I guess you could fit one of these in each head. or you could fit a Victa powertorque decomp valve in each head but with the Enfield type you can close the valves once the motor is spinning freely
https://www.ebay.co.uk/itm/Brand-Ne...sembly-/401454401626?hash=item5d788c085a

Last edited by NormK; 08/12/17 09:54 PM.