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Any 360 Magnum users out there?
Posted By: joedust451
Any 360 Magnum users out there? - 09/19/09 05:31 AM
Just wondering how well you like them, i hear pros & cons on there perf. I'm hyped up about installing this 360 magnum i have in my Swinger, granted its stock, the only thing it'll have is headers/intake & carb, just wanting to see how well you like yours!
Posted By: Intense RT Dan
Re: Any 360 Magnum users out there? - 09/19/09 06:05 AM
Not exactly the same but...I have a '99 Dakota R/T and even with the stock cam they can run well. I'm running about a 13.4 corrected et with bolt ons. I'm still efi. Very mild head work to stock heads, Harland Sharp non adjustable rockers, Rhodes Vmax roller lifters set to .010 lash on stock 198 @.050 cam with .464 lift, m1 2bbl efi intake, 980 cfm throttle body, Edelbrock shorty headers, underdrive crank pulley, and electric fan. This is in a truck that weighs 3980lbs. No problems. Just do oil changes.
Posted By: joedust451
Re: Any 360 Magnum users out there? - 09/19/09 06:23 AM
My goal is to be in the mid 12s (or better) with some spray (100-125 NX), other then the bolt-ons, i may add a small converter, plan on 3.55 gears & 26" DRs, don't know if the engine will achieve mid 13s NA in a 71 Dart running a stock cam/heads, i'm hoping it will.
Posted By: Intense RT Dan
Re: Any 360 Magnum users out there? - 09/19/09 06:36 AM
I don't see a problem there. Even possible NA.
I don't even have a higher stall yet, stock in mine is just shy of 1700. I have 3.92 gears and the gearing is just now getting to the point, since shifting peak hp higher, I need a little more.
What's the weight going to be? I think a stall around 2500 would work well being near stock. I think it would help me also.
As far as nitrous, I haven't run it, but the general concensus on a stock bottom end is that 100 is safe enough to run all day long. 150 is where it's possible to cause damage. I don't think you'll need that much to reach your goal.
Your 26" tires will help also.
Posted By: StandOnIt
Re: Any 360 Magnum users out there? - 09/19/09 11:50 AM
I have a 97' 5.9 with a 4" crank, iron heads and the mp .501/.513 circle track hyd roller ( forgot the duration ) in a 76 volare. Very dependable and low buck setup running 11.20's in the 1/4. We have a scamp with a stock stroke 5.9, same camshaft and stock magnum heads running 11.40's in the 1/4. Both have holley carbs with an M1 single plane carb. The volare has a stock 904 and 4.30 rear gear and the scamp has a stock 727 with 4.30 rear gear. Both cars are budget bracket cars and run season after season without even pulling a valve cover.
Posted By: joedust451
Re: Any 360 Magnum users out there? - 09/19/09 07:25 PM
Nother question, someone said i can longate one of the holes on the magnum flexplate & just use it, but will i need to change the converter to one with weights for the magnum, because i'm sure the 71 318 doesn't have weights on the converter.
Posted By: patrick
Re: Any 360 Magnum users out there? - 09/20/09 12:30 PM
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Nother question, someone said i can longate one of the holes on the magnum flexplate & just use it, but will i need to change the converter to one with weights for the magnum, because i'm sure the 71 318 doesn't have weights on the converter.
if you use the later flexplate (not sure if it's 96-up or more like 98 or 99), it has the weight on the flexplate so you use a neutral balance converter. B&M also makes a magnum weighted flexplate for a 727.
since the engine's out of the car, why not get the roller cam reground to something more sporting? it'll be less than $200, and another $100 or so for hughes 1110 valve springs, which can be used with junkyard 2.2L retainers
Posted By: joedust451
Re: Any 360 Magnum users out there? - 09/20/09 02:30 PM
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Nother question, someone said i can longate one of the holes on the magnum flexplate & just use it, but will i need to change the converter to one with weights for the magnum, because i'm sure the 71 318 doesn't have weights on the converter.
if you use the later flexplate (not sure if it's 96-up or more like 98 or 99), it has the weight on the flexplate so you use a neutral balance converter. B&M also makes a magnum weighted flexplate for a 727.
since the engine's out of the car, why not get the roller cam reground to something more sporting? it'll be less than $200, and another $100 or so for hughes 1110 valve springs, which can be used with junkyard 2.2L retainers
Its a 95, i'll see if theres weights on it. I've thought about doing something with the cam, but money is tight right now, i called hughes to get a cam recammendation, they wanted to put me in something with 560 lift., how much lift can you get regrinding one of these stock rollers?
