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We measured Redblock cam valve events; here's what we got.

I have some AQ145A parts here that I just picked up, and the cover that goes over the air filter says .25mm-.45mm cold for the valves, or .010"-.018", and that's with an H cam that begins ramping off of the base circle at more than 360°.
 
OVERDRIVE said:
I have some AQ145A parts here that I just picked up, and the cover that goes over the air filter says .25mm-.45mm cold for the valves, or .010"-.018", and that's with an H cam that begins ramping off of the base circle at more than 360°.
Click to expand...
For gits and shiggles I looked up the clearances for an aircooled vw race, performance cams, Baja cams, etc… 0.006” in and out. If using lash caps and chromoly pushrods they recommend zero lash when cold (this is surprisingly common with flat tappet push rods and some direct acting rockers) and when warm you get the proper clearance. It’s also easy to set as you don’t need feeler gauges.
 
culberro said:
For gits and shiggles I looked up the clearances for an aircooled vw race, performance cams, Baja cams, etc… 0.006” in and out. If using lash caps and chromoly pushrods they recommend zero lash when cold (this is surprisingly common with flat tappet push rods and some direct acting rockers) and when warm you get the proper clearance. It’s also easy to set as you don’t need feeler gauges.
Click to expand...
VW engines expand a lot though, which is why the tiny 8mm head studs only get something like 21ft/lbs. The cylinders will expand more than the push rods. .006" is the spec most people follow, but there's some original documentation that shows .004" recommended. It's a different engine but still good to consider.
 
How about mechanical cams in a small Chevy? You're talking 0.030" at the valve, so 0.020" at the cam/lifter interface? This is some old school grinding though, nothing modern is like this. I kinda thought that maybe Volvo was thinking "Well, if they never adjust the valves, and they start to sink a little, there's margin for error with a big lash to start with". I don't know.
 
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