Author Topic: decent 360 build  (Read 2296 times)

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Offline Mopar1984

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decent 360 build
« on: May 13, 2011, 06:46:23 PM »
What is a good decent build for a 360 in a 84 rc. Never really any off road just lookin for decent street performence. Rv cam, 30 over,.. ??
1983 Ramcharger 360, 4 speed, 600cfm edelbrock, performer intake, msd 8mm wires, mopar performence ignition, dual flowmaster exhaust, 4' skyjacker soft ride lift, rancho shocks, dual steering stabilizer, MT rims, 35" BF Goodrich all terrian, birdbath hood conversion

Offline Macho4x4Warlock

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Re: decent 360 build
« Reply #1 on: May 13, 2011, 07:12:38 PM »
Are there any Test emission restrictions in Canada?
If not, build it like you put: 30 over with RV cam. Want more?
Go to higher compression with better heads (Aluminum Edelbrock type) and aluminum intake with tube headers.
Late model '74 Plymouth TrailDuster. Stock 360-4 "T" motor, auto. dana 60R, 44F, Rough Country all around 4"non block lift. 34"x16"x 8" rim & tires. '89 RC interior. 35G tank, 440 Radiator. Many other mods..........

Offline Mopar1984

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Re: decent 360 build
« Reply #2 on: May 13, 2011, 07:43:13 PM »
Anything older then 88 dosent need e testing. Do u got any idea what the power/torque would be on that type of build.
1983 Ramcharger 360, 4 speed, 600cfm edelbrock, performer intake, msd 8mm wires, mopar performence ignition, dual flowmaster exhaust, 4' skyjacker soft ride lift, rancho shocks, dual steering stabilizer, MT rims, 35" BF Goodrich all terrian, birdbath hood conversion

Offline smokey y

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Re: decent 360 build
« Reply #3 on: May 13, 2011, 11:30:28 PM »
260-300hp 350-400TQ Thats what i here with a 8.5 pistons 3 valve angle job on your heads and a
camshaft in the 260-268 duration range. Overbore only do what is ment to be done. Lets
say you need a .15 overbore over bore it .20. Never bore a motor out more than it needs too
be. I do think back to the comando 360 crate motors there was a 300hp and a 365hp
one. The 300hp one was a reg production 360 with 8.5 pistons a mopar 450/455 cam
and a M1 dual plane intake 600 cfm carb and small tube headers. also had 1.88 valves. Most
of your power made or loss would be in the cam you pick. My 3 cams for a mopar would
be the mopar 450/455 A hughes grid or engle. If I did my 360 build over again i would of
ran the mopar 450/455 or talked to hughesengines more. lost my job had to save some money.
My 360 with a 0.40 overbore 8.75 C/R Summitt 262 cam 3angle valve job with 1.88 intake
valves mildly ported heads on both sides with a portmached perfomer. I had 2 people
run my engine on a desk top dyno and got 2 way diff numbers a 278hp4600rpm
and 386tq2700rpm the second was 307hp 4900rpm and 410 3000rpm I tend to beleave
 I`m closer to the first set of numbers that was with 1-5/8 headers with both numbers
« Last Edit: May 13, 2011, 11:33:41 PM by smokey y »
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Offline Bogie

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Re: decent 360 build
« Reply #4 on: May 15, 2011, 12:33:23 AM »
Flat top pistons of choice (I used Keith black 107's) Sealed Power also makes some
Full Grove Main Bearings (Oil to the Roda ALL the Time)
High Volume Oil Pump (NOT High Pressure, This goes with the bearings)
Timing Chain Tensioner (Cloyes PN #9-5387)

I used Jegs Cam #555-200160 Lift: .420"/.442" which I am very happy about good all around power with most of it low in the RPM range. According to Desktop Dyno 322 HP @ 4500 RPM & 444 Ft-Lb @ 3000 RPM

I am big on reliability upgrades over Hp upgrades I didn't need high HP I wanted all the TQ I could get having a 6K Lb truck. I added a windage tray, studs,ARP Rod Bolts,Deep Oil Pan, Remote Filter.

