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early 360 (71-73) main bearing question? #758403 07/26/10 01:42 PM 07/26/10 01:42 PM
Joined: Mar 2010 Posts: 162 monticello,ms andy3965 OP member
andy3965 OP member Joined: Mar 2010 Posts: 162 monticello,ms	I have two of these blocks('72 and '73) and was wondering which main bearings everyone is using? the only ones i can find are 1/2 groove. i was hoping to use full groove.did a search and found where some folks said that you could use '74 and up bearings.has anyone done this? this is going to be for a 408 so i want to use the best available bearings. thanks, Andy MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!

Re: early 360 (71-73) main bearing question? [Re: andy3965] #758404 07/26/10 02:05 PM 07/26/10 02:05 PM
Joined: Nov 2004 Posts: 2,495 Oregon City, OR Baxter61 top fuel
Baxter61 top fuel Joined: Nov 2004 Posts: 2,495 Oregon City, OR	Im sure the experts will chime in but my understanding is the 74 up block uses a different thrust bearing. Never did a personal comparison though. Also, Clevite has bearings listed for the different blocks. Thinking this may be the reason.

Re: early 360 (71-73) main bearing question? [Re: Baxter61] #758405 07/26/10 09:33 PM 07/26/10 09:33 PM
Joined: Jan 2005 Posts: 1,163 Newark, OH Hunted Duck super stock
Hunted Duck super stock Joined: Jan 2005 Posts: 1,163 Newark, OH	I am running the 120M that are 3/4 grove. They are for the 71-73 blocks.

Re: early 360 (71-73) main bearing question? [Re: andy3965] #758406 07/26/10 11:35 PM 07/26/10 11:35 PM
Joined: Jul 2010 Posts: 11 Ball Ground, Georgia W Whips 340 member
Whips 340 member W Joined: Jul 2010 Posts: 11 Ball Ground, Georgia	You can try Calico coatings. They sell coated bearings for all types of apps. They may have a full grooved set for the 71". Phone; 866-483-2272 Whip

Re: early 360 (71-73) main bearing question? [Re: Whips 340] #758407 07/27/10 08:37 PM 07/27/10 08:37 PM
Joined: Mar 2010 Posts: 162 monticello,ms andy3965 OP member
andy3965 OP member Joined: Mar 2010 Posts: 162 monticello,ms	nobody else has wanted to run fullgroove bearings in the early 360 blocks?no one has ever used '74 and up bearings in older blocks?like i said i searched around on the internet and found some info that said you could use the later bearings,but some said you couldn't.i did find some 3/4 groove but was really hoping to use full groove.anybody??????????? MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!

Re: early 360 (71-73) main bearing question? [Re: andy3965] #758408 07/27/10 09:14 PM 07/27/10 09:14 PM
Joined: Mar 2007 Posts: 12,013 Finally a HUSKER again Moparnut426 I Live Here
Moparnut426 I Live Here Joined: Mar 2007 Posts: 12,013 Finally a HUSKER again	I honestly dont think there would be any issue, I have used a bearing set out of a magnum engine in a 75 360. Its just a beater truck, and I used what I had laying around. Its still running fine with o oiling issues. KAsey

Re: early 360 (71-73) main bearing question? [Re: andy3965] #758409 07/27/10 09:24 PM 07/27/10 09:24 PM
Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio dartman366 I Live Here
dartman366 I Live Here Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio	Quote: nobody else has wanted to run fullgroove bearings in the early 360 blocks?no one has ever used '74 and up bearings in older blocks?like i said i searched around on the internet and found some info that said you could use the later bearings,but some said you couldn't.i did find some 3/4 groove but was really hoping to use full groove.anybody??????????? Can't remember the part# but I just used two set's of mains to get the full grove set-up that I wanted, I have a 72 block and from what have heard the machining in the earlier block,s were supposed to be a smaller relief cut for the outer flange diameter of the thrust bearing and the later block's were machined bigger for a bigger bearing outer flange diameter, but some of the earlier block,s were machined for the bigger diameter,,,if I was told correctly. Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.

