Torque Reference

Porsche 356

Type 547 / 616 pushrod four-cam-cover engine — 356 / 356A / 356B / 356C (1100–1600 SC).

Head bolt procedure

Cylinder head nuts — torque in three even stages working from the centre outwards in the factory sequence.
Stage 1: 15 Nm (11 lb-ft).
Stage 2: 25 Nm (18 lb-ft).
Stage 3: 34 Nm (25 lb-ft). Re-torque after first warm-up.

Fastener	Nm	lb-ft
Connecting rod nuts — 32 lb-ft	43	32 lb-ft
Crankcase through-bolts — 8 mm — 14 lb-ft	19	14 lb-ft
Crankcase through-bolts — 10 mm — 25 lb-ft	34	25 lb-ft
Main bearing perimeter nuts — 8 mm — 14 lb-ft	19	14 lb-ft
Cylinder head nuts (cold, in stages) — 25 lb-ft	34	25 lb-ft
Rocker shaft hold-down nuts — 14 lb-ft	19	14 lb-ft
Flywheel gland nut (crankshaft) — 217 lb-ft	294	217 lb-ft
Crankshaft pulley bolt — 43 lb-ft	58	43 lb-ft
Camshaft retaining nut — 80 lb-ft	108	80 lb-ft
Oil pump cover nuts — 14 lb-ft	19	14 lb-ft
Oil drain plug (sump plate) — 15 lb-ft	20	15 lb-ft
Sump plate nuts — 5 lb-ft	7	5 lb-ft
Clutch pressure plate to flywheel — 18 lb-ft	25	18 lb-ft
Spark plugs (M14) — 24 lb-ft	32	24 lb-ft
Generator pulley nut — 35 lb-ft	47	35 lb-ft
Fan housing / muffler clamp nuts — 14 lb-ft	19	14 lb-ft
Exhaust to cylinder head nuts — 18 lb-ft	25	18 lb-ft
Engine mount to transmission nuts — 18 lb-ft	25	18 lb-ft
Engine carrier to body bolts — 25 lb-ft	34	25 lb-ft

Source: Porsche 356 Workshop Manual factory torque tables (Type 547/616). Always verify against the specific variant (1100, 1300, 1500, 1600 N/S/SC) and the latest Porsche technical bulletins.

Conversions are rounded (1 Nm ≈ 0.7376 lb-ft). Always torque in the correct sequence and in stages. Verify against your engine builder's instructions for performance or modified assemblies.