moe,
would it be a bad thing if i used grade 8 for the manifold bolts?

 

YES. a hardened bolt will strip the casting out. best to use grade 2, it will strip the BOLT and leave the holes in the casting. so you can pick the metal out of the hole, and still be able to use the hole. it may be hard to find a grade 2. you may have to use a grade a 3 or 5. but DONT use a grade 8. a bit of history, the slant 6 had very long manifolds that tended to warp. the recommended torque was 10 ft lbs. this let the manifold flex but still seal.

 

im just gonna stick with grade 5, as the left side is already installed with it.. used an electric impact to send them home, but backed em off and re tightened them with a standard 3/8" drive ratchet.. as to not over torque them.. but if you say 10lb ft, then so be it.. cant find sh*t in the FSM as to a torque spec on them..

my issue now is getting the 2 snapped studs out. i broke a bit in one, and an easy out on the other one.. im about to drill em out all together, and tap it for 3/8"... if possible..

 

i was not saying YOUR manifold is 10 lbs. i dont know what the small block mopar ext manifold is. the big block 1967 is 30 lbs on a 3/8 bolt, sounds like a lot. iam sure the small block is a little less. i dont want to guess what the small block is. new info. i found a place that says 30 lbs. sounds like to much to me i would use NO more than 25, 20 would be better. reff. http://boxwrench.net/specs/schrys_A.htm the grade 5 will be fine

 

25 foot pounds Wes. From the FSM, page 9-115.

That was on a 3.9, right?

 

thanks dan.. this truck is gonna kill me... haha but seriously, im gonna eventually need help.. most of my friends arent exactly useful... i gotta find someone that can help me with body work, i dont care if its sheet metal held on there with pop rivets.. as far as im concerned, it has to work 100% not look it, seeing its gonna get beat to hell being used for regional shipping.. i mean my ulitmate goal is to make it like factory new, but ill settle for it looking like its clean but beaten

 

Ha ha yea friend’s help is usually spotty at best most come just to watch have a beer and any free food. Or at the very last minute they can’t do it sorry I need to go to the store never fails

 

I had the exact same problem when replacing the exhaust manifold on my '98 3.9 - one of them snapped off.

We tried pb blaster, and even some 'cryo-spray' but neither worked.

In the end, we got it out by drilling out the body of the stud, so all that was left was the threads, and pulled them out, then cleaned out the female thread with a tap.

 

knowing that the holes are tapped for a 5/16"x18 bolt, i would use a bit just smaller than 5/16?

well not to knock that, but im still thinkin of just drillin em out and retapping for 3/8"x16... can anyone see a possible issue arising from doing that?

 

haha right, well most of my friends come to help but then they just get too stoned to be useful, where as i went thru my ASE training constantly high... do i care? no... its 2013, time to grow the fck up. people smoke pot.. who freakin cares? i will atest to its effects on me, it makes me focus, concentrate, and allows me to problem solve from out side the box... (my feelings on the issues of marijuana use in this country... beating a dead horse, its gonna happen... just let it)