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#1
02-21-2018, 08:51 PM
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Head bolt question
I have a leaking head gasket on an Onan P216 so I pulled both heads the other night and of course one bolt broke off about 1/4 above the block.
 I looked just about everywhere and can't find replacement bolts....OEM are too much $. The bolts are 5/16 X 2" long with 1.5" of them threaded. Where is a good place to find them? I've looked at McMaster, Summit, GreedBay, Amazon & Googled them but I can not find a grade 8 bolt to match. TIA 
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#3
02-21-2018, 09:05 PM
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#4
02-21-2018, 09:08 PM
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#5
02-21-2018, 10:28 PM
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Thanks all. I looked at a lot of those this morning but they didn't give the thread portion like McMaster does. Most of the grade 8's don't match the amount of threads on the OEM.
Look at the cad drawing of the partially threaded 5/16x2". https://www.mcmaster.com/#91257a591/=1boaa2x I don't think that will work. Would there be any issue using a fully threaded bolt? I'm thinking no but I sure wish the partially threaded would match better.
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This ain't no hobby....it's an addiction
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#6
02-22-2018, 12:15 AM
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Todd, don't you have a local hardware store or something that sells bolts? My local stores do, and so does Rural King. (I know RK's aren't in the south, but TSC, ect...)
There is no issue using an all threaded bolt. How long of threads do you need to go into the block? Should be a flat washer on there too, isn't there?
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#7
02-23-2018, 08:26 AM
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I'm an idiot!
 I didn't think these China bolts would work from TSC by looking at them. DSCN3517.jpg It looks like they will work if I use the original washer and add 1 more.....guess I shoulda checked before I posted. 
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This ain't no hobby....it's an addiction
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#8
02-23-2018, 09:14 AM
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How about studs?
 You could also try ARP, they make some great stuff for race engines http://arp-bolts.com/ This is a 5/16X 2 bolt http://arp-bolts.com/kits/ARPkit-det...?RecordID=2689
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#9
02-23-2018, 09:22 AM
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Looks like you need more thready thingys, any 5/16 dies?
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