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Hemi intake bolt torque specs

gtx6970

gtx6970

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Putting my intake back on ( yes I switched to all studs ).
A- that way it goes straight down.
B- its easier to torque them accurately.
Is it OK to follow OEM specs / values .

Plus , this way I have close to if not a full inch of thread engagement in the heads . I cut them all from a longer piece of 1/4-20 all thread
72inlbs center
48lnlbs outers

intake1.jpg


intake2.jpg
 
Yes, starting in the center and cris crossing your way out like a head. And you will have to run that pattern many times slowly pulling it down. A dial type or beam type torque wrench is the only thing that will really work. And after you run the engine you'll have to go over it a few more times.
 
All thread on the 4 corners is what I have used to place the intake, then I start all the other bolts. Then I remove the all thread rods and place those bolts. I like to keep the factory look.
 
Ive got them torqued down and have gone over them at least 5 or 6 times so far. Feels like they are settling in.

Once its gone thru a few heat cycles. I'll go over them all again.

I realize the studs aint oem. But I dont care . Im more concerned with getting them all torqued as they should. The OEM hardware will go in the tool box for another day

All the nuts are new and with nice plating. . It looks good, Just not dead nuts OEM.

The final deciding factor to go all studs was no one local had the right Allen socket in 3/8" drive. And I wasn't buying another set to just get the one I needed.
All I had was one of those flip open Allen wrench sets. ( no idea where mine went )
The material to make the studs were less than $10 total and I already had the captive washer nuts on hand from my vendor days.
 
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I left the carbs off and let the gaskets consolidate for several days, re-torquing several times during the day and then a couple of times after installing the carbs and starting it up. Some of the bolts/ nuts are a bit hard to get to with a torque wrench with the carbs on. No idea how many times I re-torqued but probably more than a dozen. The Mancini bolt kit (reproduction) I used had 6 threaded studs and the rest bolts.
 
I have used OEM bolts in the past. I also stud mine as well. I never cared about 100% correct. Sometimes with 60 year old heads and sometimes even bolts. I have pulled threads before and had to helicoil before. Studs are nice with aluminum heads as well.
 
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First, I have never owned a Hemi car.
Retired after 30 plus years as a millwright in a steel mill.

In my experience, hardware store all thread will never hold torque long term.
In use, as things expand, they will stretch, and will not recover.
I wish you luck, but I would make sure not to misplace the originals.
Vacuum leaks can cause many problems, as I’m sure you know.
Just my experience.
 
I agree, I might use some all thread to guide the intake on, but they aren't staying there. Does someone make a stud kit?
 
Just answered my own question, several available.
 
I may go with either one from Mancini. I talked to you in Dubuque last September.
Thanks.
 
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