Quote:
Originally Posted by Mark Yacavone
Yes, but I don't think you need .006. A lot of older motorcycle exhausts were around .003. Somebody try and let us know ....
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Mark, this has been done for decades on high perf street engines.
You can be down around .002 (hot) with a solid lifter on a 'hydraulic' cam lobe. Basically, as close to '0' as you can without hanging the valves open. A good rule of thumb.... on a typical iron head/iron block setup, you need around .003 more lash 'cold' than what you want it at 'hot' to allow for expansion. ie: .006 cold will get you .003 hot.
Iron block/alum. heads & alum. block/alum. heads expand differently than iron block/iron head, of course.