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Any problem boring 060" over? #2229128 01/07/17 02:35 AM 01/07/17 02:35 AM
Joined: Mar 2008 Posts: 73 Sunny South N Noah Zarq OP member
Noah Zarq OP member N Joined: Mar 2008 Posts: 73 Sunny South	I just bought a 360 off Craigslist. He sold it as a 318 (he's an import guy so he didn't know what he had) but once I scrubbed the dirt off the block I discovered it is a 1990 360 with a roller cam, that was run off propane. After opening it up I discovered it had been rebuilt at least once (as evidenced by the .040" Sealed Power pistons). All of the cylinders have a slight ridge at the top of the bores, barely enough to catch a fingernail, but one cylinder has a half inch long horizontal scratch that's deep enough to catch a fingernail. I also found the cause of the scratch, a piece of oil ring was in the oil pan. Since I'm looking at having it bored to the next size, is it really safe to go 060" over? I've heard these were thin walled and would run hot but I don't know. I'm not looking for a street/strip warrior, just a daily driver engine to replace the aged slant six in my 84 D100.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229129 01/07/17 02:37 AM 01/07/17 02:37 AM
Joined: Jan 2003 Posts: 104,346 Garden Grove, CA OzHemi Penguin-hating Ginger
OzHemi Penguin-hating Ginger Joined: Jan 2003 Posts: 104,346 Garden Grove, CA	Have your machine shop sonic check it, then no questions just what you are working with and what bore it will handle. It might be done as it is, but checking it should help know for sure.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229137 01/07/17 02:56 AM 01/07/17 02:56 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	Too bad it wasn't a 1971 Casting 360 block. They were cast based on the 4.04 340 casting. You can sometimes take them .100 over without trouble! As stated, the machinist can tell you. The sonic testing determines cylinder wall thickness. There really is no clear answer on going .060 over safely. I've read some rare instances where casting flaws have occurred, resulting in some abnormally thin spots even in standard bore blocks. ***Another option: If it is just ONE hole that needs work, ask about sleeving the cylinder. A buddy of mine has 2 sleeves in a 340. No problems and he saved a bunch of $$$ as compared to the cost of a replacement date coded 340 block.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229149 01/07/17 03:24 AM 01/07/17 03:24 AM
Joined: Mar 2008 Posts: 73 Sunny South N Noah Zarq OP member
Noah Zarq OP member N Joined: Mar 2008 Posts: 73 Sunny South	Thanks for the replies! I will have them sonic test the block. Sleeving the block sounds $$$. If it was a rare block though I could see spending the cash for that, but this is just an ordinary 360, nothing special. I was just worried that the cylinders might be thin and weakened by being overbored that much, but it's not going to be a high revving powerhouse, just a stock rebuild with a slightly hotter cam than stock. On a positive note, the heads and crank are darn near perfect.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229165 01/07/17 04:44 AM 01/07/17 04:44 AM
Joined: Aug 2003 Posts: 43,195 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,195 Bend,OR USA	Keep in mind that half of the over bore comes off each side,.020 from all sides, not .040 Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229186 01/07/17 10:21 AM 01/07/17 10:21 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	Sleeves are ~$100 per hole. Don't be afraid of them. The final result is actually stronger than original casting On the flip side, it's only a 5.9 magnum block that can be found for around $150 as a bare block or $250 as a full engine if you shop around n haggle Last edited by 70Cuda383; 01/07/17 10:23 AM. Photobucket sucks

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229201 01/07/17 11:20 AM 01/07/17 11:20 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Originally Posted By Noah Zarq I just bought a 360 off Craigslist. He sold it as a 318 (he's an import guy so he didn't know what he had) but once I scrubbed the dirt off the block I discovered it is a 1990 360 with a roller cam, that was run off propane. After opening it up I discovered it had been rebuilt at least once (as evidenced by the .040" Sealed Power pistons). All of the cylinders have a slight ridge at the top of the bores, barely enough to catch a fingernail, but one cylinder has a half inch long horizontal scratch that's deep enough to catch a fingernail. I also found the cause of the scratch, a piece of oil ring was in the oil pan. Since I'm looking at having it bored to the next size, is it really safe to go 060" over? I've heard these were thin walled and would run hot but I don't know. I'm not looking for a street/strip warrior, just a daily driver engine to replace the aged slant six in my 84 D100. I'd return it because it is not what was advertised and look for another one. IMO a 5.9 is not worth putting sleeves in. Nothing wrong with a 318 either IMO. .060 over in not a good thing to do with any mopar block.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229225 01/07/17 12:07 PM 01/07/17 12:07 PM
Joined: Mar 2006 Posts: 9,841 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,841 MI, usa	My Challenger has a 1976 360 that's .060" Street car driven everywhere for over 20 years, been 12.50@110. Doug

