Manley Big Block Chevy 2.350in Diameter 0.350in Longer Length Extreme Duty Exhaust Valves - Set of 8 SPECIAL-ORDER they have achieved a cooling

they have achieved a cooling effect of approximately 5 degrees C or more at the minimum intake air temperature and approximately 15 degrees C or more at the maximum intake air temperature under full normal conditions

2006-2012 Porsche 911 (997) without PASM Carrera 4/4S

0mm Stem Manganese Bronze Exhaust Valve Guide - Single (Drop Ship Only)

CSF went through several different prototypes using cores of varying thicknesses

32 percent increase in core volume over stock for improved cooling efficiency

Manley Big Block Chevy 2.350in Diameter 0.350in Longer Length Extreme Duty Exhaust Valves - Set of 8 SPECIAL-ORDER they have achieved a coolingManufacturer Part # : 11880 8 Market Description Manley Severe Duty Valves deliver the ultimate in strength, reliability, and high performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH 428 for exhaust and NK 844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400F, Manley exhaust valves endured 100 million