BB Olds bearings

Marvin Robinson · 03-14-2011, 01:16 AM

Is anyone aware of availability of a .050 under bearing for the 455 Olds rods?? If not, is there a suitable undersize that I can grind my crank to and use a different bearing??? Thanks.

Alan Roehrich · 03-14-2011, 11:24 AM

Marvin, what are you trying to do? Repair a bad journal?

Marvin Robinson · 03-14-2011, 04:43 PM

You got it, #5 rod took the journal down .004 when it spun, and the crank is already .040 under (.013 offset). I'm getting a lot of negatives trying to get the crank welded..... if I have to replace it, can I use the Eagle cast crank in stock??

Alan Roehrich · 03-14-2011, 06:46 PM

Nope. Aftermarket crankshafts are not legal in Stock. I know Olds cranks are getting hard to find. At least good ones are. So are blocks.

Daran Summerton · 03-14-2011, 07:32 PM

Do you really need .013 on a 455 Olds??? HAHA If it were SS you could offset grind a 425 crank and use 454 bearings.

Marvin Robinson · 03-14-2011, 07:36 PM

Quote:

Originally Posted by Daran Summerton

Do you really need .013 on a 455 Olds??? HAHA If it were SS you could offset grind a 425 crank and use 454 bearings.

I don't see any real advantage to offsetting by .013, but that's the way the motor was when I bought the car. If the crank needs to be turned .010 or .020 under, might as well get the minuscule stroke advantage, too. (Note: in the Olds, most stock blocks have the pistons about .030 down in the hole, the offset will reduce the amount you have to deck the block)

Jim Kaekel · 03-15-2011, 08:04 AM

Marvin: When the crank is stroked .013", it is also "indexed" as well, insuring that the rod throws are truly 90° apart. It shouldn't be too hard finding a suitable replacement crank, I'm not hoarding all of them.

Marvin Robinson · 03-15-2011, 11:08 AM

Quote:

Originally Posted by Jim Kaekel

Marvin: When the crank is stroked .013", it is also "indexed" as well, insuring that the rod throws are truly 90° apart. It shouldn't be too hard finding a suitable replacement crank, I'm not hoarding all of them.

Good point, thanx for the info, Jim. I think I've got a line on a couple spares (I want to build a spare short block, too. Shure would be nice to just be able to buy an Eagle cast crank.

03-14-2011, 01:16 AM	#1
Marvin Robinson Member Join Date: Jun 2005 Location: Gary, IN Posts: 139 Likes: 0 Liked 0 Times in 0 Posts	BB Olds bearings Is anyone aware of availability of a .050 under bearing for the 455 Olds rods?? If not, is there a suitable undersize that I can grind my crank to and use a different bearing??? Thanks. __________________ Marvin Robinson 3188 STK/SS

03-14-2011, 11:24 AM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,123 Likes: 1,581 Liked 1,874 Times in 422 Posts	Re: BB Olds bearings Marvin, what are you trying to do? Repair a bad journal? __________________ Alan Roehrich 212A G/S

03-14-2011, 04:43 PM	#3
Marvin Robinson Member Join Date: Jun 2005 Location: Gary, IN Posts: 139 Likes: 0 Liked 0 Times in 0 Posts	Re: BB Olds bearings You got it, #5 rod took the journal down .004 when it spun, and the crank is already .040 under (.013 offset). I'm getting a lot of negatives trying to get the crank welded..... if I have to replace it, can I use the Eagle cast crank in stock?? __________________ Marvin Robinson 3188 STK/SS

03-14-2011, 06:46 PM	#4
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,123 Likes: 1,581 Liked 1,874 Times in 422 Posts	Re: BB Olds bearings Nope. Aftermarket crankshafts are not legal in Stock. I know Olds cranks are getting hard to find. At least good ones are. So are blocks. __________________ Alan Roehrich 212A G/S

03-15-2011, 08:04 AM	#7
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,229 Likes: 133 Liked 535 Times in 110 Posts	Re: BB Olds bearings Marvin: When the crank is stroked .013", it is also "indexed" as well, insuring that the rod throws are truly 90° apart. It shouldn't be too hard finding a suitable replacement crank, I'm not hoarding all of them. __________________ Jim Kaekel 3836 STK

03-14-2011, 07:32 PM	#5
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: BB Olds bearings Do you really need .013 on a 455 Olds??? HAHA If it were SS you could offset grind a 425 crank and use 454 bearings. __________________ 72 cutlass