stretch head bolts vs. regular bolts?
Legend
Joined: Jul 2011
Posts: 8,259
Likes: 4
From: Austin, TX
His status has changed form "MY truck won't run" to "parts truck!" heehee...
Champion
Joined: Aug 2010
Posts: 2,697
Likes: 3
From: Cape Carteret NC
intake bolts that I've encountered (mopar tty) are not threaded to the head..
there are a good number of people who've used grade 5 and grade 8 bolts on the intake manifold with no ill effects.. I think it is the 408 dakota guy who comes here often who uses and has reused grade 5's there.. i reckon the trick is what compound of thread lock used, and then getting a wet bolt to torque correctly.. the dry TTY are pretty easy to get in right.. but, all that said, the intake bolts from mopar are without doubt absolutely tty..
insofar as head bolts- there ain't no way I'd use hardware store bolts.. the tensile strength of those things is questionable no matter the grade.. they are shear strength capable, but not designed for constant high pressure stretch.. once they stretch the tiniest amount, that is their 'new' tensile strength.. they are far too deep in the engine to hafta get to if you gotta replace them, unless you do them one by one on a known good gasket.. which is something that would scare me to do- though a lot of folks actually stud their heads in just that way..
there are a good number of people who've used grade 5 and grade 8 bolts on the intake manifold with no ill effects.. I think it is the 408 dakota guy who comes here often who uses and has reused grade 5's there.. i reckon the trick is what compound of thread lock used, and then getting a wet bolt to torque correctly.. the dry TTY are pretty easy to get in right.. but, all that said, the intake bolts from mopar are without doubt absolutely tty..
insofar as head bolts- there ain't no way I'd use hardware store bolts.. the tensile strength of those things is questionable no matter the grade.. they are shear strength capable, but not designed for constant high pressure stretch.. once they stretch the tiniest amount, that is their 'new' tensile strength.. they are far too deep in the engine to hafta get to if you gotta replace them, unless you do them one by one on a known good gasket.. which is something that would scare me to do- though a lot of folks actually stud their heads in just that way..
Rookie
Joined: Dec 2012
Posts: 82
Likes: 0
So what kind of bolts do the Hughes plenum kit and others come with? I don't remember if they were threaded to the head or not, but I only torqued to 144 in./lbs. I know the original bolts seemed "warped" near the bottom threads..theres no way i would reuse those especially since one broke off in the head. I hope the kit came with the correct hardware! They are nice and shiny though
Last edited by coldsteel5; Mar 28, 2013 at 02:36 PM.
