Ok gear heads I know it's not a marine engine but it shows the R and D we do with the parts we use in our racing and poker run engines here are some pics of the 55mm cam bearings we've used for years in the racing engines and the oval port big chief heads we're currently using in our MB800na which is 800 hp naturaly aspirated single 4 bbl carb pump gas engines and the combustion chamber desighn were currantly using which enables us to make that power on pump gas . Hope you guys enjoy . P.S. were spraying three stages of 200hp for a total of 600 hp on spray alone .