transom rebuild help

[Richie Rich]

Is the old tank the bigger poly tank and the new 30 is on the right? I never knew they came in poly from the factory...mine is aluminum......is there enough room for expansion? I think you need to expect about a 3-5% expansion of a poly tank...and you need to vent the compartment as well as the tanks actually breath and emit fumes....thats great the way you fit it in......this is gonna be a nice rebuild.