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Re: Any 360 Magnum users out there?
[Re: Intense RT Dan]
#472298
09/24/09 12:23 PM
09/24/09 12:23 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
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.
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: Any 360 Magnum users out there?
[Re: chache876]
#472300
10/02/09 01:23 AM
10/02/09 01:23 AM
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Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
dodgeboy11
super stock
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super stock
Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
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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...
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Re: Any 360 Magnum users out there?
[Re: chache876]
#472301
10/02/09 01:23 AM
10/02/09 01:23 AM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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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.
Leave the gun.......take the Cannoli's....Mike
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Re: Any 360 Magnum users out there?
[Re: mike s]
#472303
10/02/09 07:56 AM
10/02/09 07:56 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
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.
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: Any 360 Magnum users out there?
[Re: patrick]
#472304
10/02/09 11:18 AM
10/02/09 11:18 AM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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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.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Any 360 Magnum users out there?
[Re: HotRodDave]
#472305
10/02/09 05:02 PM
10/02/09 05:02 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
OP
super gas
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OP
super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
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.
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Re: Any 360 Magnum users out there?
[Re: patrick]
#472306
10/02/09 05:25 PM
10/02/09 05:25 PM
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Joined: Sep 2009
Posts: 172
Mooresville, NC
Intense RT Dan
member
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member
Joined: Sep 2009
Posts: 172
Mooresville, NC
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Quote:
Quote:
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.
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Re: Any 360 Magnum users out there?
[Re: Intense RT Dan]
#472309
10/05/09 08:00 AM
10/05/09 08:00 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
Quote:
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.
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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