What material are these exhaust valves made from?

These Manley exhaust valves are constructed from high-quality stainless steel. They also feature chrome stems and hard tips for added durability and wear resistance.

Are these valves suitable for high-performance or racing applications?

Yes, these are Manley's Race Series valves, designed for demanding applications like bracket, drag, and oval track racing. They are recommended for engines operating under 8000 RPM and are a good choice for alcohol engines.

What specific engine modifications do these valves complement?

The swirl polished under-head areas and fully machined combustion faces are designed to optimize airflow and combustion efficiency. This makes them a good match for cylinder heads that have been ported or otherwise modified to improve breathing.

Manley Pontiac 400 Exhaust Valve Kit 11353-8

Name: Manley Pontiac 400 Exhaust Valve Kit - 1.660in Head Dia. 5.230in O/A Length, 0.3415in Stem
Brand: Manley Performance
SKU: manley-performance-manley-pontiac-400-exhaust-valve-kit-1-660in-head-dia-5-230in-t14-880026
Price: 218.97 USD
Availability: BackOrder

Manley Pontiac 400 Exhaust Valve Kit - 1.660in Head Dia. 5.230in O/A Length, 0.3415in Stem

$218.97

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Pontiac 400 Exhaust Valve Kit - 1.660in Head Dia. 5.230in O/A Length, 0.3415in Stem. Stainless steel construction for durability.

Key Features

Fits Pontiac 400 engines.
Exhaust valves feature a 1.660-inch head diameter and 5.230-inch overall length.
Valves have a 0.3415-inch stem diameter.
Constructed from durable stainless steel for longevity.
Chrome stems and hard tips enhance wear resistance.
Swirl polished under-head areas and fully machined combustion faces optimize airflow.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

This kit gives you the exhaust valves you need for your Pontiac 400 engine rebuild. These are the exhaust valves only, designed to handle the heat and stress of performance applications. They feature a 1.660-inch head diameter and a 5.230-inch overall length, with a 0.3415-inch stem diameter, fitting specific Pontiac 400 cylinder heads.

Manley builds these Race Series valves from a high-quality stainless steel that holds up well under demanding conditions, especially if you're running alcohol fuel. The stems are chromed for better wear resistance, and the under-head area is swirl polished to help smooth out airflow into the cylinder. The combustion face is also fully machined, which helps improve how efficiently the engine breathes.

These valves are a solid option for engines that will see regular use and are often chosen for bracket, drag, or oval track racing where reliability is key, especially for engines running up to 8000 RPM. If you're rebuilding the top end of your Pontiac 400 and need exhaust valves that can handle the job, these are a well-built choice.