I never bore an engine more than needed to clean it up. This block was the bottom of my 20/22 hybrid til i dropped #4 exhaust valve at 7000 rpm 
it was a stock block but after that valve beat the hell out of that cylinder it had to go to .060 to clean it up.
to answer the question though yes you can bore it to .080 BUT pistons are about $400 a set. thats $100 per piston.
Hey 79coyotefrg,
That's a good point, although I didn't price the cost of larger pistons, I did think about boring the block.
Looking back, during my discussions with Tod at engbldr and my local machine shop, the idea of boring beyond what was necessary to clean up the block to gain more power was not discussed? I'm not sure why I didn't think about it more??
My thinking may be off, but I figure if everything goes according Hoyle *fingers crossed* I won't have to rebuild this engine. I will have over $4,000 in the rebuild, and my objective was to modify it for more torque. I didn't price the cost of pistons over the .020", but adding another $400 to gain more torque would be worth it to me.
My ultimate plan is to pull a little fiberglass 16' travel trailer, so I was going for all the extra power I could get, within my tight budget, to gain needed extra torque at freeway speeds.
Comments here by some folks suggest changing R&Ps to lower the gearing. I figure roughly that would be around a $600 investment for absolutely ZERO torque gain. For $400 more I could have several more pounds of torque. When I calculate cost per increase in torque, why would I spend $600 and gain nothing except lowering the peak torque in my RPM range?
Here's how I see it right now..... I only have Tod's expertise at engbldr, my DD data, speculation, assumptions, and comments from the guys who are running or have run a 261C cam in a 22, but some comments seem to indicate that while it gains peak torque in the lower to mid RPMs, it seems fall off in the upper RPM range, which is understandable. I estimate that 90% of my engine running time will be between 2600 and 3400 RPMs - THAT is the RPM range where I want my power.
If the 261C cam does not perform well enough, I will look at another cam profile, and possibly some other modifications. But when it comes time to pull a 16' travel trailer, and it just can't do it reasonably, I'll buy another Tundra.
Gnarls.