It was a quick build I will probably add a Hughes cam
84 W350 Crew Cab ,37" SSR's
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Offline smokey y

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Re: decent 360 build
« Reply #5 on: May 15, 2011, 04:14:57 AM »
bogie those 107 KB i thought were 10-1 pistons  how does it run 87 octane with iron heads
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Offline Mopar1984

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Re: decent 360 build
« Reply #6 on: May 15, 2011, 06:51:56 AM »
As far as headers go I'm gonna try and stay away from them I'm having a bad eperiance with them on my truck now ever since I put them on they have leaked atleast 15 times I've had to change the gaskets and they are so dam rusty I'm suprised there isn't holes in them I'm used heat paint and treated them and everything. I was talkin to a guy he said I can have my manifold polished and ported on the inside for better flow. Is this true? I'm thinkin I'm gonna keep my stock intake I hear that's a decent intake even stock. I'm gonna look into this stuff see what its gonna cost me.
1983 Ramcharger 360, 4 speed, 600cfm edelbrock, performer intake, msd 8mm wires, mopar performence ignition, dual flowmaster exhaust, 4' skyjacker soft ride lift, rancho shocks, dual steering stabilizer, MT rims, 35" BF Goodrich all terrian, birdbath hood conversion

Offline smokey y

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Re: decent 360 build
« Reply #7 on: May 15, 2011, 08:51:13 AM »
your stock 360 iron intake is fine. exh maifold help the magnum motors in 92 and maybe 93 had
larger runners inside them 2-1/8 for the magnums and 1-7/8s for most later manifolds and
pre magnum manifolds
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Offline Mopar1984

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Re: decent 360 build
« Reply #8 on: May 15, 2011, 10:47:53 AM »
So r u sayin I should try and get a hold of magnum manifolds?
1983 Ramcharger 360, 4 speed, 600cfm edelbrock, performer intake, msd 8mm wires, mopar performence ignition, dual flowmaster exhaust, 4' skyjacker soft ride lift, rancho shocks, dual steering stabilizer, MT rims, 35" BF Goodrich all terrian, birdbath hood conversion

Offline 85 Royal SE Prospector

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Re: decent 360 build
« Reply #9 on: May 15, 2011, 11:29:53 AM »
So r u sayin I should try and get a hold of magnum manifolds?
Yeah. I think they're like $80/side new but you should be able to get some from a van, Dakota, or Ram cheap.

The 360 intakes are pretty decent stock.
1985 Dodge Royal SE Prospector Ramcharger 318 4x4

Offline Bogie

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Re: decent 360 build
« Reply #10 on: May 15, 2011, 07:49:47 PM »
bogie those 107 KB i thought were 10-1 pistons  how does it run 87 octane with iron heads


No issues so far.
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Offline Gohot

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Re: decent 360 build
« Reply #11 on: May 16, 2011, 06:27:26 AM »
I was talkin to a guy he said I can have my manifold polished and ported on the inside for better flow. Is this true?

What you probably heard on the P&P was a product/procedure called 'Extrude Hone' It is a procedure where a abrasive 'clay like' .........uh.... clay with abrasives combined  that is forced through your manifold and this effectivly sands the interior, and if done several times actually removes some metal and in the process shines and smooths the interior. I'm not sure if they are even a Company still?
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Offline Gohot

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Re: decent 360 build
« Reply #12 on: May 16, 2011, 06:31:23 AM »
Bogie, After your rebuild, what were your MPG figures, and if worse, could you improve with gears do you think? "in your particular situation" .   
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Offline sls001

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Re: decent 360 build
« Reply #13 on: May 16, 2011, 07:28:42 AM »
bogie those 107 KB i thought were 10-1 pistons  how does it run 87 octane with iron heads


Remember his final compression ratio is also dependent on the combustion chamber size, head gasket thickness, etc, etc. so his compression could be lower (or higher).  I didn't see which heads Bogie had used.

Head vol.- Comp.ratio for the KB107's
62cc -10.9
64cc - 10.7
68cc - 10.2
72cc - 9.8


Offline 85 Royal SE Prospector

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Re: decent 360 build
« Reply #14 on: May 16, 2011, 10:30:23 AM »
I was talkin to a guy he said I can have my manifold polished and ported on the inside for better flow. Is this true?

