i am just rebuliting my cossy i am lookin to get about 400bhp out of it and i am just woundering what comp ratio to use if any one could help i would be greatful cheers danny oh i have had alook on the web and 7.2:1 seems about right would this be ok

 

standard compression would be OK for 400 brake

no need to go to 7.2:1 unless you are building the engine with the intention of running higher power at a later date