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I think that is a Nissan factory grade number for ultra close tolerances when Nissan is assembling a new engine on the assembly line. I think the grades are based on ten thousandths of an inch. It isn't anything we need to be concerned with.
On later engines they have similar grade numbers on main bearing journals and rod journals as well, but they are really splitting hairs with these fine grades.
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'93 SE-R
'89 B12 4WD GA16DET
'86 B11 Euro-Rallycross car
'81 Datsun 210
'77 Datsun B210 hypermiler [77.04 mpg!]
Last edited by blownb310 : Mar 24th, 2008 at 09:59 AM.
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