What you probably heard on the P&P was a product/procedure called 'Extrude Hone' It is a procedure where a abrasive 'clay like' .........uh.... clay with abrasives combined  that is forced through your manifold and this effectivly sands the interior, and if done several times actually removes some metal and in the process shines and smooths the interior. I'm not sure if they are even a Company still?
Extrude honing is a common machining process mostly used to open up stock intake/exhaust manifolds for increased flow.
1985 Dodge Royal SE Prospector Ramcharger 318 4x4

Offline Bogie

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Re: decent 360 build
« Reply #15 on: May 16, 2011, 07:10:31 PM »
Sorry guys I didn't have much time to reply. My CR did come out to 9.7x:1 power is vastly improved over the original 360 mileage is probably a bit better then is was but I really need a new carb to get it optimized. It has a 650 Holley on it now that I have had nothing but problems with it will be getting a carter soon. As far as gears go its not bad with 4.11's and 37's cruising at 70 is about 2300 RPM if I had better access to offroad it more gears might help but I'll just use low range.
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Offline ToxicDoc

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Re: decent 360 build
« Reply #16 on: May 16, 2011, 07:27:40 PM »
As far as headers go I'm gonna try and stay away from them I'm having a bad eperiance with them on my truck now ever since I put them on they have leaked atleast 15 times I've had to change the gaskets and they are so dam rusty I'm suprised there isn't holes in them I'm used heat paint and treated them and everything. I was talkin to a guy he said I can have my manifold polished and ported on the inside for better flow. Is this true? I'm thinkin I'm gonna keep my stock intake I hear that's a decent intake even stock. I'm gonna look into this stuff see what its gonna cost me.


The company is http://www.extrudehone.com/ .  I wouldn't do it for the intake, since that isn't very restrictive, but the exhaust, in general, is more the issue.  I have the Magnum manifolds, with the Extrude hone proce$$, and dual exhaust. 

If you go with the Mag exhaust, you will need to modify your pipes.  For the LA engines, the dump is in the center.  The Magnum dumps in the rear. It would be quite helpful for you if you could find the down pipe (91-93 5.2, or '93 5.9) at a salvage yard.  They are no longer reproduced and custom work adds a lot to the cost.
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Offline mttaff

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Re: decent 360 build
« Reply #17 on: May 17, 2011, 10:43:22 AM »
Bogie, what heads are you running? Ive got the 107's and im thinking of running the 318 heads. i think they have 1.88 valves if im not mistaken. good or bad?
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Offline 85 Royal SE Prospector

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Re: decent 360 build
« Reply #18 on: May 17, 2011, 12:32:32 PM »
Bogie, what heads are you running? Ive got the 107's and im thinking of running the 318 heads. i think they have 1.88 valves if im not mistaken. good or bad?
Generally a bad idea. If it were a stock motor and the heads were really worked it wouldn't be a great idea but since you'd be putting in high compression pistons it makes it less of a good idea. Better to just run stock heads or some other 360 heads.

318 heads flow like junk except the Magnums. 318 heads from '67-'91 have 1.78 int 1.50 exhaust and small narrow intake ports. They can not be opened up to 360 port size reliably.

Magnums are pretty close in flow on the intake to stock 360 heads (less because of smaller intake ports) and flow more on the exhaust. But they also have closed chambers and swirl ports.
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Offline mttaff

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Re: decent 360 build
« Reply #19 on: May 17, 2011, 03:50:24 PM »
thats what i wanted to know! thanks
78 crewcab, d60's,        6" lift and 35's                                76 ramcharger, d60's,   6" lift and 35's

Offline Bogie

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Re: decent 360 build
« Reply #20 on: May 17, 2011, 04:17:42 PM »
I'm running a set of stock 360 heads that have been freshened up and gasket matched.
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Offline 85 Royal SE Prospector

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Re: decent 360 build
« Reply #21 on: May 17, 2011, 08:19:40 PM »
thats what i wanted to know! thanks
Great, glad it helped.
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Offline smokey y

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Re: decent 360 build
« Reply #22 on: May 17, 2011, 09:02:35 PM »
No issues so far.
Dang i had a shot on getting those 107 KBs when i was working. everybody told me 10-1
would be a pinging motor on low grade fuel. Glad to here someone is having good luck with somthing
above 9.5-1 on regular grade fuel
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Offline chrysler300le

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Re: decent 360 build
« Reply #23 on: May 17, 2011, 10:56:51 PM »
10:1 would most likely ping with 87 to 90 octane gas.  Even if you can't hear it don't mean its not pinging.  Go for around 9:1 compression ratio.
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Offline Direct Action Motorsports

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Re: decent 360 build
« Reply #24 on: May 18, 2011, 05:54:24 AM »
I had a 69' 440 running 10.25:1 compression that didn't ping at all running 91 octane pump gas when I was in Reno, Nv. Elevation is around 5000' but when I drove it down to near sea level I had to add about 25% 108 octane race gas to get it to stop pingging.  Depending on the elevation you are at, it can really effect how you build your engine.
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