| |
Buick |
Oldsmobile |
Rover (1968 P5 spec's) |
| Compression |
8.8 |
8.75 |
10.5 |
| Combustion chamber |
machined combustion chamber, dished pistons |
Larger machined combustion chamber, flat pistons |
Cast combustion chamber, dished pistons |
| Cylinderhead |
Five bolts per cylinder |
Six bolts per cylinder |
Five bolts per cylinder |
| Valves |
1.480 inch inlet
1.300 inch outlet |
1.522 inch inlet
1.30 inch outlet
Valve stem diameter 0.002" thicker and 0.25" longer than Buick |
1.50 inch inlet
1.30 inch outlet |
| Valve springs |
straight |
conical |
straight, double coil |
| Camshaft |
timing 29/71/67/33
Rocker ratio 1.6 |
timing 29/71/67/33
Rocker ratio 1.6 |
timing 30/75/68/37
Rocker ratio 1.5 |
| Block |
Aluminium pressure die-cast |
Aluminium pressure die-cast |
Aluminium sand cast |
| Cylinder liners |
Iron liners placed into the pressure die before
casting the block |
Iron liners placed into the pressure die before
casting the block |
Iron liners pressed into the block after sandcasting
the block |
| Rocker cover |
Stamped steel |
Stamped steel |
Aluminium casting |
| Carburettor |
2 or 4-barrel Rochester |
2 or 4-barrel Rochester |
Two 1 3/4' SU HS6 carbs |
| Engine weight |
144 kg
318 lb |
159 kg
350 lb |
170 kg
375 lb |
| Power |
150 bhp at 4400 rpm |
155 bhp at 4800 rpm |
160 bhp at 5200 rpm |
| Torque |
210 lb.ft at 2800 rpm |
220 lb.ft at 2400 rpm |
210 lb.ft at 2600 rpm |