Re: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: erick72]
#280842
04/13/09 08:26 AM
04/13/09 08:26 AM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
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any aftermarket cam will have the pushrod oiling lifters except maybe mopar performance ones. everyone else (comp, crane, summit, lunati) lists the same lifters for AMC and chrysler.
w/o decking or new pistons, with the mag heads and stock LA shortblock, if you use the think Mr. gasket/MP head gaskets (.028" thick) and your mag heads are stock 63ccish chambers, you'll be at about 8.6-8.7:1 compression.
decking will most likely be more expensive than the cost of the pistons, but then, you probably would want to actually get the block bored if you're buying new slugs.
I'd be leery of even that much lift on stock mag valve springs. remember, on the magnum engine that will be .470/.470 lift. I'd use the GM 3100 springs/retainers with that 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: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: patrick]
#280844
04/13/09 01:48 PM
04/13/09 01:48 PM
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Joined: Jul 2008
Posts: 580 Detroit,Michigan USA!
erick72
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Quote:
any aftermarket cam will have the pushrod oiling lifters except maybe mopar performance ones. everyone else (comp, crane, summit, lunati) lists the same lifters for AMC and chrysler.
w/o decking or new pistons, with the mag heads and stock LA shortblock, if you use the think Mr. gasket/MP head gaskets (.028" thick) and your mag heads are stock 63ccish chambers, you'll be at about 8.6-8.7:1 compression.
decking will most likely be more expensive than the cost of the pistons, but then, you probably would want to actually get the block bored if you're buying new slugs.
I'd be leery of even that much lift on stock mag valve springs. remember, on the magnum engine that will be .470/.470 lift. I'd use the GM 3100 springs/retainers with that cam.
how mch horse you think i can get?
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Re: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: erick72]
#280845
04/13/09 01:57 PM
04/13/09 01:57 PM
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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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that cam w/1.6 rockers will end up having specs in .050 duration and lift similar to a comp XE262. dulcich made 335hp/400tq with a stock long block 360 from the early 80's, hooker headers, and a comp XE262. see article: http://compcams.com/Community/Articles/Details.asp?ID=-409383413with the mag heads giving slightly better flow, more velocity, and 3/4 of a point higher compression, I'd probably put the motor in the 350-355HP/410-420tq range as long as the bottom end is in good shape with good ring seal.
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: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: erick72]
#280847
04/13/09 02:47 PM
04/13/09 02:47 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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Patrick I had the heads milled here for him .030 but I was getting ready to CC them after that and dropped my beaker(glass). I just did a tad bit of a bowl clean up and opened the PR pinch a few thou on either side. I would think he would be OK with the stock springs and that small of a cam becasue the liftes are so much lighter than the stock rollers. Mabey I am wrong
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: erick72]
#280849
04/13/09 03:04 PM
04/13/09 03:04 PM
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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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comp XE262 is 262/270 adv, 218/224 .050, .462/.470 lift, 110 LSA, 46 degrees overlap.
the summit K6901 (with magnum 1.6 ratio rockers) is 276/286 adv, 218/228 .050 duration, .470/.470 lift, 114 LSA, 53 degrees overlap
since .050 duration is near identical, these cams should have similar RPM ranges. the 114 LSA of the summit cam might sacrafice a little low end/midrange torque and carry the powerband slightly higher. the additional 7 degrees of overlap should make the idle lumpier. similar .050 duration and lift numbers mean they should make similar power, if head flow is similar.
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: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: patrick]
#280850
04/13/09 03:11 PM
04/13/09 03:11 PM
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Joined: Jul 2008
Posts: 580 Detroit,Michigan USA!
erick72
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mopar
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OP
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Quote:
comp XE262 is 262/270 adv, 218/224 .050, .462/.470 lift, 110 LSA, 46 degrees overlap.
the summit K6901 (with magnum 1.6 ratio rockers) is 276/286 adv, 218/228 .050 duration, .470/.470 lift, 114 LSA, 53 degrees overlap
since .050 duration is near identical, these cams should have similar RPM ranges. the 114 LSA of the summit cam might sacrafice a little low end/midrange torque and carry the powerband slightly higher. the additional 7 degrees of overlap should make the idle lumpier. similar .050 duration and lift numbers mean they should make similar power, if head flow is similar.
so in ther words the cam is fine then?
thanks patrick in advance for your help.
and you too hotroddave!
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Re: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: patrick]
#280851
04/13/09 03:24 PM
04/13/09 03:24 PM
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Joined: Jul 2008
Posts: 580 Detroit,Michigan USA!
erick72
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Quote:
that cam w/1.6 rockers will end up having specs in .050 duration and lift similar to a comp XE262.
dulcich made 335hp/400tq with a stock long block 360 from the early 80's, hooker headers, and a comp XE262.
see article: http://compcams.com/Community/Articles/Details.asp?ID=-409383413
with the mag heads giving slightly better flow, more velocity, and 3/4 of a point higher compression, I'd probably put the motor in the 350-355HP/410-420tq range as long as the bottom end is in good shape with good ring seal.
oh yeah idk if you noticed but you know they made 335 horse with a block bored 40 over.
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Re: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: erick72]
#280852
04/13/09 03:46 PM
04/13/09 03:46 PM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
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the overbore will add 7 cubic inches. it won't really affect power at all, maybe 1-2% at most over a similarly built standard bore engine
condition of the bores (are they round? tapered?), and ring seal quality will have a larger effect on power than .040" more bore will
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: NEW DIRECTION IN THE 318 BUILD!Getting a 360
[Re: patrick]
#280853
04/13/09 11:49 PM
04/13/09 11:49 PM
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Joined: Jul 2008
Posts: 580 Detroit,Michigan USA!
erick72
OP
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OP
mopar
Joined: Jul 2008
Posts: 580
Detroit,Michigan USA!
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Quote:
the overbore will add 7 cubic inches. it won't really affect power at all, maybe 1-2% at most over a similarly built standard bore engine
condition of the bores (are they round? tapered?), and ring seal quality will have a larger effect on power than .040" more bore will
idk yet.waiting till friday to look.
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