no way! that bottom setting would be way lean, and top way rich..

this is where i start with OS engines.

IDLE: 1-1/4
HSN: 2-1/4
LSN: 4
MRN: 3-1/4 (flush with chamfer)

by the time im done fine tuning i usually end up with something like this

IDLE: 1-1/8
HSN: 2-1/8
LSN: 3-1/2

p4 plug 2060/ 2042 30% nitro