So I am about ready to go oversize with my ported 240 cyl. Pretty good rattle in it. I will probably send it to Denny as he did my head to run on race fuel. Have a +3 crank in the box rdy to go. Vast improvement or not? I can redo the port timing to the longer stroke. I am running a 34 PK and CPI big bore pipe. Exist crank is in good shape just trying to decide if it is worth the effort!!