Outer Diameter – Outer Valve Spring: 1.260 IN
Inner Diameter – Outer Valve Spring: 0.860 IN
Inner Diameter – Inner Valve Spring: 0.770 IN
Installed Height: 1.750 IN
Installed Load / Height (Valve Closed): 140 LB @ 1.750 IN
Open Height: 1.200 IN
Open Load: 437 PS
Open Load / Height (Valve Open): 437 LB @ 1.200 IN
Valve Spring Rate: 540 PS
Max Coil Bind: 1.115 IN
Max Valve Lift: 0.550 IN
Recommended Valve Spring Retainer – 300 Series: R349
Recommended Valve Spring Retainer – 600 Series: R649
Valve Spring Series: 1200 Series
Valve Spring Type: Single with Damper
Valve Spring Application: Circle Track
Primary Market: Circle Track|Street Performance
/eh/2025-01-08/173633966714069467/picture.png)
/eh/2025-07-08/1751962110204480194/picture.png)
/eh/2025-06-21/1750485741321434291/Hi-Sign-in-My-Nihao.png)
/eh/2025-06-21/1750485837193896318/cart.png)
/eh/2025-06-21/1750485968202533847/cart.png)
/eh/2025-04-17/1744862476612819675/hot-img.png)









![Lurantis GX (150/149) [Sun & Moon: Base Set]](https://cdn.shopify.com/s/files/1/0275/9661/9858/products/012268a3-a378-4b81-8067-ed0216dbae88_9bd38947-b5a0-4091-90e6-8688a398f6df.png?v=1696311806)
![Noivern GX (141/147) [Sun & Moon: Burning Shadows]](https://cdn.shopify.com/s/files/1/0275/9661/9858/products/d6ab762a-bf1e-46b4-ae20-d6442172897a_7d86e728-64f5-4a4f-8e42-83cdc49cb6b1.png?v=1696312314)
![Ultra Ball (161/149) [Sun & Moon: Base Set]](https://cdn.shopify.com/s/files/1/0275/9661/9858/products/1ab36946-a2c5-4b1c-87ad-7e9f46b3f76b_4640586d-5036-4570-b440-9f78dc2688f0.png?v=1696311565)