340 xhead spring shimming, height and pocket question(s)
A while back I asked the question about single valve springs for a 510 lift, I got lots of suggestions. Including the 942, I did all the math it should work I figured. When I talked to comp they told me they weren’t going to. I called three times and finally got a guy to explain that the spring rate wasn’t good enough for the lift plus the duration. I had to get the 995s. As far as machining there’s not to much. Take the valve guides down a little, and cut them for different seals. Summit sold me the tool to do that along with the seals and the install tool.
A while back I asked the question about single valve springs for a 510 lift, I got lots of suggestions. Including the 942, I did all the math it should work I figured. When I talked to comp they told me they weren’t going to. I called three times and finally got a guy to explain that the spring rate wasn’t good enough for the lift plus the duration. I had to get the 995s. As far as machining there’s not to much. Take the valve guides down a little, and cut them for different seals. Summit sold me the tool to do that along with the seals and the install tool.
