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geometry

  1. GN7 On the Dyno
    SF is mid lift 90* rocker pivot/ valve stem. This does not necessarily put rocker tip on the center of the valve. I was taught the center of tip, smallest pattern years ago. I see the validity of both methods. Discuss away. Wags
  2. V-Drives
    I'm redoing my plates. Currently have the old Hallcraft hexbar setup and will be installing a 1" control bar. How do I determine control arm length and turnbuckle angle? 19' Schiada,, blown/injected.
  3. GN7 On the Dyno
    Is the positon of the roller tip to the valve okay in this photo? My cam is at full lift in this photo.
  4. Propellers
    Hi I'm racing a GM-Holden powered 202ci 6cyl centre mount. My engine is should be making power well into the 6000's rpm it has 11.5:1 comp, [email protected] comp cam, and a holley 570 4bbl. I'm running an 11x12 cupped prop (3blade) and achieved my best speed of 56.5 gps/mph @5300rpm I tried reducing the...
  5. GN7 On the Dyno
    Have a set of 049 BBC iron heads, replaced valves with Manley severe duty valves, machine shop said he needed the longer valves to get seat pressure correct. Now all valve events are out the window, rocker riding on outside, exhaust side of valve. Have adjustable push rods for mock up, can...
  6. GN7 On the Dyno
    Examine the picture and you can see the issue. This is the "block true" plate that came with a SV85 I just came up with. I felt a need to check it for somee reason. As you can see it is not right. I indicated the slot. It is parallel to the Y axis on my mill. I then indicated center from the...
  7. GN7 On the Dyno
    Its been discussed here before and generally accepted the best way to set up rocker geometry is based off mid lift angles. So is there a lobe profile that takes full advantage of this ?
  8. GN7 On the Dyno
    I had a rocker arm fall off a pushrod last time out(not sure where that thread went). Had a few comments that my pushrods looked a lil short. I'm not sure...maybe...it would be nice if they were cause I have some rocker arm to stud issues. The rocker arm I thought I broke has a groove below the...
  9. GN7 On the Dyno
    i installed the t&d's according to the instructions & that did not work. the valve stems are too long. the heads have a raised port & that put the rocker on the outside edge of the valve. i had to (not shim) the assembly in order to get the rocker onto the center of the valve stem. this caused...
  10. GN7 On the Dyno
    As I'm pre-planning my next build, I'm really digging deep and trying to learn everything that I can in regards to proper valve train geometry. I'll be running a Comp Cams XM278H cam with Comp Cams Pro-Magnum hydraulic lifters. From everything that I've read, they say to use a solid lifter for...
  11. GN7 On the Dyno
    Should the rocker arm roll across the top of the valve stem or should it stay in the center of the valve stem and be as norrow as possible?.
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