I've been down this road that you're on about a year ago. No one, repeat, NO ONE, makes a hydraulic roller cam for an inline six cylinder motor. If I were in your shoes and wanted to make that kind of HP from a 153, I'd think real seriously about putting a turbo on it instead of tweaking everything to the absolute limits of reliability. With the figures you're talking about, a normally aspirated engine is going to be right on the ragged edge of self destruction, even with all heavy duty components in it.
This is just my opinion, so feel free to take it with however many grains of salt you prefer. Whichever way you go with it, it sounds like a really interesting project.
Oh, yeah, and welcome to the Bulletin Board.
Last edited by Wagoneer; 05/28/16 12:43 AM.
