360 Torque Monster build
#141569
10/26/08 11:29 AM
10/26/08 11:29 AM
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Joined: Dec 2003
Posts: 168 RI
MOPARS6768
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OP
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Joined: Dec 2003
Posts: 168
RI
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I am going to build a 360 for my 85 W350 Crew Cab. It has a 727/np205/dana60 4.10gears and 33" tires. I have 2 complete 360 engines one has a 71 cast date that is a standard bore 2bbl truck engine. The other is an 86 cast date 4bbl truck engine. I plan to build the 71. I have been looking for a reliable combination that produces good power at low RPM and runs on pump gas. I was looking at the 360 torque monster build in the tech archives http://www.moparts.org/Tech/Archive/smallblock/8.html. My question is how would this combination work if I used 360 heads that already have the larger valves? What is the advantage of the 302 heads is it the smaller combustion chambers produce more compression? I have a set of 915 heads on the 71, I'm not sure whats on the 86 and might be able to get a set of 308's. I plan on about 9.1 to 9.5 compression so it will have no problem running on pump gas. If any one has any other good 360 truck builds please post them This is my first engine build and I am trying to learn as much as possible. Thanks, Brian
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Re: 360 Torque Monster build
[Re: AdamR]
#141571
10/26/08 01:24 PM
10/26/08 01:24 PM
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Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
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I Live Here
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Kalispell Mt.
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I have built several tq oriented 360s if I was doiong another one I would use a 360 with KB107 pistons at zero deck. Get magnum heads with just a touch of port work and a 30 degree back cut on the valves. They will make more hp and tq then even the 302 heads. To get the 302 to the same amount of flow as a magnum they need a ton of work and the chamber is just plain better in the magnum witch helps tq even more. Either have the bolt holes redrilled to use LA intakes or get a RPM air gap intake for the mag heads. Use a comp XE262 cam or a similar Voo-Doo cam. Use a felpro .039 thick head gasket. You will end up around 10 to one compression and it will run fine on pump gas because the magnum chamber is so good.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 Torque Monster build
[Re: MOPARS6768]
#141573
10/26/08 04:01 PM
10/26/08 04:01 PM
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Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
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I Live Here
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Posts: 12,424
Kalispell Mt.
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Since you have it already I would use the eddy. It is a good carb for that set up. You will need pushrods for the conversion from mopar performance and you will need the rockers and if you want to use your LD340 (good choice) you need to have the intake bolt holes re-drilled.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 Torque Monster build
[Re: MOPARS6768]
#141575
10/26/08 11:44 PM
10/26/08 11:44 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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master
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Posts: 5,399
Aurora, Colorado
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I read the article in the tech archives, and they were using the Mopar P4452757 cam that specs out with 248/256 advertised duration and 0.410"/0.425" lift 110 LSA. That is a very mild and nearly stock cam. A stock 360 cam specs are 252/265 duration and 0.410"/0.412" lift.
The stock 318 engine in my 1986 W150 has the MoPar P4452759 cam, 260/268 duration, 0.430"/0.450" lift and it run pretty good.
My first 360 RV engine was built around 1979, and it was a basic 0.030" over with 9:1 compression flat top pistons, reconditioned stock heads, a mild Crower Baja Beast cam (I think it was about 210 duration @ 0.050".) That engine had headers, dual exhaust, a Holley street dominator single plane and a Holly 600 DP carb. That engine performed very good, and it semed to pull well from idle to 5,000 RPM.
I just freshned up another 360 I built a few years back. The engine used the KB232 Quench dome pistons for about 9.5:1 compression, AeroHead 360 heads with the 2.02"/1.60" valves and hardened seats. I did a mild porting job on the heads too. Originally I had a Hughes HE0914AL Cam (I think 208/215 duration @ 0.050?) and the recommended single springs/retainers. The engine used the standard Edelbrock Performer intake that was gasket matched to the 360 port size, and at the time I was running an Edelbrock 625 cfm AFB carb. This engine ran pretty good too, but I wanted more power so when I fresheded up the engine (re-ring, new bearings, etc.) I installed the Hughes HEH1523AL cam that specs out at 215/223 duration @ 0.050", 112 LSA, and 0.501"/0.539" lift using Crane 1.6:1 rocker arms. I also installed a Holley 670cfm Truck avenger carb, and Crane HI-6 ignition. Once I got the carb tuned the engine was running very strong.
