LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

383 .20 or .30 over??

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Old Aug 27, 2004 | 01:29 PM
  #1  
Camaro_Guru16NY's Avatar
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From: Jamestown, NY J&P MUscLE
383 .20 or .30 over??

like it says


thanks,
-john
Old Aug 27, 2004 | 01:32 PM
  #2  
zhevy-1's Avatar
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Re: 383 .20 or .30 over??

0.30 to be a true 383, wouldn't it?
Old Aug 27, 2004 | 01:35 PM
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Re: 383 .20 or .30 over??

Have your machinist do the minimum it takes to get the bores true. Also check to see that you can get the pistons you want in that size off-the-shelf or are the going to be cu$tom order?

-Mindgame
Old Aug 27, 2004 | 02:24 PM
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Re: 383 .20 or .30 over??

Originally Posted by zhevy-1
0.30 to be a true 383, wouldn't it?
Agreed.

Plus .030 over is probably more common and will have more options available as far as parts are concerned.
Old Aug 27, 2004 | 02:51 PM
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Re: 383 .20 or .30 over??

Originally Posted by Mindgame
Have your machinist do the minimum it takes to get the bores true. Also check to see that you can get the pistons you want in that size off-the-shelf or are the going to be cu$tom order?

-Mindgame
^^^

My block was already .030 over, but it needed a little more boring to clean it up. Don't get caught up in the numbers (38Xcid). Less material (larger bore) = earlier retirement .

Ryan
Old Aug 27, 2004 | 05:48 PM
  #6  
CamaroRob97's Avatar
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From: Goose Creek, SC
Re: 383 .20 or .30 over??

Certainly is....


4.030 x 4.030 x 3.75 x 8 x .7854= 382.6680858, obviously rounded up but yeah....
Old Aug 27, 2004 | 08:27 PM
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SilverStreak's Avatar
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From: Crown Point,IN,US of A
Re: 383 .20 or .30 over??

Originally Posted by CamaroRob97
Certainly is....


4.030 x 4.030 x 3.75 x 8 x .7854= 382.6680858, obviously rounded up but yeah....

Pretty smart for an eclipse owner.. just havin fun
Old Aug 27, 2004 | 08:48 PM
  #8  
billy mensch's Avatar
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From: oklahoma
Re: 383 .20 or .30 over??

if you can just go .20 over the more you bore the hotter it will run
Old Aug 27, 2004 | 11:52 PM
  #9  
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Re: 383 .20 or .30 over??

Frankly, if you were lucky enough to be able to go .010 over, you should do it.

I guess you could make an argument that if you don't plan on rebuilding again, going .030 over would give you the best range of options at the lowest cost, but I don't think the price difference or the option difference was as significant as it was 20 years ago, so I'm not sure that's something really worth worrying about anymore.
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