Re: Any problem boring 060" over? [Re: Challenger 1] #2229329 01/07/17 02:25 PM 01/07/17 02:25 PM
Joined: Jan 2004 Posts: 8,273 fredericksburg,va C cudaman1969 master
cudaman1969 master C Joined: Jan 2004 Posts: 8,273 fredericksburg,va	Originally Posted By Challenger 1 Originally Posted By Noah Zarq I just bought a 360 off Craigslist. He sold it as a 318 (he's an import guy so he didn't know what he had) but once I scrubbed the dirt off the block I discovered it is a 1990 360 with a roller cam, that was run off propane. After opening it up I discovered it had been rebuilt at least once (as evidenced by the .040" Sealed Power pistons). All of the cylinders have a slight ridge at the top of the bores, barely enough to catch a fingernail, but one cylinder has a half inch long horizontal scratch that's deep enough to catch a fingernail. I also found the cause of the scratch, a piece of oil ring was in the oil pan. Since I'm looking at having it bored to the next size, is it really safe to go 060" over? I've heard these were thin walled and would run hot but I don't know. I'm not looking for a street/strip warrior, just a daily driver engine to replace the aged slant six in my 84 D100. I'd return it because it is not what was advertised and look for another one. IMO a 5.9 is not worth putting sleeves in. Nothing wrong with a 318 either IMO. .060 over in not a good thing to do with any mopar block. I agree, hope you got it free. If you can't return it, sleeve it, hone the others then new rings. Finding another engine might put you in the same boat as now, crap shoot. Most all will need something done to it. Best bet is to find one running, hear it run for a least 20 minutes.

Re: Any problem boring 060" over? [Re: cudaman1969] #2229337 01/07/17 02:32 PM 01/07/17 02:32 PM
Joined: Mar 2008 Posts: 73 Sunny South N Noah Zarq OP member
Noah Zarq OP member N Joined: Mar 2008 Posts: 73 Sunny South	It wasn't free but pretty cheap. The heads and crank alone are worth what I paid for it, especially since it's already been turned and is beautiful. This engine shows signs it was rebuilt not too long ago but was an oil burner, and now I know why. Once the snow melts I'll get her to the machine shop for testing.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229400 01/07/17 03:43 PM 01/07/17 03:43 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Can you post pictures of the bores and the damaged bore? From your first post it sounded like the 40 over bore had ridges at the top? Maybe if the bores are not too bad the they could be rehoned and use the same pistons with new rings. If the damage is down low it may not effect how it runs. I have done a half a dozen stock rebuilds with a hone job only and all of them ran for many more miles after my re ring and new bearings. One motor had a gouged cylinder down low that I re used after just a hone. The cylinder sealed up fine and I even did a compression check on it years later and it was still good. We used that engine in a company van, 79 360 dodge van. Ran it 100K miles after a re ring job. Van had 200K + miles on it. I always used moly rings, they are "soft?" and seal up easier than most others, good for re ring jobs and stock rebuilds.

Re: Any problem boring 060" over? [Re: Challenger 1] #2229657 01/07/17 08:41 PM 01/07/17 08:41 PM
Joined: Mar 2008 Posts: 73 Sunny South N Noah Zarq OP member
Noah Zarq OP member N Joined: Mar 2008 Posts: 73 Sunny South	I'll try to get pics soon. The ridges at the top of the cylinders could be just carbon. I'm hoping it is. I'm going to have the machine shop check the bores to make sure they are round and how much they are worn. I may be able to get by with just a hone. Or I may just be overly optimistic.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229671 01/07/17 08:51 PM 01/07/17 08:51 PM
Joined: Jan 2003 Posts: 25,817 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,817 Rio Linda, CA	Originally Posted By Noah Zarq I'm not looking for a street/strip warrior, just a daily driver engine to replace the aged slant six in my 84 D100. Scuff up the bores and put a ring/bearing/gasket kit in it. Might use a little more oil than a full rebuild but oil's cheaper than machine work. The INTERNET, the MISinformation superhighway