Posted By: StandOnIt
Re: Any 360 Magnum users out there? - 09/20/09 02:49 PM
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Nother question, someone said i can longate one of the holes on the magnum flexplate & just use it, but will i need to change the converter to one with weights for the magnum, because i'm sure the 71 318 doesn't have weights on the converter.
Using B&M flexplates on both setups.
Posted By: patrick
Re: Any 360 Magnum users out there? - 09/21/09 11:27 AM
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Nother question, someone said i can longate one of the holes on the magnum flexplate & just use it, but will i need to change the converter to one with weights for the magnum, because i'm sure the 71 318 doesn't have weights on the converter.
if you use the later flexplate (not sure if it's 96-up or more like 98 or 99), it has the weight on the flexplate so you use a neutral balance converter. B&M also makes a magnum weighted flexplate for a 727.
since the engine's out of the car, why not get the roller cam reground to something more sporting? it'll be less than $200, and another $100 or so for hughes 1110 valve springs, which can be used with junkyard 2.2L retainers
Its a 95, i'll see if theres weights on it. I've thought about doing something with the cam, but money is tight right now, i called hughes to get a cam recammendation, they wanted to put me in something with 560 lift., how much lift can you get regrinding one of these stock rollers?
I had my roller cam reground by bullet with their 259/316 lobes for intake and exhaust. works out to .506" lift with mag rockers. I's stick to under .340" lobe lift if you don't want to spend a ton on springs and head machining. for a sporty mag 360, I'd probably go around their HR270/330 lobes for both intake and exhaust
http://bulletcams.com/Masters/HRlobes.htm
Posted By: Magnum
Re: Any 360 Magnum users out there? - 09/22/09 04:54 AM
Your biggest roadblock will be the tiny cam the Magnums use.
I have one in a truck and it is a nice combo for a truck. Especially when towing. In a car you'll want to cam it up and trade some of that below 2000rpm action for some 4500 rpm and higher play.
They are also a nice quality engine. I'm not even going to tell you how many miles are on my engine because nobody will believe it. I actually don't either but in 5000km I consume less than a quart of oil and it runs like perfect.
Posted By: joedust451
Re: Any 360 Magnum users out there? - 09/22/09 05:05 AM
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Your biggest roadblock will be the tiny cam the Magnums use.
I have one in a truck and it is a nice combo for a truck. Especially when towing. In a car you'll want to cam it up and trade some of that below 2000rpm action for some 4500 rpm and higher play.
They are also a nice quality engine. I'm not even going to tell you how many miles are on my engine because nobody will believe it. I actually don't either but in 5000km I consume less than a quart of oil and it runs like perfect.
I would get a cam, but hughes wants to put me in something with .560 lift, seems a bit steep for such a mild combo i want, i'm sure with 3.55 gears, it'll run fine with the stock cam for awhile, right now i have 2.76s, that should work really good, i'm bringing the heads in tomorrow & have them checked, hopefully there not cracked 
.
Posted By: Wedgeman
Re: Any 360 Magnum users out there? - 09/22/09 08:32 PM
Exactly, how much lift can we have using stock springs ?
Dan
Posted By: joedust451
Re: Any 360 Magnum users out there? - 09/22/09 10:21 PM
Had the heads looked at today, he knew exactly where to look, before he even mag'd them, he said "this ones crack", sure enough, cracked big time in-between the intake/exhaust, the other was cracked to, he said they crack at the end chamber between the valves, so now i'm kind-of screwed, i left them there, guess my only option are the Hughes "iron rams", but there out of them, but they have the RHSs for 875.00, i can also get a re-ground cam for 199.00 with my core, its .503 lift, what do you guys think, should i just get the RHSs & a re-ground cam?
