Editing Forums/Z31P/z31-performance-upgrade-forums engine-mechanical-aa/Nissan VG valve differences

{{ForumImport
|op_user=Doug
|op_date=2014-01-28 03:07:15
|post_count=10
|archive_url=/Z31performance_archive/forum/z31-performance-upgrade-forums/engine-mechanical-aa/23262-nissan-vg-valve-differences.html
}}

'''Doug:''' <small>(2014-01-28 03:07:15)</small>

Nissan has used an number of valves for the various VG30 and VG33s with unknown performance differences and very different pricing - a full set of VG33E valves is just $53.58 from my local dealership while a full set of VG30ET is $135.36.

What I've found so far:

Year
Model
Intake
 $
Exhaust
 $

2002-2004
Xterra VG33ER
13201-0B000
 $ 4.14
13202-7B000
 $ 4.79

2000-2004
Xterra VG33E
13201-0B000
 $ 4.14
13202-7B000
 $ 4.79

1996-2000
Pathfinder VG33E
13201-V5202
 $ 7.18
13202-V5210
 unknown

1984-1989
300ZX VG30ET
13201-V5202
 $ 7.18
13202-V6510
 $ 15.38

1984-1989
300ZX VG30E
13201-V5202
 $ 7.18
13202-V6510
 $ 15.38

Ferrea
F1843P
 $ 23.68
F1844P
 $ 24.86

Mr. 510 [http://www.nissanpathfinders.net/forum/topic/31418-building-a-vg34-and-installing-it-in-my-88-pathy/?p=593884 posted] that there are special valves for supercharged VG33ERs on nissanpathfinders.net:

{{Quote|user=|}}

He even posted a picture:

But I get the same P/N for VG33ER and VG33E valves Xterras/Frontiers at courtesyparts.com and my local dealership. Questions I'm trying to answer:

- Are there special coated VG33ER valves? If so, what's the part number?

- Is there any meaningful difference between the older, more expensive VG30 valves and the newer, cheaper VG33 valves?

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'''G-E:''' <small>(2014-01-28 03:13:48)</small>

As I recall the z31 exhaust valves are sodium filled for better heat dissipation which is the first part, looks like the vg33r may have a different size or profile altogether

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'''Doug:''' <small>(2014-01-28 03:54:02)</small>

{{Quote|user=|}}

I'm not aware of any sodium valves in any VG30, easy enough to cut one up to check. The VG33ER heads are definitely identical OWO castings.

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'''88sinZ:''' <small>(2014-01-28 05:42:35)</small>

{{Quote|user=|}}

Uh… yeah, i wouldn't do that. Popping a sodium filled valves can be very hazardous, and i highly doubt Nissan would put them in as OE.

besides that, FSM section EM list valve dimensions/angles and seat dimensions/angles similar between Z31 VG30E(T) and VG33E(R)

IMAGE LINK

VG33E(R) SD&S

VG30E(T) SD&S

VG33E(R) Valve Seat SD&S:

INTAKE

Exhaust

VG30E(T) Valve Seat SD&S:

Word to ya momma.

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'''Doug:''' <small>(2014-01-28 19:21:59)</small>

Ordered 4 valves to compare: 13201-0B000 VG33E(R) intake, 13201-V5202 VG30E(T) intake, 13202-7B000 VG33E(R) exhaust, 13202-V6510 VG30E(T) exhaust. I'll post pics when they come in.

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'''NissanEgg:''' <small>(2015-02-07 18:14:58)</small>

What happened to the pic update?

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'''88sinZ:''' <small>(2015-02-08 05:18:22)</small>

The proof is above, what update do you need?

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'''NissanEgg:''' <small>(2015-02-09 13:55:44)</small>

Pics of the supposed valves without markings or the "ceramic" coating.

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'''jaqattack02:''' <small>(2015-02-09 14:15:22)</small>

{{Quote|user=NissanEgg|Pics of the supposed valves without markings or the "ceramic" coating.}}

Yeah, the picture is in the OP.

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'''NissanEgg:''' <small>(2015-02-09 21:51:46)</small>

I meant the pics of the actual valve differences that Doug was supposed to supply that shows the actual differences between all the part numbers.