As more and more racing engine builders move toward employing
reduced-stem valves as a means for increasing RPM potential, SI Valves
has expanded its inventory of valve “blanks” to include a wide range of
stem sizes ranging from 5.5mm to 9mm in both premium stainless steel
and Inconel alloys.
To compliment the custom valve stem sizes SI offers matching valve
guides. They are manufactured in-house from a proprietary manganese-
bronze alloy that is fortified to enhance wear characteristics and has
exceptional heat transfer capabilities. The guides are compatible with all
contemporary valve stem finishes.
Recently stocked valve guide applications include:
• Ford Godzilla 7.3 (Intake & Exhaust)
• Late model Ford EcoBoost 3.5 (Intake & Exhaust)
• New Mitsubishi 2.0 4B11 (Intake & Exhaust)
• Ford FE conversion 11/32” stem (from 3/8 – Intake & Exhaust)
• GM Late 5.3 Direct injection Engine Valves (Intake & Exhaust)
• GM Late 6.2 Direct Injection Engine Valves (Intake & Exhaust)
• Toyota 18RG (Intake & Exhaust)
• Nissan KA24 3V (Intake & Exhaust)
• Ford Coyote Gen1 / Gen 2 Inconel Exhaust valve
• Ford 4.6 4v modular Inconel Exhaust
• Ford 5.2 Voodoo Valves (Intake & Exhaust)
• GM 305 early early V6 stainless Exhaust
