Chevrolet Small Block gen. I 327 (1962)

Home » Racing Engines » Chevrolet Small Block gen. I 327

Fold

Table of Contents

Specifications

Dimensions

Construction materials

Cylinder-head

Aspiration

Ignition

Cooling and lubrication

Models used and Output

Drawings

Weber 48 IDA carburetor

Drawings

Lubrication

Specifications

Chevrolet Small Block gen. I 327, V8 (90^o) cyl, 4 stroke, petrol engine
Introduced in 1962
Click here and here and here and here
Click here
Click here for differences in main journals

5431cc, 102.3 x 82.6 mm
510 bhp / 392 KW @ 7000 rpm

Dimensions

Cylinders arrangement: V8 with 90º included angle
Strokes: 4

Bore x Stroke	Capacity
101.6 x 82.55 mm (4" x 3.25")	5354cc, 327ci
102.36 x 82.55 mm (4.03" x 3.25")	5431cc, 331.6ci
102.6 x 82.55 mm (4.04" x 3.25")	5461cc, 333.3ci

Construction materials

L84: cast iron block and head
aluminum block 229.2 mm (9".025) height, 111.76 mm (4.4") bore spacing, 2 bolts for crankshaft main bearing caps
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

Year	Main journal Diameter	Rod journal diameter
1962-67	58.4 mm (2.3")	50.8 mm (2")
1968-69	62.2 mm (2.45")	53.3 mm (2.1")

Cylinder-head

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

	Original cam	Melling cam	Cam 2
Intake Valve Lift	9.9 mm - 0.390"	10.7 mm - 0.422"	11.2 mm - 0.44"
Exhaust Valve Lift	10.4 mm - 0.410"	11.3 mm - 0.444"	11.3 mm - 0.445"
Int Duration at .050" Lift	195º	204º	210º
Ex Duration at .050" Lift	202º	204º	216º

Stock valves. Click Source
327 1962-68 1.720 Intake Valves
327 1962-69 1.940 Intake Valves
327 1965-69 2.020 Intake Valves
327 Stock Stellite 1.500" exhaust valves

2 valves per cylinder - 16 valves total, 49.3 mm (1.94") inlet valve diameter, 38.1 mm (1.50") exhaust valve diameter.
1964+: 51.3 mm inlet valve diameter, 40.64 mm exhaust valve diameter
both valves on the same plane, 23 degrees valve plane angle from vertical

Aspiration

Natural with 4 x Weber Carburetors:

Weber 45 DCOE
Weber 48 DCOE
Weber 48 IDA
Weber 48 IDM

or 1 x Holley quad choke
or GM-Rochester Ramjet Mechanical multipoint fuel injection. Click here

Ignition

Single NGK R5671A-7 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	Compression ratio	Power	Torque
1962	Lister Costin	GM-Rochester MFI	11.25:1	360 HP @ 6000 rpm	352 ft lbs (476 Nm) @ 4000
1962	Lister Knobbly	4 x Weber 45 DCOE	11.25:1	350 HP @ 6000 rpm
1963	Chevrolet Corvette C1 L84	GM-Rochester MFI	11.25:1	360 HP @ 6000 rpm	352 ft lbs (476 Nm) @ 4000
1963	Chaparral 2A	4 x Weber 48 DCOE	11.0:1	415 bhp / 6800 rpm	380 lbs ft / 5200 rpm
1963	Chevrolet Corvette C2 L84	GM-Rochester MFI	11.25:1	360 HP @ 6000 rpm	352 ft lbs (476 Nm) @ 4000
1964	Iso Grifo A3 Corsa	4 x Weber 45 DCOE	11.0:1	405 bhp / 302 KW @ 6200 rpm	488 Nm / 360 ft lbs @ 4000 rpm
1964	Bizzarrini 5300 GT Strada	4 x Weber 45 DCOE	11.0:1	405 bhp / 302 KW @ 6200 rpm	488 Nm / 360 ft lbs @ 4000 rpm
1965	Lola T70	4 x Weber 48 IDA	10.0:1	450 HP @ 7100 rpm	400 lb-ft @ 5600 rpm
1966	Chaparral 2D	4 x Weber 48 IDM	10.0:1	420 bhp / 313 KW @ 6800 rpm
1966	Lola T70 Mk 2	4 x Weber 48 IDA	10.0:1	400 HP	400 lb-ft @ 5600 rpm
1967	Lola T70 Mk 3 GT, 5460cc	4 x Weber 48 IDA	10.0:1	510 bhp / 392 KW @ 7000 rpm
1967	McLaren M1B, 5431cc	4 x Weber 48 IDA	10.0:1	510 bhp / 392 KW @ 7000 rpm