Chevrolet Small Block Gen I 302 (1966)

cast iron or aluminium alloy block 229.2 mm (9.025") height, 111.76 mm (4.4") bore spacing
A356 Aluminum Alloy head
tufftride-hardened forged 1053-steel crankshaft with 5 main bearings 58.4 mm (2.3") diameter, 50.8mm (2") big end bearing diameter
shot peened (a stress relieving process) steel connecting rod length between centers 144.8mm (5.7"), 5/16" bolts size, pressed in wrist pin
Manganese Bronze valve guides
1967+
tufftride-hardened forged 1053-steel crankshaft with 5 main bearings 62.2 mm (2.45") diameter, 53.3mm (2.1") big end bearing diameter
shot peened (a stress relieving process) steel connecting rod length between centers 144.8mm (5.7"), 3/8" bolts size, floating wrist pin

Cylinder-head

64cc combustion chamber
chain driven side camshaft with overhead valves (OHV). Click here

Intake Valve Lift	11.48 mm - 0.452"
Exhaust Valve Lift	11.56 mm - 0.455"
Int Duration at .050" Lift	229º
Ex Duration at .050" Lift	237º

78º overlap (at 0º lift)

2 valves per cylinder - 16 valves total, 51.3 mm (2.02") inlet valve diameter, 40.64 mm (1.6") exhaust valve diameter
both valve on the same plane, 23 degrees valve plane angle from vertical

Aspiration

Natural with 4 x Weber Carburetors:

Weber 48 DCOE
Weber 48 IDA
Lucas Mark II mechanical fuel injection

Ignition

Single spark plug per cylinder
Firing order, 1-8-4-3-6-5-7-2

Source

Cooling and lubrication

Water cooled
Dry sump

Models used and Output

Year	Model, Engine	Induction	Power
1967	McLaren M6	Lucas Mk II	500 bhp / 373 kW
1968	Lola T70 Mk 3 GT, 4991 cc	4 x Weber 48 IDA	425 bhp / 313 KW @ 6500 rpm
1969	Lola T70 Mk 3B, 4991 cc	4 x Weber 48 IDA	450 bhp / 336 kW @ 7000 rpm
1970	McLaren M8C	Lucas Mk II	500 bhp / 373 kW