Large valved 273

A 2.02 valve hits the stock 273 bore by something like .065" per direct checks. So if you want to clear the bore with no notch you gonna have to do things like:

• Offset the bore to take more off the intake side. Since this on a non-thrust side of the bore, you can take more out.
• Skim a bit off the outer edge of the valve. There is not a lot of margin to play with but there is a bit.
  
• Or, put a small notch near the upper edge. Once you get the valve head past the bore edge, the valve head angles more into the center of the bore and the clearance improves a bit.

And yes, I have been looking at all sorts of alternate pistons for this. There are some that are up around 3.700" diameter that will be useful so that the cylinder can be both overbored and offset bored. My 273 block will take it.... one bore will get a tad under the minimum wall thickness I wanted, but I'll live with it.