Prop sizing

[polker8]

Hello am just looking for some info as to which prop size to go for?. The boat is a 21ft avenger with a 250hp V8 running through a Volvo leg. The prop that was on this does not look right as it is really small but has no markings on it to help with its size. Any help would be appreciated

[adykitcher]

your better off speaking to a company like www.steeldevelopments.net

they will need more info than it looks small though, like top rpm, gear ratio etc!