Background: 56 TBird with 312 YBlock, ported ECZC heads, EZC 9425 intake, mild cam (275/.423"), dual-point Mallory YH distributor with dwell at 31, stock exhaust, timed at 18 BTDC. Has a BG Speed Demon 575 cfm carb that I'm very happy with.

My question: the old Ford book says valve lash for both intake and exhaust should be set at .019". (I'm running regular stock valves). Does that figure still hold? What is your experience.

Thanks very much,

Joe