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Is it worth the swap to magnum heads on my 360 #307883 05/04/09 06:05 PM 05/04/09 06:05 PM
Joined: Apr 2007 Posts: 375 NE Oklahoma 7 71valiant OP enthusiast
71valiant OP enthusiast 7 Joined: Apr 2007 Posts: 375 NE Oklahoma	I have a 360 I built for my valiant. Its got LA heads, 480/480 lift cam, headers, rpm air-gap. etc I just got ahold of a 1999 magnum 5.9 motor out of a Ram. Is it worth it to swap these heads on my motor and what does it take to get them on there?

Re: Is it worth the swap to magnum heads on my 360 [Re: 71valiant] #307884 05/04/09 08:22 PM 05/04/09 08:22 PM
Joined: Apr 2007 Posts: 375 NE Oklahoma 7 71valiant OP enthusiast
71valiant OP enthusiast 7 Joined: Apr 2007 Posts: 375 NE Oklahoma	bump!!!!!

Re: Is it worth the swap to magnum heads on my 360 [Re: 71valiant] #307885 05/04/09 08:35 PM 05/04/09 08:35 PM
Joined: Jan 2005 Posts: 12,423 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,423 Kalispell Mt.	The improvement would be night and day, especially if both heads are stock I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: Is it worth the swap to magnum heads on my 360 [Re: HotRodDave] #307886 05/04/09 09:02 PM 05/04/09 09:02 PM
Joined: May 2003 Posts: 1,527 Michigan G GoDartGo pro stock
GoDartGo pro stock G Joined: May 2003 Posts: 1,527 Michigan	at the risk of sounding like a jack [Edited by Moparts - Keep it clean], why not build the 5.9? Roller lifters, the pistons are matched to the quench in the heads. Get a roller cam for an LA, switch timing covers and drill the heads for the Eddy intake, and if I remeber correctly, a 318 oil pan and pickup. What pistons do you have in the 360 now?

Re: Is it worth the swap to magnum heads on my 360 [Re: GoDartGo] #307887 05/05/09 05:07 AM 05/05/09 05:07 AM
Joined: Apr 2007 Posts: 375 NE Oklahoma 7 71valiant OP enthusiast
71valiant OP enthusiast 7 Joined: Apr 2007 Posts: 375 NE Oklahoma	I just built the older 360. Its got probably 500 miles in it. The 1999 magnum has a spun bearing. I guess I could build it. I dont know if all the asseory brackets from my older motor bolt on it.

Re: Is it worth the swap to magnum heads on my 360 [Re: 71valiant] #307888 05/05/09 08:48 AM 05/05/09 08:48 AM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	what pistons do you have? factory replacement? speed pro h116cp's or KB107's? one thing, mag rockers are 1.6 ratio, so your .480 lift cam becomes a .512" lift. finding valve springs to work with that that don't brake the bank is hard. hughes 1110 springs & matching retainers should work or GM3100 V-6 springs and retainers should too, but it'll be right on the edge. search the Q&A for magnum, lots of good discussion over the past month. 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)

Re: Is it worth the swap to magnum heads on my 360 [Re: patrick] #307889 05/05/09 09:43 AM 05/05/09 09:43 AM
Joined: Jun 2008 Posts: 1,822 Colorado D denfireguy top fuel
denfireguy top fuel D Joined: Jun 2008 Posts: 1,822 Colorado	Quote: what pistons do you have? factory replacement? speed pro h116cp's or KB107's? one thing, mag rockers are 1.6 ratio, so your .480 lift cam becomes a .512" lift. finding valve springs to work with that that don't brake the bank is hard. hughes 1110 springs & matching retainers should work or GM3100 V-6 springs and retainers should too, but it'll be right on the edge. search the Q&A for magnum, lots of good discussion over the past month. If you go with the magnums, drop back to a .444 lift cam and you will be back where you were. Patrick's advice on small blocks is spot on in his posts on this board. Craig 2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado

Re: Is it worth the swap to magnum heads on my 360 [Re: GoDartGo] #307890 05/05/09 11:05 AM 05/05/09 11:05 AM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman pro stock
Wedgeman pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	Quote: at the risk of sounding like a jack [Edited by Moparts - Keep it clean], why not build the 5.9? Roller lifters, the pistons are matched to the quench in the heads. Get a roller cam for an LA, switch timing covers and drill the heads for the Eddy intake, and if I remeber correctly, a 318 oil pan and pickup. What pistons do you have in the 360 now? I am going that route rihgt now......lots of torque from the 5.9 ! Dan

Re: Is it worth the swap to magnum heads on my 360 [Re: patrick] #307891 05/05/09 05:44 PM 05/05/09 05:44 PM
Joined: Apr 2007 Posts: 375 NE Oklahoma 7 71valiant OP enthusiast
71valiant OP enthusiast 7 Joined: Apr 2007 Posts: 375 NE Oklahoma	Yeah I have factory replacment pistons. The cam is 480/480lift... 292/292dur... 109 centerline... 230@.050. I have the comp springs that were suggusted for this cam. Will they work? I dont drive the car on the street if that makes a difference. Its a track toy only. How much will the heads raise my compression with a thin head gasket? Quote: what pistons do you have? factory replacement? speed pro h116cp's or KB107's? one thing, mag rockers are 1.6 ratio, so your .480 lift cam becomes a .512" lift. finding valve springs to work with that that don't brake the bank is hard. hughes 1110 springs & matching retainers should work or GM3100 V-6 springs and retainers should too, but it'll be right on the edge. search the Q&A for magnum, lots of good discussion over the past month.

Re: Is it worth the swap to magnum heads on my 360 [Re: 71valiant] #307892 05/05/09 08:58 PM 05/05/09 08:58 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	Quote: Yeah I have factory replacment pistons. The cam is 480/480lift... 292/292dur... 109 centerline... [Email]230@.050.[/Email] I have the comp springs that were suggusted for this cam. Will they work? I dont drive the car on the street if that makes a difference. Its a track toy only. How much will the heads raise my compression with a thin head gasket? stock 360 heads you're looking at 7.8-8.1 compression depending on gaskets. thin gaskets and mags, you're looking at ~8.5-8.6:1. the LA springs won't have enough lift capacity before coil bind on magnum heads, plus you have to find retainers for them. stock mags (due to beehive springs) are too small. 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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