Re: Quench- how much is too much
A lot of people with pretty mild motors are extremely concerned about it. My 355 has a "bad" quench of .056" and it ran fine on 91 octane. And that is with 11:1 compression with 215-230 psi cold cylinder pressure.
Other factors than just quench influence a motor's tendency to detonate on pump gas. If you haven't purchased the parts or had the machine work done it wouldn't hurt to try to get the quench to .040". If you already have the parts don't worry about it.
'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter