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Original Message

Boring a 352 .050 over is an execllent idea.

By Dave Shoe - 06/01/2001 5:08:01 AM; IP 216.243.158.57

Boring an FE .230 over is not.

Ay time you bore a performance FE, you really need to sonic check the block to verify core shift is satisfactory. If performance is not a primary goal of the rebuild, the sonic mapping is optional. This is apparently true of most any '50-'70s era iron block, but I only know about FEs.

Assuming the nominal cylinder wall thickness for a 332/352 is maybe .170", then tolerances and core shift will commonly allow thin sections of .120" (I've found .100" is not uncommon on unbored 390 blocks). Boring .050" over thins this number by .025" - no big deal. Boring .230" over drops .115" from this number. That's a big deal.

I sure wouldn't sweat the .050 bore of the 352 block. You have a right to worry a little if you didn't drop $50 for a sonic map, as you truly are taking a small risk in building a performance motor without knowing it's construction numbers.

Sonic mapping also allows "offset boring" of a core-shifted cylinder so that a .050 overbore will only take "taper wear" of maybe .005"-.010" out of the thin wall, and will remove the bulk .040"-.045" balance from the thick wall. This makes "tromping" on it so much more relaxing.

JMO,
Shoe.

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Collapse <a href=../ForumFE/reply.aspx?ID=6604&Reply=6604><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor6604" onclick="return false;">`someone told me 332 earlysolid will bore</a> -- <font color=#0000ff>gerald, <i>05/31/2001</i></font><script type="text/javascript">
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`someone told me 332 earlysolid will bore -- gerald, 05/31/2001

Nope. -- Dave Shoe, 05/31/2001

Collapse <a href=../ForumFE/reply.aspx?ID=6608&Reply=6604><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor6608" onclick="return false;">RE: ` i sean it with 30 amc 390pis nm</a> -- <font color=#0000ff>gerald, <i>05/31/2001</i></font><script type="text/javascript">
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RE: ` i sean it with 30 amc 390pis nm -- gerald, 05/31/2001

Collapse <a href=../ForumFE/reply.aspx?ID=6612&Reply=6604><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor6612" onclick="return false;">My 352 is now a 390</a> -- <font color=#0000ff>Glenn, <i>06/01/2001</i></font><script type="text/javascript">
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My 352 is now a 390 -- Glenn, 06/01/2001

Boring a 352 .050 over is an execllent idea. -- Dave Shoe, 06/01/2001