Small Valve AL Heads

@nm9stheham , the 920 chambers are 3.836 at the widest point. The valve center was 1.869 or close to it. The 920's are slightly larger than the 273 3.63 bore and slightly smaller than the 318's 3.91 bore. It looks like a +.030 273 would be perfect. My 273 is right there.