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+--- Thread: Best course of action--broken header bolts (/thread-673.html)
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Best course of action--broken header bolts - Ogeechee 4x4 - 05-18-2008
I have Summit Racing shorty headers on my 351w. On the passenger side, as I was removing the manifold, one of the bolts was already broken off inside the head. I drilled completely through the broken bolt and then broke an easy-out off inside of it. I installed the header with only 7 of the 8 bolts holding it on, and it leaked pretty bad. I removed the header and installed a thicker gasket. During the reinstillation, i managed to strip the threads out of another bolt hole. Now there are 2 of the 8 bolts missing and the leak is driving me batty.
So what would you do to fix this? Remove the head, take it to machine shop to fix, or just remove/replace with a cheap reman head? The engine is a 1995 with about 148K miles.
Best course of action--broken header bolts - broncomania - 05-18-2008
sometimes when you put new heads on a high mileage engine it will cause it to smoke. i would remove the header and drill the holes out again if you can. then clean each thread and re install the header with new bolts.
Best course of action--broken header bolts - Ogeechee 4x4 - 05-18-2008
what kind of bit do i need to drill through the easy-out?
Best course of action--broken header bolts - johnpaulgolf - 05-19-2008
geeche...I don't know a whole lot about this but why could you not drill out a bigger hole and tap it for a new size?
Also I have had some luck with my reverse drill bits.
The easy out is going to give you hell. I don't know about get that out, unless you can get a very small hole started in the center of it and try going a little bigger, little bigger, little bigger blah blah blah blah blah blah blah blah blah blah blah
Best course of action--broken header bolts - blazinchuck - 05-19-2008
try to use a sharp point punch to chip-out the easy out...I would try a carbide bit(to redill the easy out)-gonna cost alot more than standard bits. Then I would drill out the bolts and step up each time with a little bigger bit...until you get 90% of the bolt hole...then retry the easyout or even a tap(gun tap)Chuck
Best course of action--broken header bolts - blazinchuck - 05-19-2008
are you using anti-sieze on the bolts?
Best course of action--broken header bolts - Ogeechee 4x4 - 05-19-2008
johnpaulgolf Wrote:geeche...I don't know a whole lot about this but why could you not drill out a bigger hole and tap it for a new size?
I could do that, yeah. I wonder how much larger I can go before I risk running into a water jacket.
johnpaulgolf Wrote:The easy out is going to give you hell. I don't know about get that out, unless you can get a very small hole started in the center of it and try going a little bigger, little bigger, little bigger blah blah blah blah blah blah blah blah blah blah blah
That's about what i think, too. I'll try that right after I try welding another bolt to this one...and praying I can pb blaster it out :banghead:
blazinchuck Wrote:try to use a sharp point punch to chip-out the easy out...I would try a carbide bit(to redill the easy out)-gonna cost alot more than standard bits. Then I would drill out the bolts and step up each time with a little bigger bit...until you get 90% of the bolt hole...then retry the easyout or even a tap(gun tap)Chuck
That'll be plan #3...4... I donno, but it's one of the plans i have :banghead:
blazinchuck Wrote:are you using anti-sieze on the bolts?
No, i didn't. I never plan to remove the bolts again.
BTW: here's the bolt that is broken. It's the front bolt for the #4 cylinder (i think. pass side, all the way back).
Best course of action--broken header bolts - broncomania - 05-19-2008
Ogeechee 4x4 Wrote:what kind of bit do i need to drill through the easy-out?carbide
blazinchuck Wrote:are you using anti-sieze on the bolts?
use it anyways . if you ever blow a header gasket you will be glad you did.
when you finally get that out buy you a complete set of brand new bolts.
Best course of action--broken header bolts - DeTowman - 05-19-2008
Ogeechee 4x4 Wrote:what kind of bit do i need to drill through the easy-out?
Good luck!! I think I'd pull the head where you could get at it better with maybe a drill press..I'm with Mike if you put on re-man head it may cause it to blow by the rings..
Best course of action--broken header bolts - Ogeechee 4x4 - 05-19-2008
broncomania Wrote:carbide
gotcha
broncomania Wrote:use it anyways . if you ever blow a header gasket you will be glad you did.
when you finally get that out buy you a complete set of brand new bolts.
Ok, but won't the two bolt holes i'm working on be different sizes than the other 6? Well, maybe not if i Helicoil them, but if i just drill/thread...