- Type: Exhaust Valve XH-432 Material
- Head Diameter: 1.590”
- Stem Diameter: 8mm / 0.3136”
- Installed Height: Stock
- Overall Length: 5.205”
- Tip Length: 0.160”
- Underhead Angle / Radius: 25° x 7/16”
- Margin: 0.075”
- Seat Width: 0.100”
- Top of Head: 18° Dish
- Weight / Grams: 102
Manley – Extreme Duty Exhaust Valve for LT1 / LT4 (12349-8)
$514.08
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- XH-432 Xtreme Alloy Material
- Swirl Polished and Machined
- Chrome Stems and Hard Tips
- O.E. Style Radius Keeper Grooves
Ships directly from supplier
This item ships directly from the manufacturer. If your order is urgent, please reach out to determine the specific lead time.
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This product has multiple variants. The options may be chosen on the product page
Description
Exhaust Valves
Questions & Answers (6)
Customer questions & answers
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Are these solid stem inconel valves?
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A I believe so but you may contact the manufacturer for clarification
would these be a good alternative for a twin turbo setup for a LT1? gonna be pushing that 800hp line don’t wanna risk it (normally do 40-160 roll races)
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Q would these be a good alternative for a twin turbo setup for a LT1? gonna be pushing that 800hp l...... Read more answer nowAsked by on July 23, 2025 2:27 amA Yes they would be a good choice for your application
Does this come with the intake valves and the exhaust valves for the LT1 or just the exhaust valves?
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Q Does this come with the intake valves and the exhaust valves for the LT1 or just the exhaust valves? answer nowAsked by on April 23, 2025 3:03 pmA Just exhaust valves
This fits on stock lt4 heads? Should I change intake valves too, since I'm going nitrous, I already have Magnuson 2650+ 150shot should be around 1150-1200whp
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Q This fits on stock lt4 heads? Should I change intake valves too, since I'm going nitrous, I alrea...... Read more answer nowAsked by on June 16, 2022 4:49 pmA Yes fits lt4 heads and I'd keep your factory lt4 intake valves
Will These Work On Ported LT4 Heads With Magnuson 2650?
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Q Will These Work On Ported LT4 Heads With Magnuson 2650? answer nowAsked by on March 11, 2022 9:07 pmA Yes they will
I’m looking for some good valves for my gpi ported lt1 heads
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Q I’m looking for some good valves for my gpi ported lt1 heads answer nowAsked by on December 29, 2021 4:32 pmA Email support@gwatneyperformance.com so we can better assist you in your selection for your application
Buy all your six GEN Camaro parts from GPI. These guys are the best.
Exactly what I needed