Superado

iTrader: (34)

Is anyone running something different than an "H"?

H - High-Performance
HD - High-Performance bearing with dowel hole
HK - High-Performance bearing with moly/graphite coating
P - Standard Clevite 77 tri-metal bearing
N - High-Performance Narrowed for greater crankshaft fillet clearance
HG - High-Performance full angular grooved bearing
V - High-Performance with Lead Indium overlay (On Main Sets this indicates partial groove also)
VG - High-Performance with Lead Indium full angular grooved bearing
D - Bearing has a dowel hole
K - Tri-Armor coated bearing
X - Bearing has .001 more oil clearance than standard
XX - Bearing has .002 more oil clearance than standard
A or AL - Indicates Aluminum bearing material

and of course there are combinations of suffixes as well...
HN...HNK...HNDK...HXN...HXNK

Superado

iTrader: (34)

was just informed by a local vendor that "H" suffix rod bearings were discontinued and replaced by "HN" due to the "H" not working well with stock crankshafts
so they replaced them with the "HN" that will work well with both stock and aftermarket crankshafts...
makes sense, but I thought everyone here ran "H" rod bearings on stock cranks
The mains are still available in "H"

Vetal

iTrader: (3)

My bearings in addition to CB663H STD LOWER/UPPER also have 9*05 and 11*05 markings on them, what do they mean?
Also before "CLEVITE 77" there are letters N, H or P - do they mean anything?

Treyvs

Was the vendor talking about stock GM rods, or aftermarket rods?

ckpitt55

iTrader: (4)

there is no problem running H bearings on stock cranks. the H's are already chamfered to accommodate the larger journal radii that usually appear on aftermarket forged cranks. with a stock crank, that fillet is much smaller so there should be no clearance issues. as with anything bearing you run - pay attention to your main and rod bore shapes, journal roundess, and oil clearances.