What kind of applications are these valves best suited for?

These Manley Pro Flo E.D. exhaust valves are specifically designed for high-demand applications. This includes Top Fuel and Funny Car drag racing, as well as marine engine builds and circle track racing where extreme force and heat resistance are critical.

What makes the XH-432 XtremeAlloy material special?

XH-432 XtremeAlloy is Manley's hallmark material for exhaust valves in extreme performance situations. It's chosen for its exceptional ability to withstand the high temperatures and pressures found in demanding racing and marine engine environments, contributing to the valve's longevity.

Are any installation hardware or tools included with these valves?

This product listing is for a set of eight Manley Pro Flo E.D. exhaust valves only. Installation hardware, valve springs, retainers, or any specialized tools required for installation are not included and would need to be sourced separately.

Specifications

Brand: Manley Performance
Part #: 12357-8
UPC: 807298105956

Manley Chevy LS-3 / L-99 (L-92 Head) 1.600in Head Diameter Pro Flo E.D. Exhaust Valves (Set of 8)

Name: Manley Chevy LS-3 / L-99 (L-92 Head) 1.600in Head Diameter Pro Flo E.D. Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-ls-3-l-99-l-92-head-1-600in-head-diameter-pro-fl-t14-424892
Price: 596.61 USD
Availability: BackOrder

$596.61

On Backorder

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Manley Pro Flo E.D. exhaust valves for Chevy LS-3/L-99/L-92 heads. Set of 8, 1.600in head diameter.

Key Features

Fits Chevy LS-3, L-99, and L-92 cylinder heads.
Set includes 8 exhaust valves.
Head diameter is 1.600 inches.
Stem diameter is 0.3136 inches.
Overall length is 5.215 inches.
Constructed from XH-432 XtremeAlloy for extreme heat and force resistance.

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About this part

Product Details

If you're building a high-performance Chevy engine for serious competition, these Manley Pro Flo E.D. exhaust valves are a solid choice. Designed for demanding applications like Top Fuel drag racing, marine engines, and circle track racing, they're built to handle extreme heat and force. This set includes eight exhaust valves, each featuring a 1.600-inch head diameter, a 0.3136-inch stem diameter, and an overall length of 5.215 inches.

The key to their durability is the XH-432 XtremeAlloy material, which is known for its exceptional heat and force resistance. Manley also adds chrome stems and hard tips to further enhance wear resistance and longevity, meaning these valves can stand up to repeated stress. For improved airflow and combustion efficiency, the under-head areas are swirl polished, and the combustion faces are fully machined. These details help your engine breathe better and perform at its peak.

When you're pushing your engine to its limits, having reliable components is crucial. These Manley valves are a well-built option for anyone serious about maximizing their engine's performance and durability under extreme conditions.