I'll be running the follwoing spec Engine and wonder if anyone can advise which would be a good Dump Valve to use - GGR, Bailey etc.

RS500 Block Long Studded
Polished Head
14 Inlet Cam - 10 Exhuast Cam (Mountune Spec)
GRP A Pistons
H-Beam Steel Rods
Balanced Crank
T34 .63
Siemen 55lb
-31 Actuator
Coil Pack etc on M.D. Chipped P8

Many thanks