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magnum intake bolt spec from chrysler? #930941 02/17/11 10:26 AM 02/17/11 10:26 AM
Joined: Sep 2004 Posts: 2,091 oberlin, Ohio Rapid340 OP top fuel
Rapid340 OP top fuel Joined: Sep 2004 Posts: 2,091 oberlin, Ohio	Anyone know the factory intake manifold bolt torque spec for the 5.2/5.9L magnum intake manifold (twelve 5/16 bolts)? One source I found indicated 72 in/lb, that sounded light to me. Thanks 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: magnum intake bolt spec from chrysler? [Re: Rapid340] #930942 02/17/11 10:41 AM 02/17/11 10:41 AM
Joined: May 2006 Posts: 1,260 New Mexico A Adobedude pro stock
Adobedude pro stock A Joined: May 2006 Posts: 1,260 New Mexico	It is lite, 12 ft lbs. Use the factory torque procedure to get there too. Some say you have to use the factory torque to yield bolts, I've just used SS bolts for years. Oh yeah...5/16-18 x 2 1/4" long Last edited by Adobedude; 02/17/11 10:43 AM. 2001 Dodge Dakota 408 All Motor 11.27 @ 117.83 mph 2017 NM Mopar Challenge Series Champion.

Re: magnum intake bolt spec from chrysler? [Re: Adobedude] #930943 02/17/11 10:44 AM 02/17/11 10:44 AM
Joined: Sep 2004 Posts: 2,091 oberlin, Ohio Rapid340 OP top fuel
Rapid340 OP top fuel Joined: Sep 2004 Posts: 2,091 oberlin, Ohio	Is the torque procedure different than LA intake? 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: magnum intake bolt spec from chrysler? [Re: Adobedude] #930944 02/17/11 10:56 AM 02/17/11 10:56 AM
Joined: Nov 2003 Posts: 1,969 Chandler, AZ Duner top fuel
Duner top fuel Joined: Nov 2003 Posts: 1,969 Chandler, AZ	Quote: It is lite, 12 ft lbs. Use the factory torque procedure to get there too. Some say you have to use the factory torque to yield bolts, I've just used SS bolts for years. Oh yeah...5/16-18 x 2 1/4" long Specs? Torque procedure? I just bolt it down and go. ;>)

Re: magnum intake bolt spec from chrysler? [Re: Rapid340] #930945 02/17/11 11:31 AM 02/17/11 11:31 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	you torque them to 72" pounds then down to 144" pounds which = 12 foot pounds on the stock barrel/keg intakes IIRC it starts in the middle and works its way out sorta like an LA intake I do know that it is ez to have coolant leak into the oil if over torqued good luck

Re: magnum intake bolt spec from chrysler? [Re: scratchnfotraction] #930946 02/17/11 12:01 PM 02/17/11 12:01 PM
Joined: Sep 2004 Posts: 2,091 oberlin, Ohio Rapid340 OP top fuel
Rapid340 OP top fuel Joined: Sep 2004 Posts: 2,091 oberlin, Ohio	Quote: I do know that it is ez to have coolant leak into the oil if over torqued That was my reason for asking. If you look at the vertical bolt design there is potential to put huge lifting forces on the heads (compromising head seal). You are essentialy driving a wedge between both heads. As the aluminum intake heats up those forces increase. I just did a SB with magnum heads and had an incorrect torque spec (35 ftlb), I think this could be the reason why there is some coolant weeping on one head. An intake re-install with head re-torque will be needed. Also a quick note for anyone looking at buying a magnum intake, the chinese air gap intake used on this motor was not machined correctly on the intake surfaces (wrong angle) or the valley end seal surfaces (interfered with block). This was the first time I actually used one and not sure I will again. 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: magnum intake bolt spec from chrysler? [Re: Rapid340] #930947 02/17/11 12:40 PM 02/17/11 12:40 PM
Joined: Mar 2005 Posts: 2,489 Pacifica, CA Devilbrad top fuel
Devilbrad top fuel Joined: Mar 2005 Posts: 2,489 Pacifica, CA	This is for the Magnum M1 intake, specs are same for stock manifold.

Re: magnum intake bolt spec from chrysler? [Re: Rapid340] #930948 02/17/11 01:24 PM 02/17/11 01:24 PM
Joined: Jan 2003 Posts: 17,841 S.E. Michigan ZIPPY I Live Here
ZIPPY I Live Here Joined: Jan 2003 Posts: 17,841 S.E. Michigan	Quote: You are essentialy driving a wedge between both heads. Yes! I'll add.... Anyone ever seen a 5.2 or 5.9 block split in half, right down the middle? I've seen three. Anyone ever seen a 5.0 or 302 block split in half, right down the middle? I've seen like two dozen. Same intake bolt setup. Coincidence? Nope, don't think so. The wedge tries to force the heads apart, overtorque it and then run it real hard + maybe add a little boost, and it makes one hell of a mess.... They're all great engines in their own right, but that bolt arrangement is not the hot setup... Rich H. Esse Quam Videri

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