Pro Series New Engine Prep
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(all information below is a recommendation from Race-1 not necessarily from GM)
Pro Series prep is done in conjunction with basic prep...
and includes any necessary springs and shims;
also includes lift plate, exhaust covers and FP block off.
Remove the valve springs and evaluate the given pressures.
Race-1 strives to have the intake springs within 3 to 5 pounds of allowable maximum OPEN pressure...
The exhaust springs will be at no less than the middle of specification (again, at OPEN pressure).
Remove the valve seal—check and clean any debris between the seal and valve guide and/or valve.
Check and adjust installed height to factor minimum.
The factory minimum specification is 1.780 inches.
Check specific rules for sanction running.
- Some sanctions do NOT permit shimming at all.
- Some sanctions only permit a .020 maximum shim (per GM manual).
- Many permit any amount of shim provided installed height remains greater than 1.780".