360 Block Question
#2084347
06/01/16 11:03 PM
06/01/16 11:03 PM
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Joined: Jan 2003
Posts: 2,155 Tucson, Arizona
clonestocker
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I've got a 360 block that came out of an E58 1975 Dart Sport. Was cast on the night shift 11.27.1974. What are the chances it has thicker cylinder walls? Can you tell by how much it weighs? Let me know. thx matt
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Re: 360 Block Question
[Re: clonestocker]
#2084356
06/01/16 11:13 PM
06/01/16 11:13 PM
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Joined: Jan 2005
Posts: 12,423 Kalispell Mt.
HotRodDave
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I Live Here
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Kalispell Mt.
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It is cast after the 340 production ended, the theory goes the 340 and concurent 360s used the same cylinder walls. After that they all went thin so it is well into the thinwall production time frame. That being said even if it was in the "340 wall" era I would not want to go more than .030 over without sonic testing.
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Re: 360 Block Question
[Re: clonestocker]
#2084358
06/01/16 11:14 PM
06/01/16 11:14 PM
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Joined: Feb 2005
Posts: 20,197 PA.
pittsburghracer
"Little"John
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"Little"John
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PA.
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How big are you going with it. Being the budget racer I am up to .030 over I don't even bother checking them, but that's me. If it keeps you awake at night have it sonic checked
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 360 Block Question
[Re: clonestocker]
#2084394
06/02/16 12:15 AM
06/02/16 12:15 AM
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Joined: Dec 2005
Posts: 11,668 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
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Posts: 11,668
Fulton County, PA
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Early block casting number is 3418496. These are supposed to have the same water jacket as the 340 so theoretically they could go .070 or .080 over. Core shift being what it is, I would have one sonic tested before going crazy with it.
If the results don't match the theory, change the theory.
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Re: 360 Block Question
[Re: clonestocker]
#2084403
06/02/16 12:31 AM
06/02/16 12:31 AM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
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Oh No!! I just had a moron attack!
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Its a TRAP!
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10.10.73 date Casting No. 3418496-360-10 block for mine too. Seems .060" over is no problem according to my machinist. He's seen plenty of those blocks.
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Re: 360 Block Question
[Re: DARTH V8Я]
#2084412
06/02/16 12:53 AM
06/02/16 12:53 AM
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Joined: Jan 2003
Posts: 2,155 Tucson, Arizona
clonestocker
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My blocks casting # is 4006830-360-5. I've also got a 340 block casting # 2780930-340-6 but that block has been punched .040 already.
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Re: 360 Block Question
[Re: clonestocker]
#2084419
06/02/16 01:07 AM
06/02/16 01:07 AM
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Joined: Dec 2005
Posts: 11,668 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,668
Fulton County, PA
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4006830 is the late thin wall casting. Probably should be checked at anything more than 030 over.
If the results don't match the theory, change the theory.
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Re: 360 Block Question
[Re: clonestocker]
#2084575
06/02/16 12:14 PM
06/02/16 12:14 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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master
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Az
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I've got a 360 block that came out of an E58 1975 Dart Sport. Was cast on the night shift 11.27.1974. What are the chances it has thicker cylinder walls? Can you tell by how much it weighs? Let me know. thx matt I have 3 "E58 motors, all out of 79 300's. Two I had sonic checked and all had thick walls ( around .200"). The E58 motor had a bunch of special parts in it. The block should be stamped 360HP with serial #. Fifth digit of the VIN should be "L" for E58 engine car. Body code plate should have "E58" stamped on it. E 58 engines also came with a windage tray ( same as early HP 340's and 360's), specially selected ( what ever that means )cast iron crank, Larger cast iron exhaust manifolds, "360 Premium engine" sticker on the valve covers. Not sure on the last item on California package cars though. Engine ID is located just below left cylinder head. Example: 9W 360HP 6345. Translates to: 9=1979, W= Windsor plant, 360HP = displacement, 6345 = date code ( Dec. 11, 1979) Above info came from printed Chrysler data. Got a problem, take it up with them.
Fastest 300
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Re: 360 Block Question
[Re: clonestocker]
#2084665
06/02/16 03:51 PM
06/02/16 03:51 PM
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Joined: Dec 2005
Posts: 11,668 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,668
Fulton County, PA
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Anything from the '70s is suspect. Quality was all over the place. Core shift is possible on any of this stuff, regardless what it's supposed to be.
If the results don't match the theory, change the theory.
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Re: 360 Block Question
[Re: CMcAllister]
#2084708
06/02/16 05:21 PM
06/02/16 05:21 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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master
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Az
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Anything from the '70s is suspect. Quality was all over the place. Core shift is possible on any of this stuff, regardless what it's supposed to be.
for sure, and that holds true for ANY stock block, regardless of year. IMO, 500 HP or more for any stock block is a good rule of thumb for sonic testing.
Fastest 300
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Re: 360 Block Question
[Re: ccarson]
#2084732
06/02/16 06:06 PM
06/02/16 06:06 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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master
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Az
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My W9 360 Dakota project block is cast January 13 1971 3418496-4-360
It was sonic checked and all 8 bores ranged from .230"-.210" on the thrust side.
We bored this block .030" over and did a fill of Hard Block up to the freeze plugs before machining. Awesome. You should be good to go. I had a 1971 360 block out of a motor home that checked like that.
Fastest 300
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Re: 360 Block Question
[Re: Crizila]
#2084743
06/02/16 06:21 PM
06/02/16 06:21 PM
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Joined: Jan 2003
Posts: 2,155 Tucson, Arizona
clonestocker
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Lets say you a had a block that was .250 everywhere. What would be the maximum bore size that would be considered safe?
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Re: 360 Block Question
[Re: clonestocker]
#2084795
06/02/16 07:32 PM
06/02/16 07:32 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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master
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I would think .060 would not be a problem. Again, what kind of HP you want to push through it has a bearing on wall thickness / block rigidity.
Fastest 300
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