Manley Chevy LS-1, LS-2 Small Block 1.550 Pro Flo Severe Duty Exhaust Valves (Set of 8)

Manley Chevy LS-1, LS-2 Small Block 1.550 Pro Flo Severe Duty Exhaust Valves (Set of 8)

Marsoni

M251S

$163.60

Get it in 3 business days with 1 day shipping. Friday, May 29

Manley Chevy LS-1, LS-2 Small Block 1.550 Pro Flo Severe Duty Exhaust Valves (Set of 8)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 cycles, while competitors failed after just

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The plates have a tiny amount of twist in the center and quite a bit of doming when flexed. While the outer edges are entirely floppy. Most of the center is smooth, but there are rough patches that flake off paper pieces when rubbed with a spoon or from a lot of moisture from food. The flat surface (not the inner walls) was able to withstand still water for about 10 minutes before weakening, so I wouldn't use it for wet or very moist foods.

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Reviewed in the United States on May 28, 2026