redone 45 #1 Posted January 7, 2020 I am searching for two sets of head bolts for k series kohler. 301 Thanks Bill 1 Share this post Link to post Share on other sites
ebinmaine 72,706 #2 Posted January 7, 2020 Others might be able to chime in with sizes here or you could check the manual but I think they're just regular grade 8 bolts. To the best of my knowledge there not a stretch to yield type modern head bolt. 1 Share this post Link to post Share on other sites
bottjernat1 2,194 #3 Posted January 7, 2020 (edited) This should help you.https://www.kohler-engine-parts.opeengines.com/kohler-manuals-free-kohler-engine-parts-list-c-781_86_562/free-kohler-parts-list-download-p-12023 click on your engine and look at page 40 Edited January 7, 2020 by bottjernat1 Share this post Link to post Share on other sites
pacer 3,177 #4 Posted January 8, 2020 As Eric sez -- I just go to the bolt store (usually TSC) and grab a handful of grade 8's. And of course I come home with a mix of 8's and of course another handful of misc grad 5's ---- and .... generally a couple another item or 2! 1 Share this post Link to post Share on other sites
pfrederi 18,682 #5 Posted January 8, 2020 Bolts is bolts but Kohler uses a thick washer. which they sell for over $5 each. they are about .115" thick Share this post Link to post Share on other sites
The Tuul Crib 7,339 #6 Posted January 8, 2020 23 minutes ago, pfrederi said: Bolts is bolts but Kohler uses a thick washer. which they sell for over $5 each. they are about .115" thick Are the washers hardened steel as well? Share this post Link to post Share on other sites
pfrederi 18,682 #7 Posted January 8, 2020 25 minutes ago, The Tool Crib said: Are the washers hardened steel as well? No idea...Pulling against and aluminum head you would not think so but who knows. Share this post Link to post Share on other sites
oldredrider 2,553 #8 Posted January 8, 2020 To test hardness, take a triangle file to it. If it files easy, not hardened. 1 Share this post Link to post Share on other sites
pfrederi 18,682 #9 Posted January 8, 2020 I will give that a try tomorrow great idea I am not a metallurgist. Share this post Link to post Share on other sites
redone 45 #10 Posted January 12, 2020 Hi Guys. I appreciate all feed backs. I like the original parts to make my engines like factory. Resurface heads and block.to new crank bearings. Kohler head gaskets. Bead blast block. Only paint the lower end of block. All shrouds sand blasted primed and painted in factory color. Nothing but the best.. 1 Share this post Link to post Share on other sites
pfrederi 18,682 #11 Posted January 12, 2020 Based on the "file" test they are not hardened... Why they are over $5 each ...no clue. Share this post Link to post Share on other sites
The Tuul Crib 7,339 #12 Posted January 12, 2020 Maybe because they are so thick? Share this post Link to post Share on other sites
