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Original Message

Machining questions

By Lawrence Friesen - 09/30/2002 10:46:12 AM; IP 216.174.158.16

I found a 390 block with an ' X ' in the lifter valley. is there anything special about that? Casting is a c6me. What is the safe cyl. wall thickness to permit an overbore? It is already 40 thou over. I'd like to go to 4.13 ( 428) It has to be durable enough for 11 : 1 pistons and mild drag racing in a mustang. Also have a 390 partly disassembled with a vertical scratch in one bore deep enough to catch a fingernail. Will this need a hone job or a bore job or will it wear in? This motor had a fresh rebuild about 1200 miles ago.

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Collapse <b>Machining questions</b> -- <font color=#0000ff>Lawrence Friesen, <i>09/30/2002</i></font>

Machining questions -- Lawrence Friesen, 09/30/2002

Boring response -- Tim Johnson, 09/30/2002

Collapse <a href=../ForumFE/reply.aspx?ID=14695&Reply=14687><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor14695" onclick="return false;">RE: Machining questions</a> -- <font color=#0000ff>John, <i>09/30/2002</i></font><script type="text/javascript">
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RE: Machining questions -- John, 09/30/2002

Collapse <a href=../ForumFE/reply.aspx?ID=14699&Reply=14687><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor14699" onclick="return false;">RE: Machining questions</a> -- <font color=#0000ff>Lawrence Friesen, <i>09/30/2002</i></font><script type="text/javascript">
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RE: Machining questions -- Lawrence Friesen, 09/30/2002

I have been faced with this before...... -- kevin, 09/30/2002