Y-guys      While ya'll are thinking about the "rocker" area what about

          making an optional "stand" to use a larger(dia) shaft so that

          a roller rocker from a different engine family might work. With

          the problems, with other  rockers,  this could remedy both problems.

               I'm far from an engineer, and I realize the geometry etc. would

          have to be worked out.........

                                                Bill

Bill

Pelham,Al

Bill, by spreading the rocker bolts from 1.200" apart to 1.450" apart it opens up a lot of options for future ideas. For now, I just want to make the heads available for use with stock shafts and existing rocker arms. There will have to be a number of sets of heads in use before it is worth while for one of the rocker manufacturers to make something special for them.

With the OE design you can only increase rocker ratio by moving the pushrod ball closer to the shaft. With the bolts 1.45" apart you can move the shaft up to .100" farther from the valve and make that side of rocker longer, increasing the ratio. By moving the pushrod ball .040" closer to the rocker and making the valve side .100" longer the ratio becomes 1.73:1

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

71% of original size (was 707x19) - Click to enlarge

Are FE or Chrysler rocker arms close enough to work with the revised shaft position?


Lawrenceville, GA

I'm a newcomer to the forum but have been watching the progress with the alloy heads for a while.

My two cents worth on the Rocker hold down bolts is that if you went to a larger diameter hole, the hole could incorporate a thread insert and still use 5/16 bolts. This would allow the use of standard covers and bolts and increase the strenght of the assebly.

I don't do enough engineering work to be able to quote hole and tap sizes or inserts. Nor do I know what John has in his machine for tools and bits.

Warren Adams

71% of original size (was 707x19) - Click to enlarge Grizzly (Aussie Mainline)