[Fot] Odd wear

[Bill Babcock]

Incidentally, when you say cracked the block, are you talking about cracks in
the short bolt holes on the outer edge of the block? If so, I think most of my
blocks have them. Greg Solow has ARP studs that are a little longer on the
block end. You drill and tap a few threads deeper to help with the problem.
I've used thread repair inserts to help--you drill the hole a little deeper,
use a bottoming tap carefully to get all the way to the end of the hole, make
sure your insert goes in all the way and grind it off flush. Should take full
torque and then some. A lot of people just put in any old insert, assuming
it's going to make everything stronger. If they don't go full length then
you're giving up a lot of strength.

On Nov 6, 2010, at 10:52 AM, Mark Eginton wrote:

> I had a headbolt on a new motor that would not pull past 70 lbs but chose to
drive it for the summer. Turns out a repaired thread insert from PO of the
block cracked the block. So now its winter, I stripped the block today and
found some odd wear on the rod bearings I have never seen before. These parts
have about 300 easy country miles on them.
>
> 1st you will see the rod bearings which have a very small triangle of brass
showing through at the edges. The rods were purchased from a FOTr who rebuilt
and balanced them, ran one race <5500 RPM then upgraded. I've had bent rods
before, I don't think this is it...
>
> Next there is my first lifter that did not appear to be spinning in the
lifter block. It moved very freely up and down. The cam (new Isky 555 grind)
#1 lobe (shown in photo) looks fine... Would you run this one again in a new
block?
>
> Interested in opinions, this motor was not raced and is a mild 10.5:1
build.
>
> Thanks,
>
> M
>
> http://www.flickr.com/photos/28599565@N04/
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