Helicoils in Bowtie block
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Helicoils in Bowtie block

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    Default Helicoils in Bowtie block

    I have a chance to buy a 10.2 mark IV 4.5 block form a freind. It was used in a 1200 or so hp procharged boat motor. It needs most if not all of the head bolt holes helicoiled. Is it still reliable after helicoiled and does anyone make a blind insert instead of a helicoil? I plan on using studs and motor will make less than 1000 hp. Thanks

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    Quote Originally Posted by jungledave View Post
    I have a chance to buy a 10.2 mark IV 4.5 block form a freind. It was used in a 1200 or so hp procharged boat motor. It needs most if not all of the head bolt holes helicoiled. Is it still reliable after helicoiled and does anyone make a blind insert instead of a helicoil? I plan on using studs and motor will make less than 1000 hp. Thanks
    I would use Keenserts... No wire coil to spring free and back out with the bolt, solid insert full depth and staked in place.
    They may be harder to replace, but they are far less likely to need replacement in the first place than the wire coil style.
    They can be installed blind.You will need a bottom type tap.

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    Quote Originally Posted by PCE680 View Post
    I would use Keenserts... No wire coil to spring free and back out with the bolt, solid insert full depth and staked in place.
    They may be harder to replace, but they are far less likely to need replacement in the first place than the wire coil style.
    They can be installed blind.You will need a bottom type tap.

    i agree 100%, red loctite and stake in place, i believe they make them in grade 8 as well.you will never have to worry about them, they are actually used for oversized head bolts in some aluminum block applications

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    Helicoils better than threads...I have 30 in my iron block and it will have 32 next time it's goes together...Studs are a good idea too.
    My block did have about a dozen inserts it it when i got it...had some issues with them..i don't think they are as hard as helicoils...Zero problems with helicoils, red loctite and studs (no loctite on studs)....just need to be careful when cleaning the threads out with a tap.
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    I HATE bolt holes that go into water jackets, just because the head studs eventually always pull. I prefer heli-coils initially but will go to keen-serts after the heli-coils give up which they do eventually. The keen-serts need a pretty big hole and I hate to go that far before I have too.
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    I would use Time serts! Check them out on there web page. They are a solid insert and I sell tons of them. If interested call me at specialty fasteners. Bobby

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    Quote Originally Posted by David 519 View Post
    I HATE bolt holes that go into water jackets, just because the head studs eventually always pull. I prefer heli-coils initially but will go to keen-serts after the heli-coils give up which they do eventually. The keen-serts need a pretty big hole and I hate to go that far before I have too.
    I think they make a thin wall Keen-sert as well as a standard wall.

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    Keenserts come in thin wall and thick wall, but not in the extra thick wall.
    The beauty of the keen sert is it uses a standard tap for the insert. The thin wall 7/16-14 uses a 9/16-12 tap and the thick wall uses a 5/8-11 tap. Timeserts and helicoils require a special tap to install them.

    The idea of using helicoils as a first step to save the hole size is a fallicy. The tap for a 7/16 helicoils is so close to a 9/16-11 tap required for the keensert, that you can thread a helicoil into the 9/16-11 hole like it was made for it. But you can't thread the bolt/stud into the heliocoil because the pitch is now 11 threads instead of the required 14. But the diameter is almost exactly the same as a thin keensert, and the keensert is much stronger, and secure. If rust on the insert bothers you, keenserts are available in SS like a helicoil.



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    Last edited by gn7; 01-13-2013 at 11:13 PM.

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    Default E-Z Lok

    Last time I needed to save a hole(s) I used "E-Z LOK" inserts... The holes had already been screwed up by whoever installed the Helicoils off center/out of square..... The OD of the EZ LOK was large enough to correct the position/angle of the threads....
    Ray
    PS No one in Bullhead stocked Keencerts, but the Aircraft supply guy in Mohave Valley had the EZ LOKs in stock....
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    Quote Originally Posted by PCE680 View Post
    I would use Keenserts... No wire coil to spring free and back out with the bolt, solid insert full depth and staked in place.
    They may be harder to replace, but they are far less likely to need replacement in the first place than the wire coil style.
    They can be installed blind.You will need a bottom type tap.
    I agree with Ron also.. Very nice when completed.. I've had to do some in my cylinder heads due to pulling jesel studs out of the head.. Much stronger!!!
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    Quote Originally Posted by Moneypit View Post
    Last time I needed to save a hole(s) I used "E-Z LOK" inserts... The holes had already been screwed up by whoever installed the Helicoils off center/out of square..... The OD of the EZ LOK was large enough to correct the position/angle of the threads....
    Ray
    PS No one in Bullhead stocked Keencerts, but the Aircraft supply guy in Mohave Valley had the EZ LOKs in stock....
    Rich's Industries?
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    Default Yep...

    Quote Originally Posted by stix818 View Post
    Rich's Industries?
    Yes, Rich industries.... He's saved my bacon a few times with off the wall stuff you'd never find at Auto Zone.....

    Ray
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  15. #13
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    Quote Originally Posted by Moneypit View Post
    Yes, Rich industries.... He's saved my bacon a few times with off the wall stuff you'd never find at Auto Zone.....

    Ray
    Yeah, we use him quite a bit.. We keep him and the Bolt Nazi busy!!! That's my oldman on the front sign!! Good buys, both of them!!!
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