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)







![Lenovo IdeaPad Pro 5 Productivity Laptop [16AKP10-83JN0018MJ]](https://cdn.shopify.com/s/files/1/0619/5013/2271/files/q_96ccebbb-d4f1-432b-9ab7-d97ff4e26421.png?v=1747639766)

![Mazer Infinite Travel PD70W Gan Universal Travel Charger [Black Grey/Titanium White]](https://cdn.shopify.com/s/files/1/0619/5013/2271/files/q_b35c69f7-5aab-415e-bb2e-81d1da33a9a8.png?v=1769596424)
![Corsair EX400U USB4 External SSD [1TB/2TB/4TB]](https://cdn.shopify.com/s/files/1/0619/5013/2271/files/q_ad416e21-e530-48a9-8c13-d854305a0399.png?v=1747298875)
