassis #1-2903 and this car is now in private hands. Thus total production may have been 2,592 cars. |
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Jan-77 |
5-424748 |
5-422730 |
First serial # this calendar year |
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5-425297 |
5-422792 |
Fuel Pump changed from AUF305 to AZX1307 |
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Apr-77 |
Inertia reel seat belts standard - All markets |
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5-437181 |
5-436465 |
Dual line brake system with servo made standard for UK cars. Note that change began at car 5-436465 and 69 cars between this number and 5-439568 could have either system fitted. See reference #12 for a listing of these cars. |
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