Posted By: HotRodDave
Re: Any 360 Magnum users out there? - 09/23/09 01:41 AM
Don't try to use the stock springs for any more than stock lift. They are barely adequate for a stock motor when you add a carb and headers. If you want a number I would say .450 , you might be able to sneek out a few more thousands with a flat tappet because it is lighter but then you have to worry about coil bind.
I have a pair of bare aluminum magnums I might sell, PM me if you want some more info.
Posted By: sharpie
Re: Any 360 Magnum users out there? - 09/23/09 02:40 AM
I've had my goods and bads with my Magnum motor, but overall, I like it.
Posted By: patrick
Re: Any 360 Magnum users out there? - 09/23/09 03:55 PM
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Exactly, how much lift can we have using stock springs ?
Dan
.480" at the valve, max from measuring coil bind and IH on my mag heads. but you can't have very aggressive ramps either, as the springs are only like 60lbs seat pressure and 250lb/in rate.
Posted By: joedust451
Re: Any 360 Magnum users out there? - 09/23/09 08:01 PM
Just ordered a set of RHS Magnums from hughes for 875.00, others wanted 6-700.00 for stock reman heads.
Patrick, i called Bullet cams, its 125.00 to re-grind mine, but i can only get around .430-.440 lift, for 199.00, hughes will take mine as a core & put me into a .500 lift. They will give me more lift, but i would have to change the springs.
Posted By: patrick
Re: Any 360 Magnum users out there? - 09/24/09 01:22 PM
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Just ordered a set of RHS Magnums from hughes for 875.00, others wanted 6-700.00 for stock reman heads.
Patrick, i called Bullet cams, its 125.00 to re-grind mine, but i can only get around .430-.440 lift, for 199.00, hughes will take mine as a core & put me into a .500 lift. They will give me more lift, but i would have to change the springs.
the hughes heads come with their 1110 spring package, which should be fine for any of their cams into the .54" lift range.
who did you talk to at Bullet? I worked with Tim. the first guy I talked to said he didn't think they could put much lobe on mine, Tim said that the OEM Chrysler roller cam cores are hardened much deeper than the GM and ford ones
(in the range of .4" deep), so they can get pretty aggressive on a regrind. he had no problem putting the HR259/316 lobe on mine, and it sounded like I could have gone bigger if I had wanted to. I'd call bullet back and ask for Tim and see what he has to say.
Posted By: Intense RT Dan
Re: Any 360 Magnum users out there? - 09/24/09 02:46 PM
I used a friends spring pressure tool, but with 15K miles on Sealed Power stock replacement springs I measured 80 on the seat and 270 open. With .060 shim...85 and 280. Still over .060 cbc.This is measuring at stock installed height, btw.
Posted By: patrick
Re: Any 360 Magnum users out there? - 09/24/09 04:23 PM
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I used a friends spring pressure tool, but with 15K miles on Sealed Power stock replacement springs I measured 80 on the seat and 270 open. With .060 shim...85 and 280. Still over .060 cbc.This is measuring at stock installed height, btw.
.060 shims will give you coil bind at ~.480" lift, so to keep a safe clearance you'd be limited to ~.420" valve lift, or less than the stock 318 mag cam.
Posted By: chache876
Re: Any 360 Magnum users out there? - 10/02/09 04:40 AM
assuming you have the correct valve spring setup, at what point do you need to start working about piston to valve clearance on a stock engine?
Posted By: dodgeboy11
Re: Any 360 Magnum users out there? - 10/02/09 05:23 AM
You need to worry about P to V anytime you cam up. It's duration, rather than lift, that you have to worry about. At max lift the piston's far down the bore, but if the valve hangs open long, it could hit. There's no way to tell what the number is because if you advance or retard the cam, if the valve sizes are larger/smaller than stock, if the valve is sunk in the head, if the head is milled, thinner head gasket, etc. All these things play a part in what your piston to valve clearance will be and that's why nobody can give you more than a ballpark, "I had issues when I got to this large a cam" type of answer.
