McLaren M12 group 7 (1969)
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Home » Racing Sports Cars » McLaren M12

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Chassis numbers

Specifications

15 units built
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Click here for Chevrolet 427
Click here for Chevrolet 388
Click here for Chaparral 494

Chevrolet Big Block Mark IV 427 ZL1, V8 (90o) cyl, 4 stroke, petrol engine
6997cc, 108 x 95.5 mm
12.5:1
615 HP / 459 kW
460 lb·ft (620 N·m) @ 5200 rpm
356-T6M Aluminum Block with 248.9mm deck height and 123mm bore spacing, aluminium alloy head
forged premium alloy 5140 steel crankshaft with 5 main bearings, 70mm diameter
Moraine M400 aluminum plain main bearings
connecting rod length between centers 155.8mm
side camshaft with overhead valves (OHV). 2 valves / cylinder - 16 valves total
aspiration, natural with Lucas Mark II mechanical fuel injection
firing order: 1-8-4-3-6-5-7-2
water cooled
dry sump

Chevrolet Big Block Mark IV 494, V8 (90o) cyl, 4 stroke, petrol engine
8095cc
780 HP (574.08 KW) @ 7800 RPM
side camshaft with overhead valves (OHV). 2 valves / cylinder - 16 valves total
firing order: 1-8-4-3-6-5-7-2
water cooled
dry sump

Hewland LG600, 5 speed manual gearbox
Fiberglass body on bonded Aluminum monocoque chassis
Front suspension double wishbones, coil springs over dampers, anti-roll bar
Rear suspension top links, reversed lower wishbones, twin radius arms, coil springs over dampers, anti-roll bar
rack-and-pinion steering
Girling ventilated disks all round with12 inch diameter front and rear, with 16-3-LA calipers and dual hydraulic circuits
Length 3937 mm (155 in)
Width 1905 mm (75 in)
Height 787 mm (31 in)
Wheelbase 2375 mm (93.5 in)
Track (fr/r) 1448 mm (57 in) / 1397 mm (55 in)
wheels, front 10x15", rear 15x15"
tires, front 10.55-50-15", rear 12-50-15"
600kg, distribution 40/60% front/rear


Results in WSCC

No participation in WSCC


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Chaparral

Drawings

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