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340 crank #679682 04/25/10 08:23 AM 04/25/10 08:23 AM
Joined: Sep 2007 Posts: 58 laurens,south carolina M mopar_rr OP member
mopar_rr OP member M Joined: Sep 2007 Posts: 58 laurens,south carolina	Hi i would like all feed back on if you have had a steel crank turned .030 under...I have one that will have to be turned and was wondering any mopars owners have had this done,and if any kind of problems??this only going to be driven on street.thank you randy HAVE A NICE MOPARIN DAY....

Re: 340 crank [Re: mopar_rr] #679683 04/25/10 08:49 AM 04/25/10 08:49 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	I wouldn't worry about it. Mopar shafts are not noted for breakage. even with a .030 cut they are a pretty stout piece.

Re: 340 crank [Re: MoparforLife] #679684 04/26/10 02:54 AM 04/26/10 02:54 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	How about THIS: I had mine turned .040 under ! Bearings are available up to .050, so what the heck, roll with it.

Re: 340 crank [Re: Kern Dog] #679685 04/26/10 11:26 AM 04/26/10 11:26 AM
Joined: Jan 2003 Posts: 3,505 DFW M mr_340 master
mr_340 master M Joined: Jan 2003 Posts: 3,505 DFW	Funny how people will turn a crank down to Shivy rod bearing sizes, yet others freak out with a .030" cut. I have a fresh 340 ready to go with .030" under rod journals. I'm only going to use it for IHRA Pure Stock racing and I'm not worried about it in the least. Floyd Lippencott IV

Re: 340 crank [Re: mr_340] #679686 04/26/10 11:44 AM 04/26/10 11:44 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Quote: Funny how people will turn a crank down to Shivy rod bearing sizes, yet others freak out with a .030" cut. I have a fresh 340 ready to go with .030" under rod journals. I'm only going to use it for IHRA Pure Stock racing and I'm not worried about it in the least. Ain't that the truth? I always get a kick of that too. Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!

Re: 340 crank [Re: MoparforLife] #679687 04/26/10 11:57 PM 04/26/10 11:57 PM
Joined: Mar 2003 Posts: 18,679 Fresno, CA Jim_Lusk I Live Here
Jim_Lusk I Live Here Joined: Mar 2003 Posts: 18,679 Fresno, CA	A noted local engine builder (who likes Chevs) told me that Chrysler cranks will take the most cut and still be strong. The crank in my son's 383 is .030 under......

Re: 340 crank [Re: Jim_Lusk] #679688 04/27/10 08:29 AM 04/27/10 08:29 AM
Joined: Dec 2003 Posts: 974 Q qkRick super stock
qkRick super stock Q Joined: Dec 2003 Posts: 974	I'm NOT an expert so I rely on input from folks who are. Interesting theory and prctice of local racer. He starts with at least .020 under and goes up from there stating that it gives him "more" bearing. I don't know if true or not but he flogs his stuff and doesn't break.

Re: 340 crank [Re: qkRick] #679689 04/27/10 08:33 AM 04/27/10 08:33 AM
Joined: Mar 2003 Posts: 15,493 the boonies aarcuda I Live Here
aarcuda I Live Here Joined: Mar 2003 Posts: 15,493 the boonies	ive run em .040 under. no problems! It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.

Re: 340 crank [Re: mopar_rr] #679690 04/27/10 10:13 AM 04/27/10 10:13 AM
Joined: Apr 2005 Posts: 1,322 Michigan C crlush pro stock
crlush pro stock C Joined: Apr 2005 Posts: 1,322 Michigan	ive had mine ground .030, had a spun bearing, so had one journal welded and was ground .030, it was a crane racing crank, was done 15 yrs ago and still using it today with 150 shot of nitrous on my race/street car with no problems at all. I wouldnt sweat it, although when you grind .030 you are somewhat limited on bearing choices, but I dont think that it will be a problem for you since you are using it for street.

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