Posted by Blue_Tractor_Man on December 21, 2019 at 17:58:37 from (174.236.128.237):
In Reply to: Head Bolts posted by Ted in NE-OH on December 20, 2019 at 18:40:25:
I just semi-restored a Kohler 4 cylinder 12 HP 60 CID flathead generator engine, circa 1965. It had 4 striped head bolts, grade 6. I had never seen 4 striped bolts before. I posted pictures on this forum and someone was kind enough to send me an image from a page in an old bolt catalog that showed the 4 striped bolts.
Head bolts need to have just a little bit of stretch. I would worry that grade 8 would be too hard and stiff. Plus my experience has been that the harder the bolt the more likely it is to snap from fatigue.
I would be afraid to buy a head bolt kit unless it came from the OEM. With so many parts coming from "The Land of Almost Correct" you never can tell what you might get.
Make sure the head is flat. My head was warped real bad. It had to be machined. Also, use oil when torquing those head bolts.
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