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12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

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  #1  
Old 01-08-2011, 02:45 PM
zdanman's Avatar
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Question 12 VALVE HEAD BOLT TORQUE

Correct me if I'm wrong but I haven't seen any detailed threads on re-torquing the 12 valve head bolts down to handle more boost which I'm looking into as I build up the engine a little.

Here's a good article I read online from diesel power mags you can read here on torquing the bolts down. They give 2 methods of doing it and warn the reader of torquing the bolts down more than 120 ft-lbs.

The article states the Factory Cummins torque spec is around 115 ft-lbs.
However - my Chilton manual gives the stock torque spec as
66 ft-lbs +1/4 turn for the short head bolts and 90 ft-lbs +1/4 for the long head bolts.
So....


My Question: Does anyone else have experience with this? What's the true factory specs and what specs can you push the stock bolts too?

Thanks

zdanman's Sig:98 12v Cummins 4x4, 2.5" Level Kit, 315/75/16 Grabber A/T2s, 90 HP 7x9 SDX Injectors, #100 Fuel Plate ff, Starwheel ff, K&N intake, Banks intake manifold, 4" full MBRP exhaust with dual turnout stacks, 17* timing, Billet input shaft, Billet TC, Custom Rebuilt 47RE, BD Adjustable Wastegate (tuned @ 35psi), TC Lockup System, Kenwood head + 600W Alpine amp + 2 x Alpine 12s, Head Bolts at 120 ft/lbs
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  #2  
Old 01-08-2011, 03:12 PM
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Default 12 VALVE HEAD BOLT TORQUE

I've always replaced the head bolts cause all ur gunna wind up doing is streaching them or break them. I just pulled the head off mine cause of to much boost. I'm going back with head studs and a better head gasket. Stock bolts and gasket are designed for no more than 42psi I think
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Old 01-08-2011, 05:28 PM
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i would pull one and measure it to make sure it is not stretched already. then i would re torque them to 150 if there not stretched.... or just get some studs

monster12valve's Sig:SOLD! 94' 2500 4x4, 5"mbrp to 8in black stack , bhaf, no plate, afc tune, isspro gauges, 4k gsk, 60lb VS, ATS intake manifold, tc lock up switch, 5x14's, 191 dv's, single disk, shift kit.
2007 powerstroke, cc,sb 4x4. stockish
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Old 01-09-2011, 12:49 AM
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How much timing and boost do you want to run?

Pyro690's Sig:97 Cummins 12v w/ a Dodge 2500, X cab, 4x4, NV4500, Flat bed, KDP tabbed, Autometer Boost/pyro gauges, 100 fuel plate, 4" Diamond Eye exhaust, 4GSK, SDX IIs
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Old 01-09-2011, 06:47 AM
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@ Pyro690

40 psi
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Old 01-09-2011, 09:19 AM
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diesel power mag a few months back there is a truck built maximum diesel thats rund 600hp on twins and runs 11's with re-torqued stock head bolts torqued to 150 lbs. not saying i recommend this. just couldnt believe it when i was reading it.
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Old 06-01-2011, 05:35 PM
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Originally Posted by monster12valve View Post
diesel power mag a few months back there is a truck built maximum diesel thats rund 600hp on twins and runs 11's with re-torqued stock head bolts torqued to 150 lbs. not saying i recommend this. just couldnt believe it when i was reading it.
...and it probably blew the headgasket the next time they started it.. haha.
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Old 06-01-2011, 10:16 PM
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The 98 FSM says to torque all bolts to 66, then torque only the long ones to 89, and then an additional 90* on all.

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Old 06-01-2011, 11:36 PM
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I would re torque to 130 if they will hold and if you can get more, go for it.

BRE's Sig:[SIGPIC][/SIGPIC]
94 2 wheel drive regular cab 12 valve-5 speed.
Little fuel, little bigger squiters, small air pusher, and just a little timing.
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  #10  
Old 06-02-2011, 09:06 AM
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i use fel-pro head gasket print-o-seal
set torque at 100
run 35 lbs boost
in 5yrs i have blown 1 gasket
i dont see how you can run studs in the back of motor due to room the only way i can get pushrods in on #6 is to remove crossmember and let tranny hit the ground
still have to fight to get them in

dshane62's Sig:95 dodge 3\4 ton w\2002 cummins recon, auto to standard 5 spd. p-pump maxed .
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100 gal. aux. fuel tank, runs 100% bio-diesel make myself for .79 cents a gal.
can also heat & run veggie oil. 3.54 gears rebuilt, timing +15
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