Porting and Polishing Experience
I went with the ARP studs and recommend them, however, ARP listed only 70 ft pounds of torque for our 4.6 motors, whereas the Atlantic youtube video used 85 ft pounds on them.
i used their precision torque grease and installed them at 81 ft pounds. My gut feel was that 85 ft pounds was too close to the limits of the aluminum block threads.
No problems at 81. JB Weld on a head?! Ummm...
i used their precision torque grease and installed them at 81 ft pounds. My gut feel was that 85 ft pounds was too close to the limits of the aluminum block threads.
No problems at 81. JB Weld on a head?! Ummm...
What is your thought process going to 81? L8 said 80, AB 85 and ARP 70. I’m leaning towards ARP’s 70
Camel Trophy
Joined: Aug 2014
Posts: 4,743
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From: Southwestern Virginia
P38 came stock with "tubular manifolds" aka shorty headers. I looked into using a set at one point but ioted for the long tubes. Just an idea, that may not be your perfect solution.
Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Not all that uncommon. Mopar guys totally fill their push rod a intake manifold bolt holes with epoxy so they can re-drill them at an offset so they can port their heads out bigger.
Great thought, but I looked them up and unfortunately I don’t have the facilities to fab them in.
Last edited by CollieRover; Apr 29, 2018 at 12:59 PM.
Recovery Vehicle
Joined: Jun 2017
Posts: 1,238
Likes: 240
From: Alabama + Vegas + Texas
As in, I didn't have the guts to go to 85 ft pounds, just bein' honest.
Oh, nothing scientific! I was probably thinking "75 ft pounds is factory for head bolts" and that "85 ft pounds that Atlantic British did in the youtube video for ARP studs was near the thread limits" and then just picked something roughly in between those 2 values.
As in, I didn't have the guts to go to 85 ft pounds, just bein' honest.
As in, I didn't have the guts to go to 85 ft pounds, just bein' honest.
That is way too much money for short headers. The ones from Australia are less, but I do not believe they ship to the US. Two of the boltholes on my manifolds are totally buggered, but I will probably put them back on.