Valve Keys And Brake Bias Valve

[Norph]

Hello everyone,

I've got a 78 Cavalier GLS coupe. It's got the 1.9s CiH

I need a bias valve as mine in knackered

Also (and this is the biggy) I need about 5 or 6 valve keys/locks/collets. (porting the head at the moment and said number have grown legs and run off...)

Any help (especially on the collets front) would be massively appreciated!

I'm in the London area (East if that helps/clarifies...)

many thanks,

A