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300ZX
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300ZX
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Set of 6 reinforced inlet valves for NISSAN VG30T (300ZX Z31, Fairlady Z, Cedric, Gloria, Leopard).
The VG30T is Nissan's 3.0 litre turbo V6 with one overhead camshaft per bank and two valves per cylinder. From 1984 to 2004 it powers the 300ZX and Fairlady Z Z31, the Cedric Y31 and Y32, the Gloria Y30 and Y31 and the Leopard F30, from 194 to 258 hp.
It has 6 inlet valves, Nissan part number 13201-V5202, shared with the naturally aspirated VG30, held by 13210-01M01 collets. Raised boost or a sharper camshaft load them well beyond stock use.
The inlet valve lets in the air compressed by the turbo, drops back onto its seat on every cycle and slides constantly in its guide. It runs between 400 and 550 °C: at 600 °C an original chrome-silicon steel falls to 250 MPa against 500 MPa at 500 °C, 50 % of its strength lost.
These FERREA valves belong to the Competition Plus range, stainless steel with a chrome stem: the range brings 20 % more hot strength and fatigue resistance and extends seat life by 25 %.
They come in standard size (42 mm head) and +1 mm oversize (43 mm head), with a 7 mm stem and a length of 125.85 mm. The 43 mm head widens the passage at the seat: the cylinder fills better, provided the 6 inlet seats are cut to this diameter.
| Part number | Brand | Size | Head Ø | Stem Ø | Length | Grooves | Material |
|---|---|---|---|---|---|---|---|
| F1843P*6 | FERREA | Standard | 42 mm | 7 mm | 125.85 mm | Stainless, chrome stem | |
| F1844P*6 | FERREA | +1 mm | 43 mm | 7 mm | 125.85 mm | Stainless, chrome stem |
F1843P*6 and F1844P*6: 4.5 mm stem tip.
| Part | NISSAN original | Reinforced |
|---|---|---|
| Collets | 13210-01M01 | |
| Valve stem seals | 13207-D0111 / 13207-21002 | |
| Valve guide | 13212-V5010 / 13212-V5011 |
The +1 mm oversize needs the inlet seats cut to 43 mm; in standard size the seats keep their diameter.
The VG30T has hydraulic tappets: there is no valve clearance to set on reassembly.
 | FERREA Racing Components was founded in 1978 in Fort Lauderdale, Florida, by two engine builders of Argentine origin. Each valve is forged in one piece from bar stock then finished on CNC machines, and is found in NASCAR and dragster engines. |
Both valves share the material, stem and length: only the size changes.
| Criterion | Option 1 | Option 2 |
|---|---|---|
| Size | Standard size 42 mm head, for seats still at factory size: F1843P*6. | +1 mm oversize 43 mm head: about 10 to 12 cfm more per mm of head. Seats to be cut; also makes up for seats already reground. F1844P*6. |
| Model | Engine code | Power | Years |
|---|---|---|---|
| 300ZX (Z31) 3.0 Turbo | VG30T | 203-228 hp | 1984-1990 |
| Fairlady Z (Z31) 3.0 Turbo | VG30T | 203 hp | 1984-1989 |
| Gloria VII (Y30) 3.0 Turbo | VG30T | 230 hp | 1984-1987 |
| Gloria VIII (Y31) 3.0 Brougham VIP Hardtop | VG30T | 194 hp | 1987-2004 |
| Cedric Hardtop (Y31) 3.0 | VG30T | 194-258 hp | 1987-1991 |
| Cedric (Y32) 3.0 | VG30T | 226 hp | 1991-1995 |
| Leopard (F30) 3.0 | VG30T | 230 hp | 1984-1986 |
OEM part number (inlet valve): 13201-V5202
For rebuilt VG30T cylinder heads, the reinforced exhaust valves are offered on this page:
| NISSAN 300ZX Z31 VG30T exhaust valves → |
