360 Magnum build questions
#981053
04/26/11 07:23 PM
04/26/11 07:23 PM
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Joined: Apr 2006
Posts: 209
Carlisle, AR.
mdwyer
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Carlisle, AR.
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Stock 360 magnum going into 72 satellite.
Stock 360 mag (1997)
Eddie RPM air gap
72 340/ 360 mainfolds
Air conditioning
4 speed (truck 833 o/d)
8 3/4 3.73
255/60/15 tire
Give me some ideas for cam (rerind) and carb.
looking for mileage and cruise. No drag racing.
thanks,
mike
1970 Challenger T/A
1970 Roadrunner RM21 Vcode
1971 Gtx
1971 Satellite
1971 Charger 500 GB5 383 A54 car
1972 Satellite
1997 Dodge 1500 hunting rig
2014 Ram 2500 Mega Cab
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Re: 360 Magnum build questions
[Re: mdwyer]
#981054
04/26/11 08:01 PM
04/26/11 08:01 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Stock 360 magnum going into 72 satellite.
Stock 360 mag (1997)
Eddie RPM air gap
72 340/ 360 mainfolds
Air conditioning
4 speed (truck 833 o/d)
8 3/4 3.73
255/60/15 tire
Give me some ideas for cam (rerind) and carb.
looking for mileage and cruise. No drag racing.
thanks,
mike
If your not looking for top perf., but more gas mileage, I would get the reg. perf. with the heat crossover over the RPM air gap, then run a TQ, I'm sure some are going to disagree, but i will tell you the magnum engine will have plenty of power, If you want a regrind, don't go crazy, You may just want to run the engine just the way it is with the stock cam & a set of 3.23s, this will make for better mileage & less hassle, I'm sure it'll still run good, just drop on the intake/carb & dist.
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Re: 360 Magnum build questions
[Re: mdwyer]
#981055
04/26/11 09:08 PM
04/26/11 09:08 PM
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Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
Prince_Valiant
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
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Probably just stick with the same cam...I used a stock magnum w/ eddy air-gap (same as performer rpm), MP ignition, 79 truck manifolds, eddy 600 carb...plenty strong as configured. best mileage taking it easy was 17mpg in the little red truck. Best quarter was 15.1 @ 91mph...not too shabby for a 3.55 geared truck. The only thing was it sounded like a docile little 318 truck of course was really done at 4700rpm. For a reground cam, I went with Hughes 218/228 @ .050 on a 106 LSA, installed on a 103 degree centerline...had a very nice (lumpy) idle, very strong mid range w/ a nice pull up to 5500rpm...mileage wasn't really much if any worse. I've got the cam lying around as I'm upgrading to an AL headed 408 magnum and it'd probably work well with the 3.73 gears. Never ran it at the track or got mileage numbers...but seat of the pants was dramatic (also did heads, carb, and headers at the same time...but it's safe to say it's mileage was similar and was perhaps a 13 second truck). If I ever sell the truck, I'll probably swap in another magnum with this cam as it's really was a nice sounding/performing unit. Got 14 inches of vacuum. If mileage is paramount, I mostly agree with joedust451...though I'd be open to keeping the intake if you've already got it, and invest in 3.23's...it's kind of nice to cruise at 65mph at only 2000 rpm 
1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500
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Re: 360 Magnum build questions
[Re: Prince_Valiant]
#981056
04/27/11 12:58 AM
04/27/11 12:58 AM
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Joined: Apr 2006
Posts: 209
Carlisle, AR.
mdwyer
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Carlisle, AR.
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thanks guys I figured as much on the cam, will call Hughes and Bullet to see some basic profiles. would like to run a thermoquad but this intake can't take it so a square bore carb is it. The intake is the only one I have for a magnum. 3.73 gears and .73 od should put me about 2200 at 70 mph with a 255/60/15. This will be close to a daily driver. Sounds like I'm in for a cheap build, that always scares me 
1970 Challenger T/A
1970 Roadrunner RM21 Vcode
1971 Gtx
1971 Satellite
1971 Charger 500 GB5 383 A54 car
1972 Satellite
1997 Dodge 1500 hunting rig
2014 Ram 2500 Mega Cab
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Re: 360 Magnum build questions
[Re: joedust451]
#981058
04/27/11 08:20 AM
04/27/11 08:20 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
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Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
Stock 360 magnum going into 72 satellite.
