318 piston's and quench

Valve reliefs are generally about 5ccper piston. This is not very significant on an open chamber 360 which might already have a total chamber volume of nearly 100cc and a swept volume of 750cc. However on a 273, with a swept of only 559 and a total chamber with the closed c heads of around 75ish, every cc counts. A 318 is in-between, with a swept of 651,and total chambers from 75 to 90ish; depending on head choices and deck heights.
-My personal engine is a 360 with a swept of 750cc,and a total chamber of 77.5cc, giving a c/r of 10.7:1. The pistons are .005 up, and the gasket is .039, so the quench with Eddies is .034. This is a great combo. I have run cams from 223* to 241*,all with very nice results.All accept full timing with 87 octane E-10. The little 223* cam was able to run fairly lean and on a 12 hour highway blast, I was able to tune into the 40mpgCan, which for southern friends is 36.The quench design works.
One thing I think I would do differently on the next engine is to not machine the decks., instead ordering the correct design, custom pistons.
-A little "secret";The more swept that you start with, the easier it is to make compression. It costs the same for all the machining.Sometimes more is less( costs less).Most of the parts cost the same between engine sizes. Hi-comp pistons for the smaller LAs are often more money than 360 flat tops.Cam selection is more forgiving on the larger bore motors.head selection is broader. You see where Im going, right?