[DeTomaso] Cylinder Wall question

[Will Kooiman]

I did block filler on my previous 351C up to the bottom of the freeze plugs.

The oil temps run about 20-40 deg higher.  If you do this, you want to
consider running a heat exchanger.

You want to get the HardBlok for a full fill.  You don't have to do a full
fill.  Just use what you need to get the hardblok to the level you want.  It
contains 2 pouches - one for each side.  I think Dave Williams has
instructions on his site that describes how to do it.  At any rate, if you
get the half-fill HardBlok, it won't be enough.  It'll go about 1/2 way to
the freeze plugs.  If I were doing it again, I'd add more water.  I had a
hard time getting the hard block level.


-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Thomas Borcich
Sent: Saturday, August 15, 2009 9:58 AM
To: Pantera JDeRyke; Pantera REALBIG forum
Subject: [DeTomaso] Cylinder Wall question


Jack I've read numerous posts on the subject and thats what I was concerned
with...I like Will's answer better. 
I talked to a machine shop Friday that said we should magnaflux the block,
but that will only tell me if there 
are cracks...sonic testing is the way to go.

I've seen some posts on block fillers?  Below is a link on sonic testing
that shed a lot of light on the subject.
The article brings up block filler...anyone had success using block filler
on a Cleveland if the walls are thin?
And I know that is a loaded question...how thin, and how much block filler,
etc. etc.

http://www.superchevy.com/technical/engines_drivetrain/shortblock/0404sc_son
ic/index.html

Tom



From: JDeRyke at aol.com
Date: Sat, 15 Aug 2009 02:32:55 -0400
Subject: Re: [DeTomaso] Cylinder Wall question
To: tborcich at msn.com; detomaso at realbig.com

I'm guessing but some wall discolorations are from the wall actually flexing
away from the hone during cylinder bore finishing, or from rings skipping
over thin spots, leaving a funny wear pattern. Sonic-map the thing so you
know what you've got! And don't be surprised if you have to go thru 3 or 4
blocks to find one thats worth fooling with. As usual on Cleveland blocks, I
advise ALL blocks be sonic mapped before investing one dime more. I've seen
030"-over blocks that had less than 0.080" wall thicknesses; I have a piece
of one laying on my desk that broke iat high rpms, and nothing was left
useable including one of the two heads. Such blocks are not recommended for
any except standard horsepower- and even that is iffy. Performance Chev
engine builders get nervous when wall thickness drops below 0.200"....

 Good luck- J Deryke
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