carbed 360 magnum, cam advice
#1367082
01/09/13 07:49 PM
01/09/13 07:49 PM
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Joined: Jan 2013
Posts: 13
columbus oh
turboking15
OP
member
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OP
member
Joined: Jan 2013
Posts: 13
columbus oh
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First off hello everyone glad to now be a part of the forum.
The motor in question is a 5.9 magnum, .040 over, scat h beams, srp flat tops (142070),.040 thick hg, 2.02-1.65 eq iron heads, light port and polish, m1 single plane, holley 750, 1" open spacer, 1.75" headers 3" collectors
The car is driven on the street but daily driving manners are not my concern, if its a little rowdy im alright with that, i have a boring sheep mobile to drive if i want comfort.
I have been looking at a couple of OTS cams and like the specs on most of them but was also wondering if a combo of a couple cams wraped up into a custom grind would be better? Here are the cams im looking at:
The main one is:
XR280HR 280/288 230/236 .541/.537(@1.5rr i have 1.6) 110* lsa
The next ones wont work due to lifter design but i like some of the specs on them:
XE275HL - 275/287 231/237 .525/.525 110* lsa (1.5rr)
288R - 288/288 243/243 .550/.550 110* lsa (1.5rr)
XR280R - 280/286 242/248 .570/.576 110* lsa (1.5rr)
So my big question is should i go with the xr280hr, a combination of some of the other specs, or am i completely off my rocker and in the wrong direction?
Thanks
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Re: carbed 360 magnum, cam advice
[Re: turboking15]
#1367083
01/09/13 08:10 PM
01/09/13 08:10 PM
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Joined: Nov 2003
Posts: 1,969
Chandler, AZ
Duner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,969
Chandler, AZ
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Quote:
First off hello everyone glad to now be a part of the forum.
The motor in question is a 5.9 magnum, .040 over, scat h beams, srp flat tops (142070),.040 thick hg, 2.02-1.65 eq iron heads, light port and polish, m1 single plane, holley 750, 1" open spacer, 1.75" headers 3" collectors
The car is driven on the street but daily driving manners are not my concern, if its a little rowdy im alright with that, i have a boring sheep mobile to drive if i want comfort.
I have been looking at a couple of OTS cams and like the specs on most of them but was also wondering if a combo of a couple cams wraped up into a custom grind would be better? Here are the cams im looking at:
The main one is:
XR280HR 280/288 230/236 .541/.537(@1.5rr i have 1.6) 110* lsa
The next ones wont work due to lifter design but i like some of the specs on them:
XE275HL - 275/287 231/237 .525/.525 110* lsa (1.5rr)
288R - 288/288 243/243 .550/.550 110* lsa (1.5rr)
XR280R - 280/286 242/248 .570/.576 110* lsa (1.5rr)
So my big question is should i go with the xr280hr, a combination of some of the other specs, or am i completely off my rocker and in the wrong direction?
Thanks
How heavy is your car?
What convertor?
What rear gear?
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Re: carbed 360 magnum, cam advice
[Re: turboking15]
#1367085
01/09/13 10:06 PM
01/09/13 10:06 PM
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Joined: Nov 2004
Posts: 226
lino lakes,MN
onebaddakota
enthusiast
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enthusiast
Joined: Nov 2004
Posts: 226
lino lakes,MN
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What are the spring on the heads? You can't go crazy on the lift with the hyd. roller setup.
10.56 at 125.6, with a 1.43 60 ft.
E85, Hyd. Roller 410 magnum,full exhaust, 3500 race weight.
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Re: carbed 360 magnum, cam advice
[Re: turboking15]
#1367087
01/10/13 12:41 AM
01/10/13 12:41 AM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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If the guides are untouched, you'll be limited to .525 or so at the retainer. I like this one, if there isn't a guide to retainer problem: XR280HR 280/288 230/236 .541/.537(@1.5rr i have 1.6) 110* lsa I would also consider the switch to an Eddy Air Gap intake. 
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Re: carbed 360 magnum, cam advice
[Re: cudadoug]
#1367088
01/10/13 01:36 AM
01/10/13 01:36 AM
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Joined: Mar 2003
Posts: 2,512
PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,512
PA
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I used the XR280HR in my budget pump gas magnum build I just finished in December. I used stock 318 heads. I run 1.6 chevy rockers and bought the comp cams cutter to cut the guides down. Had to cut them a lot to get good retainer to guide clearance. I used the 2.2 retainers and mopar P4876062 springs.
My setup is close to yours at 3300lbs and 3.55 gears and it shows some promise as it run 11.38 @ 118 through full exhaust and a LOT of ET left in it.
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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Re: carbed 360 magnum, cam advice
[Re: turboking15]
#1367090
01/10/13 05:10 AM
01/10/13 05:10 AM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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Quote:
why would you suggest the air gap over the m1?
Did you cut down the spring seats or just the guides? What is your IH and spring pressures? Any idea how much you cut off the guides?
Also do you have a pn on the rocker arms you used?
I feel the Air Gap will make a little more torque down low...
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Re: carbed 360 magnum, cam advice
[Re: moparacer]
#1367091
01/10/13 05:12 AM
01/10/13 05:12 AM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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Quote:
I used the XR280HR in my budget pump gas magnum build I just finished in December. I used stock 318 heads. I run 1.6 chevy rockers and bought the comp cams cutter to cut the guides down. Had to cut them a lot to get good retainer to guide clearance. I used the 2.2 retainers and mopar P4876062 springs.
My setup is close to yours at 3300lbs and 3.55 gears and it shows some promise as it run 11.38 @ 118 through full exhaust and a LOT of ET left in it.
Wow...good info here. But WOW!!!...that runs good. Tell us more about your combo.
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Re: carbed 360 magnum, cam advice
[Re: cudadoug]
#1367092
01/10/13 11:09 AM
01/10/13 11:09 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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don't know about the EQ heads, but stock magnums don't have a lot of meat on the port roof to cut down the spring seats...when I did my magnum 318, I had the valves sunk about .030 on the valve job, and used Hughes #1110 springs and 2.2L retainers/magnum locks. gave me ~1.64"IH and about .54-.5500" of potential lift before getting into spring binding and valve guide clearance concerns. I'd see if bullet cams can regrind your existing stock cam, or grind you a new one. I'd use the HR278/340B lobe for the intake and exhaust. magnums have really good intake/exhaust flow balance and don't really need a split pattern cam. this lobe is 278 deg@.006, 226@.050, 146@.2, and .340" lobe lift (.544" with 1.6 ratio rockers). for comparison, the flat tappet comp XE275HL is 275 adv, 230@.050, and 149@.2" lobe lift.... http://bulletcams.com/Masters/HRlobes.htmand an RPM air gap intake will get you another 20ft-lbs of torque down low compared to the M1 single plane, and should match it power wise up to 5500-6000 RPM
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: carbed 360 magnum, cam advice
[Re: turboking15]
#1367094
01/11/13 09:37 AM
01/11/13 09:37 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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if you have good tight quench (.030-.045") it should run on pump 92 with the cam I suggested. may have to limit advance a bit, but my mag headed 318 ran best with only 30 degrees total timing, thanks to the efficient chamber
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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