For what it's worth, I have a '97 magnum 360 in my car. Stock heads were cracked, 7 out of the 8 chambers. Bought Magnum R/T's and put LS6 chevy valves in 'em (I had them) .100" short but the geometry still worked. New pistons and rods, cam is a comp hydraulic roller, 216/224, .501" 114 LSA installed at 109. Was going to be a turbo motor. As is, with 1-5/8" headers and a perf RPM air gap intake it put 294 hp to the ground. Very mild combo. Built it for a truck as a matter of fact.
Shop I work at has a 360 with Edelbrock Mag heads. This one made 488 hp at the flywheel. Cam's a bit bigger than mine though and the heads have been worked over a bit... I like the magnums cause you can run a Chevy rocker arm. Cheaper and simpler. If you want to go crazy you can run T&D's...
Posted By: mike s
Re: Any 360 Magnum users out there? - 10/02/09 05:23 AM
Pro Comp has iron Magnum cyl hds for under $600.00 bare and likely are the same as the RHS cyl head.5.9L has a dished piston so there is a bit of clearance there.The 2.02 int valve is worth about 20 h.p in a slightly modified eng but you do lose some low end torque.350 h.p should be fairly easy to achieve with an int,decent headers,stock cyl hds w/the 2.02 int valve and the stock cam. The 5.9L Max that was schd for the 2000 m.y. made 320 h.p. with tri-y's,an int change,2.02's and the stock cam.The other area of concern is the distance between the bottom of the retainer and the top of the valve guide,very tight.
Posted By: joedust451
Re: Any 360 Magnum users out there? - 10/02/09 06:02 AM
I've heard nightmares about the Procomp heads, bad reviews from the chevy crowd, they say there junk, i went with the RHSs for 875.00 complete from Hughes, they look very nice, & they flow good too with the stock valves.
Posted By: patrick
Re: Any 360 Magnum users out there? - 10/02/09 11:56 AM
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Pro Comp has iron Magnum cyl hds for under $600.00 bare and likely are the same as the RHS cyl head.5.9L has a dished piston so there is a bit of clearance there.The 2.02 int valve is worth about 20 h.p in a slightly modified eng but you do lose some low end torque.350 h.p should be fairly easy to achieve with an int,decent headers,stock cyl hds w/the 2.02 int valve and the stock cam. The 5.9L Max that was schd for the 2000 m.y. made 320 h.p. with tri-y's,an int change,2.02's and the stock cam.The other area of concern is the distance between the bottom of the retainer and the top of the valve guide,very tight.
pro comps are chinese cast heads that actually flow worse than OEM mags. if you want aftermarket mags, start out with the enginequests (cast in NZ) or the RHS's.
hughes has the EQ's advertised with OEM valves, & their 1110 springs for $699/pr assembled, the RHS's set up the same way they have for $175/pr more.
Posted By: HotRodDave
Re: Any 360 Magnum users out there? - 10/02/09 03:18 PM
I have had pretty much all the iron mag heads in my hands and the RHS and pro comp are litteraly the oposite ends of the spectrum. The RHS is the best and the pro-comp is the worst. The RHS has very nice machine work, very nice little touches aimed at improving wet flow, thick ports for lots of improvement, very good casting quality... The pro-comp has tiny ports with very rough castings, the only good thing about it is cheap price and the chamber is significantly smaller so you do get a compression bump.
Posted By: joedust451
Re: Any 360 Magnum users out there? - 10/02/09 09:02 PM
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I have had pretty much all the iron mag heads in my hands and the RHS and pro comp are litteraly the oposite ends of the spectrum. The RHS is the best and the pro-comp is the worst. The RHS has very nice machine work, very nice little touches aimed at improving wet flow, thick ports for lots of improvement, very good casting quality... The pro-comp has tiny ports with very rough castings, the only good thing about it is cheap price and the chamber is significantly smaller so you do get a compression bump.
