Editing Z31/camspecs php (section)

== Valve Springs ==

Valve springs are one of the most critical and most overlooked components in your engine. Proper selection begins with identifying the application and selecting all valvetrain components to achieve your engine goals.

The spring must be matched with the valvetrain to reach full potential. A cam built to rev to 8000 RPM is pointless without the right spring. Improper spring choice, incorrect installation, and mishandling are common causes of failure.

=== Selecting a Spring ===

* Choose springs that give correct seat and open pressures.
* Spring pocket may need to be machined to fit larger OD springs.
* Positively locate springs to avoid harmonic wear or forced failure. Proper seating offers longevity.

=== Proper Spring Handling ===

* Never clamp, pry, or strike valve springs. Surface damage causes premature failure.
* Separate double/triple springs with soft plastic tools only.
* Do not clean with aggressive or evaporative chemicals. Use the anti-rust coating as-is.
* Apply assembly lube before installation to prevent dry starts and increase spring life.

=== Nissan Valve Spring Part Numbers ===

| Application |
Part Number |
| 1983–1985 Outer Spring | 13203-V5000 |
| 1985–1989 Outer Spring | 13203-42L03 |
| 1983–1985 Inner Spring | 13204-W7000 |
| 1985–1989 Inner Spring | 13204-42L00 |

=== Schneider Spring Specs ===

| Description |
OD |
ID |
Installed Height |
Seat Pressure |
Pressure @ .600" |
Coil Bind |
Part Number |
| Spring set (12 inner & outer) |
1.380" |
0.810" |
1.600" |
110 lbs |
240 lbs |
0.910" |
68022 |

[[Category:Imported from Xenonzcar]]