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229819 01/08/17 12:01 AM 01/08/17 12:01 AM
Joined: May 2003 Posts: 6,562 Downtown Roebuck Ont Twostick Still wishing...
Twostick Still wishing... Joined: May 2003 Posts: 6,562 Downtown Roebuck Ont	A show of hands. How many people here have actually seen a .060" over cylinder fail in a stock type build in ANY Mopar block? Thought so. Kevin

Re: Any problem boring 060" over? [Re: Noah Zarq] #2229825 01/08/17 12:15 AM 01/08/17 12:15 AM
Joined: Dec 2003 Posts: 4,951 northwest USA N NANKET master
NANKET master N Joined: Dec 2003 Posts: 4,951 northwest USA	How high in the bore is the scratch from the broken ring?

Re: Any problem boring 060" over? [Re: Twostick] #2229913 01/08/17 10:54 AM 01/08/17 10:54 AM
Joined: Jan 2003 Posts: 10,721 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,721 North Dakota	Originally Posted By Twostick ....How many people here have actually seen a .060" over cylinder fail in a stock type build in ANY Mopar block?....Kevin A few years ago one of the members bored a 383 out to 0.060 over and had it sonic checked. Thrust face was right at 0.090 and he asked if he could run at that. I replied that he could, he believed me and did, ended up with a cylinder wall crack. So yes, Virginia, it does happen. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: Any problem boring 060" over? [Re: 6PakBee] #2229989 01/08/17 01:14 PM 01/08/17 01:14 PM
Joined: Nov 2013 Posts: 595 Nashville, Tennessee Tempest mopar
Tempest mopar Joined: Nov 2013 Posts: 595 Nashville, Tennessee	Originally Posted By 6PakBee Originally Posted By Twostick ....How many people here have actually seen a .060" over cylinder fail in a stock type build in ANY Mopar block?....Kevin A few years ago one of the members bored a 383 out to 0.060 over and had it sonic checked. Thrust face was right at 0.090 and he asked if he could run at that. I replied that he could, he believed me and did, ended up with a cylinder wall crack. So yes, Virginia, it does happen. I did worse with another make. However, I was not aware of the problem when I bought the block. It was only +.030" but was a 700HP, high RPM motor. Had all the good stuff, light weight JE pistons, Al rods, roller cam etc. Previous owner never sonic checked block when they made into race motor. Thrust wall was .080", other side .300". It had core shift. Fate caught up with it. Finally at top of 2nd gear around 7,200 it let go. Everything that moved in the motor was junk. I mean everything. I would never do a performance motor ever again without sonic checking.

Re: Any problem boring 060" over? [Re: Noah Zarq] #2230000 01/08/17 01:27 PM 01/08/17 01:27 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: I'm not looking for a street/strip warrior, just a daily driver engine to replace the aged slant six in my 84 D100. Low po DD, the odds are well in your favor. What Nanket said, more info on the scratch. EDIT with more thought (& rereading your OP) I would NOT rebore it but just rering it with some file fit plasma moly rings with dingleberry honing it with a their 320 grit. I dont think that scratch will be any problem & I would bet my last dollar that you will be fine & end up with more power & plenty of longevity (plus you're gaining almost 40 cubes) & you could spend some of that cash on milling the heads. Last edited by RapidRobert; 01/08/17 02:13 PM. Reason: more info/thought live every 24 hour block of time like it's your last day on earth

Re: Any problem boring 060" over? [Re: Noah Zarq] #2230147 01/08/17 05:14 PM 01/08/17 05:14 PM
Joined: Nov 2013 Posts: 595 Nashville, Tennessee Tempest mopar
Tempest mopar Joined: Nov 2013 Posts: 595 Nashville, Tennessee	Agree with this ^^^^ for a street motor.

Re: Any problem boring 060" over? [Re: Tempest] #2230524 01/09/17 12:34 AM 01/09/17 12:34 AM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Yes, Blazin' Bob has the answer. Don't worry about it. The ridge is probably carbon and can come off with a pocket knife. It's a cheap block and not worth sonic checking. I'd sleeve it first if 0you must, leave it at 40 over. BTW, a '9 360 block is NOT a 5.9 Mag block. R. Last edited by dogdays; 01/09/17 12:36 AM.

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