Both intake and exhaust valves are manufactured from 21-4N stainless steel, which is recognised as a quality material for both performance and race applications. 21-4N materials is able to withstand the high engine temperatures and extreme heat created by turbo and supercharged engines.

Stellite tip, hard chrome stem fully swirl polished

1.675 intake diameter

1.425 exhaust diameter

Through 35 years of porting and modifying Holden engines we always prefer and recommend these valves sizes for any mild to wild portjob.