Stock 360 mag (1997)
Eddie RPM air gap
72 340/ 360 mainfolds
Air conditioning
4 speed (truck 833 o/d)
8 3/4 3.73
255/60/15 tire
Give me some ideas for cam (rerind) and carb.
looking for mileage and cruise. No drag racing.
thanks,
mike
If your not looking for top perf., but more gas mileage, I would get the reg. perf. with the heat crossover over the RPM air gap, then run a TQ, I'm sure some are going to disagree, but i will tell you the magnum engine will have plenty of power, If you want a regrind, don't go crazy, You may just want to run the engine just the way it is with the stock cam & a set of 3.23s, this will make for better mileage & less hassle, I'm sure it'll still run good, just drop on the intake/carb & dist.
that would be an effort in futility, the performer flows way worse and is at best equal to a stock LA 4bbl intake as far as power, and a magnum doesn't have heat crossover passages in the heads anyway.
I'm very, very satisfied with my reground cam from bullet. I used their HR259/316 lobe for both intake and exhaust in my mag headed 318. I am running chrysler 2.2L/2.5L retainers from a junkyard, and hughes #1110 springs.
for mileage AND power, go for as little overlap, as much .050, .2 duration, and lift as possible....my cam is a reground LA roller on the stock (LA) LSA of 112, installed at 108. IIRC the magnum has a 2 degree wider LSA.
run headers, they'll be worth more than 20hp/20 lb-ft of torque
Last edited by patrick; 04/27/11 08:32 AM.
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 Magnum build questions
[Re: patrick]
#981059
04/27/11 11:32 AM
04/27/11 11:32 AM
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Joined: Apr 2006
Posts: 209
Carlisle, AR.
mdwyer
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Carlisle, AR.
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Patrick,
I plan on running 1110 springs and have some 2.5 retainers.
trying to stay away from headers but it is an option. I have a pair.
looking for good power in the cruise rpm
car does have a/c and power brakes.
would a LA roller cam regrind give me anything more? or stick with bullets magnum regrinds?
I have both.
thanks,
mike
1970 Challenger T/A
1970 Roadrunner RM21 Vcode
1971 Gtx
1971 Satellite
1971 Charger 500 GB5 383 A54 car
1972 Satellite
1997 Dodge 1500 hunting rig
2014 Ram 2500 Mega Cab
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Re: 360 Magnum build questions
[Re: patrick]
#981060
04/27/11 11:32 AM
04/27/11 11:32 AM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
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I Live Here
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Kalispell Mt.
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I would run a single pattern cam with around 208 or 210 duration @.050 and try to get around .480 lift and run about 110 or 112 LSA. Run some GM 3100 V6 springs and retainers. The air-gap intake will be just fine with an adapter and a t-quad.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 Magnum build questions
[Re: mdwyer]
#981061
04/27/11 02:55 PM
04/27/11 02:55 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
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Grand Haven, MI
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Quote:
Patrick,
I plan on running 1110 springs and have some 2.5 retainers.
trying to stay away from headers but it is an option. I have a pair.
looking for good power in the cruise rpm
car does have a/c and power brakes.
would a LA roller cam regrind give me anything more? or stick with bullets magnum regrinds?
I have both.
thanks,
mike
the LA cam, if from an M body will have a long snout for a fuel pump eccentric...that is about it's only real advantage.
my cam pulls 17 inches of vacuum at an 850 RPM idle, drops to ~700 and 13-14" in gear.
my 3950 lb 5th ave has been averaging 17-18.5mpg in mixed driving with my mag headed 318 with this cam, an A500 tranny, 3.55's and 27" tall tires.
engine combo is:
stock 86 short block
home ported magnum heads
aforementioned cam
1406 edelbrock 600cfm carb
eddie RPM air gap
summit 1 5/8" full length headers.
pulls real strong from ~1500-5500 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: 360 Magnum build questions
[Re: 360view]
#981063
04/28/11 10:45 AM
04/28/11 10:45 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
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Grand Haven, MI
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Quote:
For MPG
the stock factory 1994-1996 360 cam
is close to the best you can do,
really? it's got a lot of seat duration, and low lift...I'd think you'd do better to minimize seat duration and overlap, while maximizing lift and mid-lift duration...
http://bulletcams.com/Masters/HRlobes.htm
the stock 360's cam profile is similar to their HR258/250 lobe. I'd think you'd improve power and economy by going with say their HR252/320 lobe, which has 6 degrees less seat duration, but a whopping 22 degrees more .2" lobe lift duration.
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 Magnum build questions
[Re: patrick]
#981064
04/28/11 11:24 AM
04/28/11 11:24 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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If I was picking a cam strictly for mpg out of those bullet lobes I would make it a single pattern Hr231. Should make more MPG and TQ than the stock cam so it can pull a super high gear like a 2.45 or even 2.20 and that combo will really get good MPG. I bet if you built that motor with tight quench, that cam and that gear ratio you could get 30 mpg from a 318. I would use the stock magnum pistons and mill the block to zero deck them, that way you have no valve releifs like a KB167 that could interfere with flame travel or give a crevice volume that is useless.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 Magnum build questions
[Re: patrick]
#981065
04/28/11 11:38 AM
04/28/11 11:38 AM
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Joined: Apr 2006
Posts: 209
Carlisle, AR.
mdwyer
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Carlisle, AR.
