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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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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?
Jesus is Lord! Only through the blood of Jesus are you washed clean of your sins. Come see us... Dad's Chevy Our VideoGod bless you! Michael..
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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
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