Note: some of the following parts may not be available from the factory, or from parts
suppliers anymore. These parts and modifications were for competition purposes only and would not be legal for street use on emission
and non-emission equiped, 308 GT4's and 308 GTB/GTS models.
Engine block: |
107536 |
Crankshaft: |
105623 |
Harmonic balancer (without air conditioner pulley): |
105160 |
Main bearings (Vandervell): |
Front: |
100036 |
Middle: |
4118992E |
Rear: |
100037 |
Connecting rod bearings (Vandervell): |
130 14447 |
Connecting rods (Bolts: "F1", gr.M): |
251F/140172 |
Pistons (Borgo "7709", 81mm, 310gr., Comp. ratio: 9.7:1): |
251F/140174 |
Piston rings (Borgo 81mm): |
1st - 33'1433'002 PKB |
(1.5 x 3-) |
2nd - 33'6372 Ros. |
(1.5 x 3-) |
3rd - 33'6420 002 |
(2.8 Mo) |
Piston pins: |
14487 |
Cylinder liners (enlarged 0.03 - 0.04mm): |
103588 |
Cylinder heads (ported and polished): |
103514 |
105939 |
Valves: |
Intake: |
103575 |
Exhaust (X-Rayed): |
106533 |
Valve seats: |
Intake: |
105722 |
Exhaust: |
102859 |
Valve guides: |
102857 |
Valve springs: |
Inner: |
100239 |
Outer: |
100240 |
Camshafts (mild heat-treated core, nitrided surface): |
107188 |
107189 |
107190 |
107191 |
Timing belts (standard tensioners): |
102877 |
Water pump (modified to 107230): |
107128 |
Carburetor velocity stacks: |
105736 |
Camshaft timing (at 0.5mm lash): |
Intake: 51° BTDC/58° ABDC |
Exhaust: 64° BBDC/44° ATDC |
Valve lash (cold): |
Intake: 0.15 - 0.20mm |
Exhaust: 0.20 - 0.25mm |
Distributor: Marelli S159A with R1 points only and stiffer advance springs |
Ignition advance: |
34° @ 5000RPM |
13° @ 3600RPM (distributor readings) |
Spark plugs: Champion N60Y |
Carburetors: |
Weber 40DCNF 35/36/37/38 |
Main venturi (choke): 36mm |
Main jets: 160 |
Air correctors: 175 |
Idle jets: 0.60 |
Idle air correctors: 1.60mm |
Float level: 48mm |
Needle valve: 1.75 |
Progression holes: 080,140,130,160,080 |
Pump discharge: 040 |
Pump jet: 045 |
Bleed valve: 050 |
Emulsion tubes: F6 (see note below...) |
(NOTE: "F6" are DCOE emulsion tubes. It is unknown to the Webmaster if this is an
error - it could be a mistake for "F26", which is a proper DCNF emulsion tube - or if
they actually modified the carburetors to use these bigger "F6" emulsion tubes.) |
Alternator: Marelli-Fiat A 12'124'12'57 with special support |
Starter: Marelli-Fiat E 100'15'12 |
Oil pump: Standard. Windage tray (103929) is modified to collect oil returning from heads
and supply it to the sump well. A spring-loaded valve located on the left side of the car, provides an
external oil fill. A sight tube indicates level. Sump baffles near pick-up tube are boxed to provide
a reserve during hard cornering. |
Air intake box: Modified with new inlet and flexible hose on right side from an external
duct (see photo above). |