If I built another 360, I would probbably just use a flat top piston like the Speed-Pro H116CP. The KB232 takes too much machine work, having to narrow pin width on the rods to 1", and mill the block and heads to get the correct quench. I think I would also use the magnum style heads. The magnum heads require rocker arm oiling through the pushrods, but that is no a big deal. That Hughes HEH1523AL cam is really nice for torque and performance, but if you want torque and economy you may want a slightly smaller cam.
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Re: 360 Torque Monster build
[Re: 451Mopar]
#141576
10/27/08 12:18 AM
10/27/08 12:18 AM
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Joined: Jun 2004
Posts: 893 Tustin, CA
pishta
super stock
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super stock
Joined: Jun 2004
Posts: 893
Tustin, CA
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How about an easy bolt on for an otherwise stock motor, an Edelbrock SP2P intake, pencil sized runners, will pull a trailer at idle and will never see the sunny side of 4000 RPM.
12 Grand Caravan 06 T&C 02 T&C 96 Breeze 65 Barracuda "S"
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Re: 360 Torque Monster build
[Re: MOPARS6768]
#141578
10/27/08 08:55 AM
10/27/08 08:55 AM
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Joined: Apr 2007
Posts: 2,826 NY usa
540challenger
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
Thanks for the replys I am starting to lean towards the magnum head swap. Are all the magnum heads from 93-03 the same? Is there any difference between the 360 and 318 magnum heads. I have a quite few junkyards around that have trucks with magnum engines. Thans, Brian
All the Magnum heads are the same from the different years, motors, and castings.
Same size ports, values, and combusation chambers
However certain years were less like to crack then others a common problem in magnum heads.
I don't remeber the years but the 318 heads were less likely to be cracked.
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Re: 360 Torque Monster build
[Re: MOPARS6768]
#141583
10/28/08 08:44 AM
10/28/08 08:44 AM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
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I Live Here
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Grand Haven, MI
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if you don't plan on revving much past 4000 RPM either the mag or 302 heads will fit the bill...both will make about the same torque, the mags will pull to 5k-5500 RPM with a decent cam to make more HP.
for pistons, I'd use KB107's or sealed power H116CP's at 0 deck...with the closed chambered heads, you're looking at ~10.6:1 comp. I'd polish the chambers and knock off any sharp corners on the piston face to reduce the chance of hot spots/detonation. 302 heads, I'd just get a good 5 angle VJ, if you get into swapping valves out, I'd just go magnums.
if you go magnums, check out the enginequest mag heads from CMEngines.com. they quoted me a good price earlier this year. I'd have them set them up with OEM valves, 5 angfle valve job with the throat of the bowl 80-85% the valve diameter, and OEM GM 3.1/3.4/3.5L springs/retainers set up at about 1.67" IH. the 318B's are drilled with an LA intake pattern, I'd get those, and use an eddie performer intake and a tquad or Qjet.
for a cam, I'd look at the voodoo 60401 (302 head w/1.5 rockers)) or comp XE256 (mag head with 1.6's) with that amount of compression. I think you'd be fine on pump 93, maybe even pump 89 with one of these cams and have a boat load of torque & great throttle response.
one advantage of the mag engine is you get the ability to use a hydraulic roller cheaply.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 360 Torque Monster build
[Re: patrick]
#141584
10/28/08 09:15 AM
10/28/08 09:15 AM
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Joined: Aug 2004
Posts: 3,333 MARYLAND
69Cuda340S
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Posts: 3,333
MARYLAND
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Quote:
if you go magnums, check out the enginequest mag heads from CMEngines.com. they quoted me a good price earlier this year. I'd have them set them up with OEM valves, 5 angfle valve job with the throat of the bowl 80-85% the valve diameter, and OEM GM 3.1/3.4/3.5L springs/retainers set up at about 1.67" IH. the 318B's are drilled with an LA intake pattern
I'd put some Engine Quest heads on there. They are new, cheap, and the quality of the cast is better then the factory heads. Here is an article on putting magnum heads on the LA block:
http://www.moparts.org/Tech/Archive/smallblock/7.html
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Re: 360 Torque Monster build
[Re: goldmember]
#141587
10/28/08 06:16 PM
10/28/08 06:16 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I've seen 10:1 work on pump gas but the quench was correct(.035-040)
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