Thanks Erik and techinspector. I wasn't planning on running it up to 6500. It was just a limit of how high I would be willing to go if someone suggested a more radical cam. Too many pieces that I wouldn't trust over that.

The 10.8:1 wasn't on purpose. Missed on this when I was putting the thing down on paper. I used SpeedPro's spec showing 9.97:1 for 58cc heads when I went with it. Didn't take decking into consideration. Dumb! Dumb! I think I'm correct on the 10.8:1 using 5cc for pistons, .039 gasket, and 0 deck clearance. I would rather it was down at 10:1, but I'll run whatever I have to run in it to make it work. It's not ever going to be a daily driver, just a toy.

On Comp Cams dyno test with this cam, they show 17 in. at 1000, so I'm not extremely worried about vacuum. If I pull that much, I may try 1.6 rockers on the exhaust (I have sufficient spring clearance to run the .515 lift that would give) and I will be checking valve-piston clearance before I bolt it up.

I have rebuilt a number of rice burners and 4 and 6 cyl engines over the last 35 years, so I'm not quite new to this stuff, just busy trying to catch up on what's happened over those years in the world of performance. The last built engine I put together was a 331 Chrysler (went in a 53 Stude. Never was able to pry the shoehorn out. If you ever want to see exhaust problems, try that mix. Exhaust ports line up perfectly with the steering column.), and most before that were 3/8"X3/8* flatheads. It has been a long time. ;>)

This forum has been an incredible resource to me and I have used the search function innumerable times to gather info. I hope you all realize what a valuable source of information you are. Thank you for being here.