Triumph “Cast Iron Head” Pre-Unit Twins Valve Spring Set (1) – 99-3700

We are now stocking a new Hepolite valve spring kit for early Triumph pre-unit twins that feature a “cast iron head”. This is a new quality spring kit ready to be installed…

Fits Triumph 350 & 500 Pre-Unit Twins from 1952-1956. Also fits Triumph 650 Pre-Unit Twins (Thunderbird, 6T, Bonneville, T120, Tiger, TR6 & T110) from 1952-1956. Please refer to your parts catalog for proper fitment.

Please note that our valve springs are sold in a set as pictured



**Features**

• Made by Hepolite
• OEM part numbers are 99-3700, 70-1487, 70-1488, E1487, E1488 & VS510