No with a .020 deck + .027 is .047 quench,

.020 deck + .039 is .059 quench.

These arent my rules but KB,s After .060 quench, the benifits drop off fast. KB uses the word forfeited after .060

So .060 would be the max .050 would be better and .040 better yet. After that things get way to close for the average home builder. Every piston deck height to head clearence should be checked.

Like Cab eluded to earlier, stock deck heights are not consistant from front to back and side to side. Im sure yours arent either, so that .020 deck may be .027 in some cyl,s. Because of that some builders would suggest you go no tighter then .045 to .050. I havent heard of any 440 block going tighter then .033 without contact Aluminum rods need greater clearences. mike