Reed petal to housing clearance

[vince]

Gents with knowledge ::
I am in process of fitting a reed valve on a non reed engine and because of the reed I am using this involves building the reed housing from scratch.
The question I have what clearance do I have to leave between the reed petals and the housing the reed fits into to give clearance for the petals to open ?

[GLscoot]

Are you using a manifold and what type of reeds are you using.

[vince]

Building the block as it going straight in and fitting a V force reed assy.

[Darrell Taylor]

try buying a scrap cylinder for the reed your using (if cylinder reed) and cut the reed box off it then you have an oem design that has the benefit of the manufacturers r+d time which could be up to 10yrs worth in some instances

[fastfrog]

on my lth reed block I've at least 11 mm from free edge of the petal to inner housing.