360 Identification
#1128313
12/05/11 07:47 PM
12/05/11 07:47 PM
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Joined: Aug 2011
Posts: 95
Idaho, USA
White440
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Idaho, USA
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I bought a 360 Saturday night that came out of a 1975 motor home and I am having some conflicting info on the numbers. The numbers on the driver side of the block are 4006830-360-4 which my Mopar engines 9th addition says its a 1976-80 block, but the numbers on the passenger side of the block read 4.8.75? If someone could help me understand I would appreciate it. One other question I have is what dose the -4 mean on the 360-4? 
"Full throttle until you see GOD then brake!" <img src="/ubbthreads/images/graemlins/drive.gif" alt="" /> Life's to short to ride the brakes!
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Re: 360 Identification
[Re: bboogieart]
#1128315
12/05/11 08:05 PM
12/05/11 08:05 PM
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Joined: Jan 2003
Posts: 74,937
U.S.S.A.
JohnRR
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I Win
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Quote:
My guess is the 76 model engine was built in 75.
the casting number won't dictate what model year and engine was built for.
As far as the conflicting info , I don't see any , the factory would start producing the a new casting ahead of the actual need . take the 400 engine , not available till 1972 but the castings started being done long before the actual model year.
I think the -4 would be the number of repairs to the core box , I get confused on that one.
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Re: 360 Identification
[Re: JohnRR]
#1128316
12/05/11 08:10 PM
12/05/11 08:10 PM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
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master
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Posts: 3,886
Lost and Spaced
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the factory would start producing the a new casting ahead of the actual need . take the 400 engine , not available till 1972 but the castings started being done long before the actual model year.
I'm sorry I thought this is what I said.
I have mechanical Aptitude.
I can screw up anything.
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Re: 360 Identification
[Re: White440]
#1128317
12/05/11 08:13 PM
12/05/11 08:13 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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4.6.75 is the actual casting date that was made in the sand for blocks poured that day and the 76 would be the model year and 76 models came out in the fall of '75 so blocks would have to be cast in '75 (& on into 76). No prob there. But the Mopar literature is notoriously inaccurate on the start/finish(s)of their (model year & other) stats as I had a '75 Cordoba that had a 4xxxxxx 360 original engine in it & I was expecting a (3) for the thin wall. The change from (3) series (before 76) to (4) denoted an overall change to the so called "thin wall" casting technique (big and small blocks) but susequent testing proved that alot of later thin walls were as or even thicker than the earlier blocks (See Andy's sonic testing article in the archives). Other than a 30 over DD build, sonic testing is the smart way to go. Cannot assume anything. On the suffix(-4) everytime they changed the mold cause it shifted or enough sand got used up from sticking to the block itself or another prob of any sort they changed that # to the next digit up. I'm assuming they started with 1 rather than zero and a lower # I believe is better as I'm not sure but I heard that the mold quality deteriorated w each change but being practical if it sonic checks you're set. for a high output I'd water pressure check/magnaflux also
live every 24 hour block of time like it's your last day on earth
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Re: 360 Identification
[Re: bboogieart]
#1128319
12/05/11 08:18 PM
12/05/11 08:18 PM
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Joined: Jan 2003
Posts: 74,937
U.S.S.A.
JohnRR
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Quote:
the factory would start producing the a new casting ahead of the actual need . take the 400 engine , not available till 1972 but the castings started being done long before the actual model year.
I'm sorry I thought this is what I said.
I guess you did, I just expanded on it because it didn't seem to be very clear.
There was a casting change made which is the reason for the new casting number , 360 production started in late 71 , castings earlier just like this block, and it would not be surprising, to me, to find a late build 75 model year car/truck with the changed over 360 casting considering how lousy Chrysler was with inventory control.
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Re: 360 Identification
[Re: White440]
#1128322
12/05/11 08:27 PM
12/05/11 08:27 PM
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Joined: Jan 2003
Posts: 74,937
U.S.S.A.
JohnRR
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Quote:
Ok so would this fall under the 360 with the same water jackets as the 340?
No it wouldn't, that's why there was a new casting number vs. that earlier 360 casting.
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Re: 360 Identification
[Re: RapidRobert]
#1128324
12/05/11 08:34 PM
12/05/11 08:34 PM
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Joined: Aug 2011
Posts: 95
Idaho, USA
White440
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Idaho, USA
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Thanks guys. I don't plan on boring this block. I'm putting it to gather for my truck daily driver, so its getting a re-ring job, mild cam, 302 heads (with a possible vale job) and ether some early mag exhaust manifolds or headers. I was just reading and was wondering about the water jackets and -4 so I thought I would try to learn something today 
Last edited by White440; 12/05/11 08:35 PM.
"Full throttle until you see GOD then brake!" <img src="/ubbthreads/images/graemlins/drive.gif" alt="" /> Life's to short to ride the brakes!
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Re: 360 Identification
[Re: White440]
#1128325
12/05/11 08:41 PM
12/05/11 08:41 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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I have a set of those '92/early 93 mag ex manis & they are streamlined & have a ~2&1/4" outlet as opposed to the 1&7/8" on the later ones, quite a diff & ex for the flange size they look identical (casting # may be diff). I too am doing a 302 build (318) & thinking going from 1.78" to 1.88 valves per advice (on here)
live every 24 hour block of time like it's your last day on earth
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Re: 360 Identification
[Re: RapidRobert]
#1128326
12/05/11 09:09 PM
12/05/11 09:09 PM
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Joined: Aug 2011
Posts: 95
Idaho, USA
White440
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Thats the thought I was headed for but was thinking (if its even possible) of going to 2.02\160 but I am thinking for what I'm planing it might be a little much idk, that might have to me another thread.
"Full throttle until you see GOD then brake!" <img src="/ubbthreads/images/graemlins/drive.gif" alt="" /> Life's to short to ride the brakes!
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Re: 360 Identification
[Re: RapidRobert]
#1128327
12/05/11 09:17 PM
12/05/11 09:17 PM
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Joined: Feb 2008
Posts: 28
Mississippi
bcr
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Mississippi
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Quote:
Quote:
Ok so would this fall under the 360 with the same water jackets as the 340?
Supposedly several early years of 360 has 340 cores and could stand a massive overboring (given that a 340 is a 40 over 360 bore std) but I'd sonic check but just myself I'm not a fan of going over any more than needed so the bores stay rigid/stable and I'll gain power somewhere elso but that's just me & I do happen to have an early 360 std block (w caps) that I'd let go for reasonable money  if you twisted my arm a bit
Just want to clarify what I think I'm reading. A 75 360 should always be sonic checked before a .060 bore?
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