A...cómo se hacen las cosas...

Extraído del manual técnico de la GM, en su venta de motores para el "Circle Track"...
Página 21...

Valve Spring Specifications

Below is illustration of a typical valve spring. Match up the locations and engine part number with the chart below for the correct specification.

Note: These specifications are for new valve springs.

The specification chart shows free height, installed height, spring o.d., installed pressure, open pressure, etc.

Keep in mind that new spring pressures have some variances. The chart notes the two important variances. Installed pressure & open pressure.

Valve spring pressures will change depending on length of time engine is in service, temperature during that period, and if the engine has been excessively overrevved.

It is acceptable to add maximum of a .020” shim when valve seats are recut or to

get spring pressures back to proper factory specifications. Care must be taken to make

sure retainer to guide clearance is adequate.

No Titanium Retainers Allowed.

Valve Spring Specifications - New

Description                             88958602 / 19258602            88958603       88958604

Valve Spring P/N                             10212811                               12551483            12551483

Diameter (A)                                     1.250"                                    1.32"                    1.32"

Free Height (B)                                 2.021"                                    2.145"                  2.154"

Installed Height (C)                          1.70"                                      1.78"                    1.78"

Lbs @ Installed Height (+/- 4 lbs) (D)  80 lbs                                   101 lbs                 101 lbs

Open Height (E)                                 1.270"                                   1.300"                  1.300"

Open Pressure (+/- 8 lbs) (F)                195 lbs                                 260 lbs                 260 lbs

Coil Bind (G)                                       1.20"                                     1.21"                    1.21"

Wire Diameter                                      .177"                                     .178"                    .178"

Los datos son bastante claros, como para traducirlos...lo único que se podría decir es, que los americanos plus ultra, identifican los motores con una serie numeral, pero se entienden entre ellos abreviando la numeración, por lo tanto, los denominan 602, 603, 604...
Bien, hasta aquí un pedacito de algo a controlar...pero, que controlan...controlan...

Valve Spring Inspection Procedure

This section helps identify those teams that have changed valve springs in an effort to gain additional rpm’s. It is important to keep rpm’s within GM recommended numbers. Engine life and wear is severely reduced for every 100 rpm’s that an engine is over-revved.

Purpose

Check for proper stock valve spring specifications. Use Moroso p/n 62390.

Step 1.  Have the crew chief remove all debris in and around the engine

Step 2.  Have the crew chief remove the valve cover being careful not to contaminate the cylinder head

Step 3.  Have the crew chief remove both rocker arms from the selected cylinder & make sure piston is at BDC.

Step 4.  Slide the Moroso valve spring tester into position so that intake valve

spring sits in tester pocket

Step 5.  Pull the handle to compress the valve spring to full compression and

note the reading. Repeat the test for the exhaust valve spring and note the

reading

Step 6.   Refer to chart in rebuild section for correct valve spring pressures for the intake & exhaust.

Use the space below to reference the numbers for your application.

Int.________ Exh.________

En el procedimiento a la inspección de los resortes de válvulas...bien clarito, lo dice...el tema son los "perreros"...y esta jauría, quiere rajar rápido, tanto allá, como acá...pero los yanquis están en todo...y la herramienta la tienen...

Por las dudas, y más clarito...

no me van a decir, que algún pichicho no entiende...

Algunas veces, tendría que preguntarse uno, si emular, imitar, copiar...es lo mismo...