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 Post subject: Spark Plugs
 Post Posted: Fri Sep 16, 2011 11:09 am 
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Joined: Mon Mar 26, 2007 10:18 am
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Location: Sharon Hill PA (Phila area)
Need a little help. I need a 5/8" reach plug rather than the 3/4" reach. BBC 13.5:1 Alum head roller cam. The heads needed some work for piston clearance, so now I need a shorter plug. Does anyone have suggestions?

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 Post subject: Re: Spark Plugs
 Post Posted: Fri Sep 16, 2011 11:47 am 
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I had one of those BBCs that I had to index the plugs to keep the ground strap from getting hit by the pistons. Also make sure that you're not using an extended tip plug.

Not sure that a 5/8" reach plug will work all that well in a 3/4" hole? :-k

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 Post subject: Re: Spark Plugs
 Post Posted: Fri Sep 16, 2011 5:47 pm 
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Hole is only 5/8 now, a little bit had to come out of the top of the head. Not burring the plug

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 Post subject: Re: Spark Plugs
 Post Posted: Sat Sep 17, 2011 12:02 pm 
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What about using some indexing washers under all of the plugs to move them out a little?

Rick


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 Post subject: Re: Spark Plugs
 Post Posted: Sat Sep 17, 2011 2:25 pm 
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rick360 wrote:
What about using some indexing washers under all of the plugs to move them out a little?

Rick


I've seen those indexing washers up to .060 thick. Could use two of those on each plug and that would do it.

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 Post subject: Re: Spark Plugs
 Post Posted: Sat Sep 17, 2011 6:53 pm 
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If you use indexing washers you need to think about the heat conduction path for the plug. The plug will run hotter if pulled out too far.


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