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Author Topic:   Stripped head bolt hole
Mark13760
Member
posted October 11, 2004 06:23 PM
I have a stripped head bolt hole, anyone know a cheap solution? I was told to try to use a little bigger bolt since there are threads, just can't get it tight enough to meet torque, anyone run into this before?
I know of helicoil, but is there an easier way?

Thx

amonett3rdgen
Member
posted October 11, 2004 06:31 PM
heli coil it we did it a couple years ago and still no problem.


Mark13760
Member
posted October 11, 2004 08:11 PM
do you have to remove the motor or what?
at the moment I have no way to remove it, or can a helicoil be done with motor in?
also is it easy to do?

Thx for the fast reply

Mark13760
Member
posted October 11, 2004 08:27 PM
I have a 350 block, do you happen to know what size kit I would need?


Flanndad
Member
posted October 12, 2004 05:01 AM
I had a couple of them also.
You don't have to remove the motor, but you will have to remove the intake and head.

What we did was get a big piece of plastic, cut a hole in it bigger than the bolt hole and tape it down to the block.
This will keep all metal shavings out of the motor.
Then you will have to drill out the stripped bolt hole to insert the helicoil.
Use a framing square or something to make sure you drill it square to the block.


Mark13760
Member
posted October 12, 2004 05:21 AM
Thank-you,
I already have the head removed and waiting. anyone know what size heli coil I would need for a 350 block?

Thx

ford5
Member
posted October 12, 2004 05:36 AM
7\16ths- buy the heli-coil kit and everything you need is in there, you will get enuff inserts to repair several holes
I have bought the kits from NAPA


outlawstock17
Member
posted October 12, 2004 05:36 AM
get a helicoil kit. the size you need is the same size as the original thread. i believe it's 7/16's for a SBC head bolt. don't quote me on that, i'm a ford guy.

the kit comes with and oversize tap, insertion tool and several inserts. use the recommended drill bit size to drill out the stripped hole. you may have to buy a drill bit too, sometimes they're a weird size. i think the 7/16's kit uses a 29/64 bit. tap it with the tap in the kit, then thread the helicoil into the tapped hole. once you get it to the proper depth, break the tang off the bottom of the insert and you're set...

[This message has been edited by outlawstock17 (edited October 12, 2004).]

outlawstock17
Member
posted October 12, 2004 05:37 AM
doh! ford5 posted at the same time!


supwitchew
Member
posted October 12, 2004 06:37 AM
That's just scary. Ford minds think alike?


andykmod
Member
posted October 12, 2004 01:37 PM
After you heli-coil it i would use a head stud in it,might be a little less stress on the hole when torque'in it.


Okie11m
Member
posted October 12, 2004 06:26 PM
If your not perfect on the strait part a head stud wont work. We did one & had a friend eyeball the drill for me & it was off a few deg. I had studs in the rest of the holes & the head wouldn't go on so I put a bolt in it. Two seasons & counting!!!


Mark13760
Member
posted October 12, 2004 06:55 PM
Appreciate all the insight, I picked up a 7/16 heli coil kit, and 29/64 bit earlier and will attempt it tomorrow. lmao Lot of work and worry for just having 2 races left this year.


Okie11m
Member
posted October 13, 2004 08:30 PM
Could be 2 wins too!!!!!!!!!!!