47-59 Crank pulley bolt question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**TX3100Guy** · 08-06-2022, 02:15 PM

Long story short, I managed to snap the head (and some of the length) of the crank pulley bolt. I have been able to drill the remaining section and use an EZ-Out to extract the bugger.

Now the question is, should I replace it with a Grade 5 or 8 bolt? My first thought is Grade 8 to ensure it wouldn't happen again, but then I thought "if it does break again (unlikely) would a Grade 8 bolt be harder to drill out and extract."

Don't ask how it broke, its a dumb story.

Name: Screen Shot 2022-08-06 at 1.14.55 PM.jpg
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Name: Screen Shot 2022-08-06 at 1.14.55 PM.jpg
Views: 150
Size: 71.7 KB

08-06-2022, 02:15 PM	#1
TX3100Guy Senior Member Join Date: Mar 2022 Location: Lucas, TX Posts: 610	Crank pulley bolt question Long story short, I managed to snap the head (and some of the length) of the crank pulley bolt. I have been able to drill the remaining section and use an EZ-Out to extract the bugger. Now the question is, should I replace it with a Grade 5 or 8 bolt? My first thought is Grade 8 to ensure it wouldn't happen again, but then I thought "if it does break again (unlikely) would a Grade 8 bolt be harder to drill out and extract." Don't ask how it broke, its a dumb story. __________________ 1953 Chevy 3100 - 5 window 1/2 ton pickup My 1953 Chevy Work-In-Process Photo Gallery "I don't have a carbon footprint, I drive everywhere."



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