Re: early 360 (71-73) main bearing question? [Re: dartman366] #758410 07/27/10 10:04 PM 07/27/10 10:04 PM
Joined: Mar 2010 Posts: 162 monticello,ms andy3965 OP member
andy3965 OP member Joined: Mar 2010 Posts: 162 monticello,ms	yeah i thought about buying two sets but that would be over $100 easy. also thought about going ahead and getting the '74 and up full grooves, but if they didn't work then i would have to get two sets of the early bearings and be out that much more money!!! i was hoping that one of the smallblock experts would chime in and tell what they do on the early blocks.i may have to call ryanj and ask him. i sent him an email but haven't gotten a response yet.i'm sure he is real busy,so i thought i would ask here. i just need a deffinate answer (yes or no) about using the '74 and up bearings. MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!

Re: early 360 (71-73) main bearing question? [Re: andy3965] #758411 07/27/10 10:39 PM 07/27/10 10:39 PM
Joined: Nov 2004 Posts: 2,495 Oregon City, OR Baxter61 top fuel
Baxter61 top fuel Joined: Nov 2004 Posts: 2,495 Oregon City, OR	run the 3/4 groove, those will work fine.

Re: early 360 (71-73) main bearing question? [Re: Baxter61] #758412 07/27/10 10:55 PM 07/27/10 10:55 PM
Joined: Jan 2003 Posts: 4,616 Kissimmee Fl. D dusturbd340W5 master
dusturbd340W5 master D Joined: Jan 2003 Posts: 4,616 Kissimmee Fl.	I am not have any problems running 1/2 groove bearings I spin it 7200 just looked at all the bearings after 100 passes and they all still looked like new. 70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

Re: early 360 (71-73) main bearing question? [Re: dusturbd340W5] #758413 07/27/10 10:57 PM 07/27/10 10:57 PM
Joined: Jan 2003 Posts: 4,616 Kissimmee Fl. D dusturbd340W5 master
dusturbd340W5 master D Joined: Jan 2003 Posts: 4,616 Kissimmee Fl.	oh my machinist also showed me an artical from Clevite showing that a full groove bearing could not carry the same load as a half groove 70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

Re: early 360 (71-73) main bearing question? [Re: dusturbd340W5] #758414 07/28/10 06:43 AM 07/28/10 06:43 AM
Joined: Jul 2010 Posts: 2,091 Delray beach, Florida P Performance Only top fuel
Performance Only top fuel P Joined: Jul 2010 Posts: 2,091 Delray beach, Florida	Quote: oh my machinist also showed me an artical from Clevite showing that a full groove bearing could not carry the same load as a half groove that's absolutely true. however, i believe the benfits of having full time oiling to the connecting rods far outweighs the small amount of load bearing capacity you give up. machine shop owner and engine builder

Re: early 360 (71-73) main bearing question? [Re: Performance Only] #758415 07/29/10 12:48 AM 07/29/10 12:48 AM
Joined: Mar 2010 Posts: 162 monticello,ms andy3965 OP member
andy3965 OP member Joined: Mar 2010 Posts: 162 monticello,ms	thanks guys, i think i will just go with the 3/4 groove '71-'73.my truck should rarely see anything past 6800 so i think those will do MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!

Re: early 360 (71-73) main bearing question? [Re: andy3965] #758416 07/29/10 02:10 AM 07/29/10 02:10 AM
Joined: Nov 2008 Posts: 660 San Diego formula S mopar
formula S mopar Joined: Nov 2008 Posts: 660 San Diego	I personally use MS1266P 74 to 80 main bearings full grove with wide thrust on my 71 360 block. If you use these bearings you may have to chamfer the thrust bearing a little bit on the back side because the block could use a little more relief in this area, but to chamfer the bearing a little is no big deal, I've been running mine that way for years

Re: early 360 (71-73) main bearing question? [Re: formula S] #758417 07/29/10 07:57 AM 07/29/10 07:57 AM
Joined: Mar 2010 Posts: 162 monticello,ms andy3965 OP member
andy3965 OP member Joined: Mar 2010 Posts: 162 monticello,ms	formulas, thanks. thats the kind of info i was looking for. i will go ahead and pull the trigger on a set of full groove '74 and up bearings and try 'em out. MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!

Re: early 360 (71-73) main bearing question? [Re: andy3965] #758418 07/29/10 11:28 AM 07/29/10 11:28 AM
Joined: Nov 2008 Posts: 660 San Diego formula S mopar
formula S mopar Joined: Nov 2008 Posts: 660 San Diego	Quote: formulas, thanks. thats the kind of info i was looking for. i will go ahead and pull the trigger on a set of full groove '74 and up bearings and try 'em out. Your welcome, Glad I could help

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