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#84561 10/22/2007 4:59 AM | Joined: Aug 2006 Posts: 237 Shop Shark | | Shop Shark Joined: Aug 2006 Posts: 237 | Hello... I installed the exhaust manifolds on my truck (327) this weekend and use some new bolts I got from Napa. I asked the guy there for some exhaust manifold bolts and he when to the bin and came back with a hand full of bolts. I got all of them but 2 installed and was feeling pretty good about it. I ended up not counting the longer ones right and was short 2.
Anyway. These bolts I got have the 3 - on the heads. Dots or dashes..what ever ya call them. Will those bolts be OK to use for exhaust manifold bolts or do I need some other flavor? I have a buddy that was telling me the bolts were head treated or something so now I am worried I need to switch them out?
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#84562 10/22/2007 5:13 AM | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Michael1964, grade 5 bolts [which have three bars on the head] should be fine, but don't use anything stronger, they can't expand when the manifold expands and their heads will pop off, hope that helps. | | |
#84563 10/22/2007 4:08 PM | Joined: Nov 2004 Posts: 1,552 Shop Shark | | Shop Shark Joined: Nov 2004 Posts: 1,552 | Factory GM exhaust manifold bolts have a slightly different shoulder and should be installed with thread locker and torqued per the manufacturer's recommendations. Not knowing any better, I always try to stay with the factory fasteners, when it comes to engine bolts.
For quick reference, three identifying marks = Grade 5, five identifying marks = Grade 8, per Carroll Smith's book entitled Nuts, Bolts, Fasteners and Plumbing Handbook. I have found this book very informative with regards to everything you need to know about fasteners.
I hope this information is helpful.
Tony Smith
4-5-6 Chevy Trucks | | |
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