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If this is in the wrong section let me know and I will remove this.
I am putting 799 heads on my 98 Camaro and I went to torque the heads down all bolts went in perfectly fine but when I did the bolts "11 &12" in this picture the bolts snapped off inside the block. So my question is do I have to pull the heads off and somehow figure a way to pull these broken bolts off? I also did some research to see if its fine to run with broken head bolts but there is nothing online about these bolts.
You probably don’t need to pull the heads. I broke one off and spun it back up out with a drill and a 5/16” drill bit. I sharpened the bit to cut left handed and ran the drill in reverse. Spun the broke off bolt right up out.
I tried everything and can not get the broken bolts out without taking the heads off (I dont even know if i can get the bolts out with the heads off) Do you guys think im fine just having 2 missing bolts, I got a small cam and ls6 intake
I would try a left handed drill bit and see if I could back it out. Other than that I would be pulling the head. Did you chase the threads before assembly? Just wondering how you broke those bolts.
Yeah that's weird, for sure. Especially 2 of em. They're 8mm bolts, and they get just a totally ordinary 8mm worth of torque; 22 ft-lbs or thereabouts. Same as any other 8mm bolt. No 8mm bolt should break with that little muscle on it.
Might want to use some other brand of bolts? FelPro for example. And follow their torque specs rather than the factory, since their metallurgy might be different and that's what TTY bolts are all about. (which the 8mm ones aren't... only the bigger ones)
Yeah that's weird, for sure. Especially 2 of em. They're 8mm bolts, and they get just a totally ordinary 8mm worth of torque; 22 ft-lbs or thereabouts. Same as any other 8mm bolt. No 8mm bolt should break with that little muscle on it.
Might want to use some other brand of bolts? FelPro for example. And follow their torque specs rather than the factory, since their metallurgy might be different and that's what TTY bolts are all about. (which the 8mm ones aren't... only the bigger ones)
I had #13 break on my 5.3.....and it was a mahle bolt....by then I was already done.....I said hell with it and sent it on it's way......haven't had any issues with it yet.....knock on wood........on my 370" they were engine pro bolts and I had no problems with any of them even the Lil head bolts had 10.9 on the head like the larger ones, the mahle ones didnt....not on the smaller head bolts for that matter........
Honestly I think you will be ok, just look out for the dust and oiling spot seeing how it's 2 bolts....luckily they are interior bolts and not perimeter. ..your not going boosted I hope....n/a You should be fine..good luck put up some pics if u got them...
Spray some PB Blaster or Liquid Wrench or something down in there.
Take the top part of bolt that broke, drop it in the hole, and use an impact or bit driver and spin it slowly in reverse while pushing down very hard.
I do this to get broken head bolts out. So far has worked every time.
If they aren't cross threaded they will come out really easy. Use a bolt head like Joe Nova said or my favorite thing is reverse drill bits. Grab a reverse drill bit like a 1/8" size and as soon as the bit grabs it'll unscrew the bolts.
You must have accidentally over torqued them, be really careful if you're using a click style torque wrench, it's really hard to feel the click at only 22 ft lbs. Slow and easy and feel very carefully for the click, or get a old school cheapy flex bar style torque wrench, they're only about $20.
As my body shop teacher always said "gently gently, not merrily merrily"
Its possible there was something on the threads and that's why you broke them off. If that's the case and threads are a little jammed only thing gonna get them out is proper extraction. Personally I think I'd take a chance on it and run it like it is and I'm picky about what I let go.
07-04-2018, 03:25 PM
Head Bolts 
