BB chevy crank question

greg fulk · 03-12-2011, 06:51 PM

I have an engine out of a 1993 3500 (454) it has spun #1 rod....how far under can a BB crank be turned? I was looking @ bearings & saw 10 tru 60 under?

Billy Nees · 03-12-2011, 06:53 PM

As long as it didn't get too hot, I'd have no problem whatsoever going .030.

BillK · 03-12-2011, 09:45 PM

Greg,
They make bearings to at least .040, maybe even .050. Guys turn them to small block size and race them with no issues so dont worry about grinding it that much. Just make sure it magnafluxes ok.

Wade_Owens · 03-12-2011, 11:45 PM

Greg, I have a 283 crank that was .050 mains, .060 rods. I ran it this way for a full season. It wasnt any faster than the others, but, lived just fine. Another failed experiment.........

Wade O

Alan Roehrich · 03-12-2011, 11:53 PM

The cast cranks are bad about cracking when they've been spun badly enough to need to go past 0.030" from standard size, if the rod throw has any real color in it, you're probably better off to find another crank. And check to make sure someone has 0.050" or 0.060" bearings in stock (make them go lay their hands on them) before you pay to have the crank ground that far. Those are not as easy to find as they once were, I'd hate to see you spend $150 or more grinding the crank and then not get the bearings.

greg fulk · 03-13-2011, 12:52 AM

ya know the thing dosen't look as though it got hot.....But I put a mic on it & it was .020 smaller then #2 needless to say the bearing was paper thin!

Rich Biebel · 03-13-2011, 09:01 AM

I have a fully done cast early 454 crank sitting in a box. Magged-shotpeeded- ground 010-010 and bagged.....

It has been sitting under a bench for years.....no one wants a cast crank and I have had it at a few flea markets with a cheap price on it...no takers....

I don't even recall why I have it!

greg fulk · 03-13-2011, 05:06 PM

Well the guy who's engine it is has decided to just buy a long block from Autozoo so dad & I put it back together today. ya know they go back together pretty quick when their's no rings on the pistons & you don't torque anything.

03-12-2011, 09:45 PM	#3
BillK Member Join Date: Nov 2005 Location: Waldorf Md Posts: 230 Likes: 12 Liked 30 Times in 17 Posts	Re: BB chevy crank question Greg, They make bearings to at least .040, maybe even .050. Guys turn them to small block size and race them with no issues so dont worry about grinding it that much. Just make sure it magnafluxes ok. __________________ Bill Koustenis

03-12-2011, 11:45 PM	#4
Wade_Owens Senior Member Join Date: Jul 2007 Posts: 578 Likes: 0 Liked 3 Times in 1 Post	Re: BB chevy crank question Greg, I have a 283 crank that was .050 mains, .060 rods. I ran it this way for a full season. It wasnt any faster than the others, but, lived just fine. Another failed experiment......... Wade O

03-12-2011, 11:53 PM	#5
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,124 Likes: 1,581 Liked 1,876 Times in 422 Posts	Re: BB chevy crank question The cast cranks are bad about cracking when they've been spun badly enough to need to go past 0.030" from standard size, if the rod throw has any real color in it, you're probably better off to find another crank. And check to make sure someone has 0.050" or 0.060" bearings in stock (make them go lay their hands on them) before you pay to have the crank ground that far. Those are not as easy to find as they once were, I'd hate to see you spend $150 or more grinding the crank and then not get the bearings. __________________ Alan Roehrich 212A G/S

03-13-2011, 12:52 AM	#6
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: BB chevy crank question ya know the thing dosen't look as though it got hot.....But I put a mic on it & it was .020 smaller then #2 needless to say the bearing was paper thin! __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"

03-13-2011, 09:01 AM	#7
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,315 Likes: 25 Liked 544 Times in 213 Posts	Re: BB chevy crank question I have a fully done cast early 454 crank sitting in a box. Magged-shotpeeded- ground 010-010 and bagged..... It has been sitting under a bench for years.....no one wants a cast crank and I have had it at a few flea markets with a cheap price on it...no takers.... I don't even recall why I have it! __________________ Rich Biebel S/C 1479 Stock 147R

03-12-2011, 06:51 PM	#1
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	BB chevy crank question I have an engine out of a 1993 3500 (454) it has spun #1 rod....how far under can a BB crank be turned? I was looking @ bearings & saw 10 tru 60 under? __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"

03-12-2011, 06:53 PM	#2
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,504 Likes: 3,606 Liked 7,814 Times in 1,748 Posts	Re: BB chevy crank question As long as it didn't get too hot, I'd have no problem whatsoever going .030. __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K

03-13-2011, 05:06 PM	#8
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: BB chevy crank question Well the guy who's engine it is has decided to just buy a long block from Autozoo so dad & I put it back together today. ya know they go back together pretty quick when their's no rings on the pistons & you don't torque anything. __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"