Regarded as the most sophisticated of the early Monaro models, the HG is today one of the rarest and most sought-after of the charismatic Holden coupes. Holden designers cleverly removed the detail from the HG's rear lights, providing the illusion of extra size as the lights merged smoothly with the black GTS tail panel. While the more subtle HG mesh grille revived the simplicity of the first Monaro, GTS blackouts highlighted the bold new centre division and surrounds. The deletion of sill and wheel arch mouldings and the addition of black rocker panels around the lower body gave the HG GTS a meaner, sleeker look. Subtle 'sidewinder' stripes that swooped from the rear pillars to the front highlighted the flow in the original Monaro shape. New decals for the 350 engine were a Monaro first. New metallic colours and the lack of bold bonnet and bootlid stripes reflected a clean custom look and highlighted the 350's quad exhausts. Engine choice was the same as for final HT models after the local 308 V8 replaced the Chevrolet 307. A new three-speed Trimatic auto option replaced the Powerglide on all models except the big 350. Although virtually retired from competition duties - replaced by the XU-1 Torana - the Monaro still managed an amazing year on the track. Norm Beechey's Monaro dominated the Australian Touring Car Championship against serious competition and there was an outstanding Bond/Roberts endurance victory at Surfer's Paradise. Away from the track, Holden built extra compliance into the Monaro rear suspension, boosting GTS 350 long distance touring capabilities and comfort. The HG GTS 350 manual, with its crisp driving feel and Salisbury limited slip diff, stood as the definitive road car for several Monaro generations. DATE OF INTRODUCTIONJuly 1970NUMBER BUILT6,147MODELSMonaro CoupeMonaro GTS Monaro GTS 350 PRICES AT RELEASEMonaro (161 ci six & 3 speed manual) - $2765,Monaro GTS (186 ci six & 4 speed manual) - $3323, Monaro GTS 350 (5.7 V8 & 4 speed manual) - $4174 ENGINES161ci (low compression engine)Capacity 161 ci (2640 cc) OHV six cylinder inline, front engined, rear wheel drive One barrel downdraught Bendix Stromberg carburettor Bore and stroke 3.375 inches (85.7 mm) (85.7 mm) x 3.00 inches (76.2 mm) Power output (DIN):108 bhp (80.6 kW) at 4400 rpm Torque (DIN):146 lb/ft (197 Nm) at 2000 rpm Compression ratio:8.2:1 161ci (high compression engine) Capacity 161 ci (2640 cc) OHV six cylinder inline, front engined, rear wheel drive One barrel downdraught Bendix Stromberg carburettor Bore and stroke 3.375 inches (85.7 mm) (85.7 mm) x 3.00 inches (76.2 mm) Power output (DIN):114 bhp (85 kW) at 4400 rpm Torque (DIN):157 lb/ft (211.9 Nm) at 2000 rpm Compression ratio:9.2:1 186 ci (3050 cc) Capacity:186 ci (3050 cc) OHV six cylinder inline, front engined, rear wheel drive One barrel downdraught Bendix Stromberg carburettor Bore and stroke:3.625 inches (88.8 mm) inches x 3.00 inches (76.2 mm) Power output (DIN):130 bhp (97 kW) at 4400 rpm Torque (DIN):181 lb/ft (244.3 Nm) at 2000 rpm Compression ratio:9.2:1 186S (3050 cc) OHV six cylinder inline, front engined, rear wheel drive One barrel downdraught Bendix Stromberg carburettor Bore and stroke:3.625 inches (88.8 mm) inches x 3.00 inches (76.2 mm) Power output (DIN):145 bhp (108.2 kW) at 4600 rpm Torque (DIN):184 lb/ft (248.4 Nm) at 2200 rpm Compression ratio:9.2:1 253 V8 (4149 cc) Capacity 253 ci (4149 cc) OHV V8, rear wheel drive, rear wheel drive Single two barrel Bendix Stromberg WW downdraught carburettor Bore and stroke:92.08 mm x 77.77 mm Power output (DIN):185 bhp (138 kW) at 4400 rpm Torque (DIN):262 lb/ft (353.7 Nm) at 2400 Compression ratio:9:1 308 ci (5047 cc) OHV V8, rear wheel