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Questions about exhaust manifold bolts and oil dipstick tube
71 C-10 402
Based on truck history, I'd have guessed these or most would be the original exhaust manifold bolts. Perhaps they are, but what a hodge podge. Some grade 5 & some grade 8. One is grade 2, which I bet we added when the A/C was pulled long ago.
Are the exhaust manifold bolts "supposed" to be grade 5 or 8? I'd guess 5.............................. On a side, Classic industry sells "original reproduction flange head bolts" for the exhaust. Not that I have much experience, but neither of my trucks have flange bolts. They're just a hex head and use lock washers.
The dip stick tube I pulled didn't have an O-ring, are they supposed to? From what I see there wasn't a leak.
Thank you.
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Tony
71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring the truck from ground up. With assys, the guide accts for 1000s details, OEM identifications & part numbers, written in short order. 700+ images of assm., illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025
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