I have a 21hp Intek v-twin 407777. I want to build it to have some reasonable horsepower. I'm actually a small engine mechanic at an industrial mower, fork truck, generators and many other things. I've never done a performance build though. So far I have the motor tore down, removed the governor. I got a complete gasket and bolt set and 2 new coils. From reading on here I believe you guys are saying mill .085 off the heads. I know I need valve springs but I am not sure if I've found the right ones or not.
https://eccarburetors.com/estore/260-ec-valve-spring-set.html?category_id=276 these are the ones I think I need. I need to know which keepers and locks I need to go with them. I know which rods and flywheel I need. I can't seem to find a cam, I don't think they are making them for the Intek 40's someone please help me there. Maybe any other suggestions anyone may have? It's just a personal project so no sanctioning bodies I have to abide by.. Sorry for the long post. I have been reading other's posts but most Intek stuff is old news. Thanks in advance, Tommy. One more thing. If any parts that will help me that I can get from briggs, I get them at cost.