LS Engine BUILDER help, King main bearings, 2 different numbers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**crossy** · 03-05-2021, 12:07 PM

OK, engine BUILDERS help me out. I am an old school engine builder, and had not touched an LS based engine to this point. My 6.0 shortblock, which is already done, has the King MB5293-SI bearings in it according to my receipt. The engine is a 6.0 Out of a 2005 heavy van, the engine was CAST in August of 2004 meaning it would be the right engine for a 2005 vehicle, BUT 2004- 2005 is separation years for what the recommended bearings are and I never trust anything that is in a changeover year. If I look up the 6.0 it says to use the King MB5013XP bearings. I downloaded right from the king site the specs on BOTH of those bearings and all that I am seeing different is the one set has a .002 max wall thickness. I just want to make sure that because those numbers I gavea re complete sets that the chamfer for crank radius or the thrust face hasn’t changed from one set to the next. The simplest change can bite you quick. The engine turns fine, but that’s just one piece of the puzzle. I also checked the crankshaft number and it is a ‘216’ crank, but I saw two versions of that! ALSO, should I check rod bearings, like were any differences there also?
BTW- I got my ‘be careful’ info of all the differences from an older ‘ENGINE BUILDER’magazine on-line.
thanx, Crossy

**hatzie** · 03-06-2021, 11:01 AM

Can you get any info from the old bearing shells?
Stamped GM part #s or by just plain measuring them?

03-05-2021, 12:07 PM	#1
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	LS Engine BUILDER help, King main bearings, 2 different numbers OK, engine BUILDERS help me out. I am an old school engine builder, and had not touched an LS based engine to this point. My 6.0 shortblock, which is already done, has the King MB5293-SI bearings in it according to my receipt. The engine is a 6.0 Out of a 2005 heavy van, the engine was CAST in August of 2004 meaning it would be the right engine for a 2005 vehicle, BUT 2004- 2005 is separation years for what the recommended bearings are and I never trust anything that is in a changeover year. If I look up the 6.0 it says to use the King MB5013XP bearings. I downloaded right from the king site the specs on BOTH of those bearings and all that I am seeing different is the one set has a .002 max wall thickness. I just want to make sure that because those numbers I gavea re complete sets that the chamfer for crank radius or the thrust face hasn’t changed from one set to the next. The simplest change can bite you quick. The engine turns fine, but that’s just one piece of the puzzle. I also checked the crankshaft number and it is a ‘216’ crank, but I saw two versions of that! ALSO, should I check rod bearings, like were any differences there also? BTW- I got my ‘be careful’ info of all the differences from an older ‘ENGINE BUILDER’magazine on-line. thanx, Crossy __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

03-06-2021, 11:01 AM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: LS Engine BUILDER help, King main bearings, 2 different numbers Can you get any info from the old bearing shells? Stamped GM part #s or by just plain measuring them? __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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