Thats why i went with the RHSs, i was very surprized at how nice the machineing was, they are heavy too, so there not going to crack anytime soon, plus theres room to port them & get some good #s, but stock they still flow good, those Procomps being around 600.00 bare is not even worth it, by the time you have them assembled with all the hardware, you'll be at what the RHSs cost if you bought everything new, & you still have junky heads, i also found a set off e-bay for 479.00 complete (new) from a place called J&C enterprizes, but luckally i got the scoop on them before i made my purchase.
Posted By: Intense RT Dan
Re: Any 360 Magnum users out there? - 10/02/09 09:25 PM
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I used a friends spring pressure tool, but with 15K miles on Sealed Power stock replacement springs I measured 80 on the seat and 270 open. With .060 shim...85 and 280. Still over .060 cbc.This is measuring at stock installed height, btw.
.060 shims will give you coil bind at ~.480" lift, so to keep a safe clearance you'd be limited to ~.420" valve lift, or less than the stock 318 mag cam.
That's incorrect on stock machined castings. On my OE stock unmachined spring pockets, stock retainers and locks,stock valves, and .060 shims...far from coilbind. This is at .471 gross lift, not counting any deflection, on the exhaust. Lift is .464 on the intake. I measured the cam on a cam doctor. I beat on the engine regularly pulling up to 6k rpms. It starts to float around 5800-5900. I'm still trying to determine best shift rpm from first gear.
I'm running V max roller lifters with .010 lash also. All on stock beehive/shimmed springs.Now, you do have to check and replace them more often.
Posted By: Intense RT Dan
Re: Any 360 Magnum users out there? - 10/02/09 09:39 PM
The EQ heads are great castings, I just wish the RHS heads were available last Dec when I ordered the EQ's. The larger stud boss would have been easier to setup the heads.
I wasn't going to use a 3/8 stud with only a 5/16 base so I drilled and tapped the EQ pedestals for a 3/8 base stud. I used arp studs for a Mark V BBC. 7/16 stud but with 3/8 base. I would have rather had the boss to drill and tap for a 1/2" base stud. The RHS would have allowed that. Guideplates are another problem. The Isky Adjustables holes are too big imo and just a pain in the rear dispite being tig welded. I want more surface area contacting the tiny pedestals of the EQ head. Again, would have that problem if I was using the RHS head. I'll get it sorted out, but I have many many hours developing the ports on these heads and wouldn't look forward to starting over. I think I'll digitize the ports and CNC machine some though when I finish CNC school.
Posted By: joedust451
Re: Any 360 Magnum users out there? - 10/02/09 10:58 PM
I'm just going to run the stock rockers/pushrods for now, possibly even the cam (don't know yet) Tim @ Hughes said i'll be fine with a .503 lift cam on the stock stuff with the 1110 springs.
Posted By: patrick
Re: Any 360 Magnum users out there? - 10/05/09 12:00 PM
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I used a friends spring pressure tool, but with 15K miles on Sealed Power stock replacement springs I measured 80 on the seat and 270 open. With .060 shim...85 and 280. Still over .060 cbc.This is measuring at stock installed height, btw.
.060 shims will give you coil bind at ~.480" lift, so to keep a safe clearance you'd be limited to ~.420" valve lift, or less than the stock 318 mag cam.
That's incorrect on stock machined castings. On my OE stock unmachined spring pockets, stock retainers and locks,stock valves, and .060 shims...far from coilbind. This is at .471 gross lift, not counting any deflection, on the exhaust. Lift is .464 on the intake. I measured the cam on a cam doctor. I beat on the engine regularly pulling up to 6k rpms. It starts to float around 5800-5900. I'm still trying to determine best shift rpm from first gear.
I'm running V max roller lifters with .010 lash also. All on stock beehive/shimmed springs.Now, you do have to check and replace them more often.
just stating what I physically measured with my OEM magnum heads. installed height on the stock, uncut heads and stock springs was 1.62". coil bind height, I measured at 1.1". that's .52" of travel before coil bind on my heads. figure .040" min clearance, that gives you .48" actual lift possible. add in .060 shims, and you have to reduce that by the same .060.
you must have some pretty decently sunk seats to be able to get that much lift with shims and stock parts.