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thanks guys Patrick i will call John At bullet and see what he says. 259/316 or 259/326 or 252/320 My car weight and options are close to yours current build reringed 360 (deck trued) home ported mag heads (gasketmatched cleaned up not hogged out) deck cut how much??  1110 hughes springs / 2.5 retainers mp electronic kit 1406 eddie carb or 3310 holly carb Eddie RPM airgap Headers or ported mainfolds(71-73 340)???? 3.73 8 3/4 833 o/d (.73 final) 255/60/15 looking like a good driver combo. mike
1970 Challenger T/A
1970 Roadrunner RM21 Vcode
1971 Gtx
1971 Satellite
1971 Charger 500 GB5 383 A54 car
1972 Satellite
1997 Dodge 1500 hunting rig
2014 Ram 2500 Mega Cab
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Re: 360 Magnum build questions
[Re: mdwyer]
#981066
04/28/11 12:14 PM
04/28/11 12:14 PM
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Joined: Apr 2006
Posts: 209
Carlisle, AR.
mdwyer
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Rethinking gear ratios
3.23 27 inch tire 2250 rpm @ 75 mph
3.55 27 inch tire 2450 rpm @ 75 mph
3.73 27 inch tire 2575 rpm @ 75 mph
3.91 27 inch tire 2750 rpm @ 75 mph
what cam would you use for these? A/C & power brakes
Dave I will get as much quench as I can. Going to measure the 3 blocks for taper and deck height and go from there.
Patrick 1110 springs require NO machining correct? they are drop on?
thanks,
mike
1970 Challenger T/A
1970 Roadrunner RM21 Vcode
1971 Gtx
1971 Satellite
1971 Charger 500 GB5 383 A54 car
1972 Satellite
1997 Dodge 1500 hunting rig
2014 Ram 2500 Mega Cab
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Re: 360 Magnum build questions
[Re: patrick]
#981069
04/28/11 01:17 PM
04/28/11 01:17 PM
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Joined: Apr 2006
Posts: 209
Carlisle, AR.
mdwyer
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Currently have a set of each. I am currently thinking 3.55 or 2nd choice 3.23 259/316 profile 1110 springs eddie RPM airgap eddie 1406 340 mainfolds zero deck block (stock pistons) lightly ported heads  time to head off to the machine shop.  thanks, mike
1970 Challenger T/A
1970 Roadrunner RM21 Vcode
1971 Gtx
1971 Satellite
1971 Charger 500 GB5 383 A54 car
1972 Satellite
1997 Dodge 1500 hunting rig
2014 Ram 2500 Mega Cab
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Re: 360 Magnum build questions
[Re: mdwyer]
#981070
04/28/11 04:12 PM
04/28/11 04:12 PM
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Joined: Jan 2006
Posts: 8,162
USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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Quote:
Stock 360 magnum going into 72 satellite.
Give me some ideas for cam (regrind) and carb.
looking for mileage and cruise. No drag racing.
thanks,
mike
If the 'No drag racing'
is true,
and MPG
and cruise performance
(higher potential torque at low rpm so that the engine 'feels so strong it doesn't need to downshift on the highway)
then we want:
Good gas velocity past the ring shaped valve annulus opening,
even at part-throttle when flow is way below maximum.
If the gas velocity is kept in the 230 to 290 mph range by being squeezed into the right area, then the 'momentum' of the gas will cause it to keep flowing into the cylinder even past bottom dead center.
This builds torque at low rpm
(Yes, near redline rpm it will be restricting flow)
We want good swirl at part throttle,
which is also enhanced by low lift
which 'shrouds' the valve opening more
and makes the air flow curve
as it enters the cylinder.
{this is also why the stock 'heart shaped' Magnum combustion chamber has that 'point' between the intake and exhaust valve seat... it guides the air flow into swirl)
We also want little reversion during overlap
These factors will help for part-throttle MPG
and as the vehicle hits hills
or wants to pull out and pass
this will also help create the most torque
in the 1700 to 2300 rpm range.
This calls for low intake valve lift
so that gas velocity stays high
and swirl helps create fast burn.
This can be confirmed by looking at
current year Chrysler practice
since the newest version 5.7 Hemi has
VVT (variable valve timing)
so a little searching will find out what
reduced durations, overlap and seat timing
are now set by the PCM
for part-throttle
and 1700 - 2300 rpm.
Soon we will be able to see what
valve lift reductions
the Fiat Multi-Air system
commands to be set for low rpm
If the engine was to be drag raced
the camshaft choices would be completely different.
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