Let me ask a question. And I mean absolutely no disrespect here. After all, I have personally concocted some of the most hair-brained, fire-breathing and non-streetable motorcycle modifications in hillbilly history.
If you want hot cams in a Bobber, wouldn't it be wise to consider just buying the factory Thruxton-R cams? I mean, what reputable company is going to invest any real R&D time in developing cams for a bike they'll be lucky to ever sell 40 sets of cams for? Where's the profit in that? Do you really think Tec or some other small-potatoes company is going to do anything more than add a little lift and duration based on an educated guess and ship it? Are these amateur-designed cams going to function well in the long run with your factory valve springs and rockers? Who's going to do the testing to determine that? YOU are, that's who. And for what? I mean, how much more horsepower than a Thruxton-R are you really going to be able to squeeze out of your Bobber motor without adversely affecting durability and/or how smooth the power curve is? How much low end torque are you going to lose? And if the surface finish on the bearing journals isn't smooth enough, or the cams aren't properly toleranced or heat-treated and they ruin your head in a year or two, do you think Billy-Bob Inc. is going to buy you a new head?
Learn from my foolishness and misguided horsepower lust. I was the guinea pig on a professionally installed Wiseco forged big-bore kit that barely lasted thru break-in and they quit making rings for it a year later anyway, so I had to throw my cylinder bank in the scrap barrel and start over. I once bought eight Moriwaki valves for my Kawasaki that cost more than 16 Manley valves for a 427 Chevy Rat motor. I paid Jerry Branch, arguably the best motorcycle head man who ever lived (and formerly Elvis Presley's personal bike mechanic), to install them, and port and flow the head. When Jerry got them he called me and asked, "Who the h*ll designed these valves, some retard?" There was literally no way to fit them into the head for which they were supposedly designed without physical interference (both with each other, and with the pistons!). I returned the valves to Moriwaki and they refused to refund my money or make valves that fit. Old man Moriwaki said Jerry was not qualified to evaluate their valve design. ("He nah kwawifi to say").
PS: Trirocket-3, I absolutely LOVE your crazy sh!t so please totally disregard this and keep posting about your experiments. If your Bobber motor explodes between your knees, start a GoFundMe and I will chip-in.
Last edited by GPz; 06-04-2019 at 09:25 PM.