Valves by JMB Services

To fit DB4, DB5, DB6 & DBS Aston Martins


JMB custom valves for Aston Martins are made to our own unique specifications. They are machined from 214N stainless steel and then have a special process called Plasma Nitriding. This ensures good anti-friction properties & reduces wear in the area of the valve guide. The valves have Stellite seats to resist the corrosive effects of hot exhaust gases from the engine. The valves are also slightly modified in length for efficiency by promoting a superior fuel & air mixture flow.

We also stock custom DB4, DB5, DB6 & DBS tappet conversion valves. These have the same characteristics as our modified valves but are also made slightly shorter to allow for a V8 type tappet shim to be fitted. These need to be used in conjunction with our shorter valve guides as the valve cotters will now be in a different position and may run too close to the valve guide. A swan neck type valve spring retainer is also used which puts the spring length back to its original specifications.

We also stock custom V8 580 type valves which are also made the same way as the DB4, DB5, DB6 & DBS with the same efficiency modifications.