Boring Stock Aluminum Blocks

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Jul 3, 2002 | 11:29 AM

ls1290

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Boring Stock Aluminum Blocks

I was wondering if a stock, 3.89" bore, block be over bored? Say like 0.030" or 0.040" over? TIA

Jul 3, 2002 | 11:48 AM

GeorgeC

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Re: Boring Stock Aluminum Blocks

The factory spec on 2000-up blocks is .010 overbore, but I do know for a fact that some blocks can be taken out more than that if they are sonic tested and shown to be thick enough in the critical areas... I had a .050 over aluminum block for a short time.

Jul 3, 2002 | 01:16 PM

SJH

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Re: Boring Stock Aluminum Blocks

.050?
Wiseco pistons are .005 over FYI.

Jul 3, 2002 | 01:19 PM

XLR8NSS

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Re: Boring Stock Aluminum Blocks

Yep, Stock aluminum blocks are boring. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Jul 3, 2002 | 02:30 PM

Ragtop 99

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Re: Boring Stock Aluminum Blocks

<blockquote>quote:<hr />Originally posted by GeorgeC:

I had a .050 over aluminum block for a short time.<hr /></blockquote>Most of us like to measure engine life in years, not minutes! <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Jul 3, 2002 | 10:02 PM

GeorgeC

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Re: Boring Stock Aluminum Blocks

<blockquote>quote:<hr />Originally posted by ls1290:
 <blockquote>quote:<hr />Originally posted by GeorgeC:
I had a .050 over aluminum block for a short time.<hr /></blockquote>Why only a 'short' time?<hr /></blockquote>To make a long story short, a wristpin broke just after initial break-in (evidently a defective part), doing some pretty major damage along the way. Since the block and 2 pistons had to be replaced anyway, I just decided to go ahead and do a 4.100" bore motor this go around...

Jul 3, 2002 | 10:03 PM

GeorgeC

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Re: Boring Stock Aluminum Blocks

<blockquote>quote:<hr />Originally posted by SJH:
.050?
Wiseco pistons are .005 over FYI.<hr /></blockquote>Yes, .050, as in 3.950" bore, 355cid... I had a hard time with it at first too... It seems to be a little more commong than a lot of people would suspect, though. You just have to find the right block.