drive, rear wheel drive Single four barrel Rochester Quadrajet downdraught carburettor Bore and stroke:4.0 inches (101.6 mm) x 3.062 inches (75.0 mm) Power output (DIN) 240 bhp (179.0 kW) at 4800 rpm Torque (DIN) 315 bhp (434 Nm) at 3000 rpm Compression ratio 9.0:1 350 ci (5740 cc manual transmission) OHV V8, rear wheel drive, rear wheel drive Single four barrel Rochester Quadrajet downdraught carburettor Bore and stroke:4.0 inches (101.6 mm)x 3.480 inches (85.26 mm) Power output (DIN):300 bhp (223.8 kW) at 4800 rpm Torque (DIN):380 lb/ft (513 Nm) at 3200 rpm Compression ratio:10.25:1 350 ci (5740 cc automatic transmission) OHV V8, rear wheel drive, rear wheel drive Single four barrel Rochester Quadrajet downdraught carburettor Bore and stroke:4.0 inches (101.6 mm)x 3.480 inches (85.26 mm) Four barrel Rochester Quadrajet downdraught carburettor Power output (DIN):275 bhp (205.1 kW) at 4800 rpm Torque (DIN):365 lb/ft (492 Nm) at 3200 rpm Compression ratio:9.0:1 TRANSMISSIONSThree-speed manual. (Synchro in 2nd & 3rd)Three-speed manual. (All synchro. Column shift), 253 and six cylinder engines Four-speed all synchro manual. M21 four-speed all synchro manual. Two speed Powerglide automatic Three speed Trimatic automatic ENGINE/TRANSMISSION COMBINATIONS161 engine standard on Monaro, 186, 186S, 253 and 308 optional.186S standard on Monaro GTS, 253 and 308 optional. Three speed column shift manual standard on Monaro, Trimatic automatic optional. Four speed floor shift manual standard on Monaro GTS, optional with floor shift only. Four speed heavy duty manual standard on GTS 350, Powerglide with floor shift optional BRAKESFront:Drums are standard with six cylinder models, power assistance optional.Power assisted discs standard on Monaro GTS and V8s. Front 10.5 inch (268 mm) discs Rear 10 inch (254 mm) drums WHEELSMonaro and Monaro GTS - 5.00JJx14V8 GTS - 6.00JJx14 INSTRUMENTS/CONTROLSMonaro - Speedo, fuel gauge, water temperature, oil pressure and generator charge warning lights.GTS - Speedo, tacho, fuel gauge, oil pressure, ammeter, generator charge warning light, water temperature gauge, handbrake warning light. EXTERIOR DIMENSIONSTotal length (inches/mm):184.8 inches (4527.6 mm)Total width (inches/mm):71.8 inches (1759.1 mm) Wheelbase (inches/mm):111 inches (2719.5 mm) KERB WEIGHTMonaro 161 - 2897 lbs (1315.3 kg).GTS 186S - 2947 lbs (1337.9 kg) lbs GTS 350 - 3386 lbs (1530 kg) TURNING CIRCLE36.5 ft (10.7 m).FUEL TANK CAPACITYAll models except GTS 350 - 16.5 gallons (75 litres)GTS 350 - 25 gallons (113.7 litres) ENGINE NUMBERSLocated stamped on a pad at the front of the right hand cylinder bank.The prefixes for the HG GTS 350 Monaro automatic is '327A' and the manual '350M'. The engine serial number follows. BODY/CHASSIS NUMBERSLocated stamped on a plate attached to the right hand side of the firewall. The first five numbers of the 13 digits is the model number.80337 - Monaro Coupe 80437 - Monaro Coupe 80837 - Monaro GTS Coupe 81837 - Monaro GTS 350 Coupe The next letter is the series code G for HG Monaro The next two digits are a letter/number combination indicating the plant at which the vehicle was built H1-H4 - Brisbane H5-H9 - Sydney J1-J9 - Melbourne L1-L5 - Adelaide L6-L9 - Perth The remaining five numbers is the vehicle serial number represent the sequence in which the vehicle was built at that particular plant. OTHER IDENTIFICATION MARKSGTS 350 - 'GTS' and 'Monaro' badges.Headlight bezels, grille, under front and rear bumpers, along sill panels, bonnet scoops and rear of boot lid blacked out. Four slanted vertical louvres in lower front guards. Low profile bonnet scoops both sides of bonnet.
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