Originally Posted by THE DOCTOR
I have the JP EFRA pipe not sure of the number. I checked the top of the piston and it looks good. I put the extra shim in just to be safe.
We have a big flowing track. What is the better length pipe short or long?
The JP Pipe is fine get a pair of manifolds (short and medium) and see what suits better to the engine.
Regarding adding shims. I use it with a 25% Nitro and needed to add 0.2mm of shims to get the correct combustion chamber, maybe and depending you run and the fuel you use with only one shim, you're going short on chamber height (seemed to read here that guys going to 30% Nitro added 0.3mm.