Engine bore questions...
Thread Starter
Staging Lane
Joined: Oct 2002
Posts: 76
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From: Mckinney, TX (north north Dallas)
Engine bore questions... Ok, I've been reading a few things and I've managed to confuse myself, I think... <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
So, from what I do understand, and please correct me if I'm wrong, the stock LS1 has a 3.900" bore. I've heard that the stock piston size is 3.898". I'm assuming this is accurate as it would probably be extremely hard to get a piston that was exactly 3.900" to move in a hole that is exactly 3.900" in diameter. So there seems to be a 0.002" difference in bore size and piston size for clearance, correct so far?
Now, I've also read/heard that a standard overbore is 0.005", which would make the bore now 3.905". Assuming that 0.002" difference, the correct piston size would now have to be 3.903" in diameter, correct?
One more question, with a few parts...
When getting these engines honed, do they just remove the glaze, or do they actually open the bore up that 0.005"? Or is this something you'd have to tell the machine shop to do? Also, does the machine shop have to punch out the existing sleeves in a stock LS1 and resleeve it to go to the 3.905" bore size, or can this be done by a slight overboring of the existing stock sleeve?
Sorry if these answers are listed somewhere elese, I've been trying to find out what I can and I just want to make sure I have everything correct. Thanks!
<small>[ October 22, 2002, 10:40 AM: Message edited by: LeadFoot2 ]</small>
So, from what I do understand, and please correct me if I'm wrong, the stock LS1 has a 3.900" bore. I've heard that the stock piston size is 3.898". I'm assuming this is accurate as it would probably be extremely hard to get a piston that was exactly 3.900" to move in a hole that is exactly 3.900" in diameter. So there seems to be a 0.002" difference in bore size and piston size for clearance, correct so far?
Now, I've also read/heard that a standard overbore is 0.005", which would make the bore now 3.905". Assuming that 0.002" difference, the correct piston size would now have to be 3.903" in diameter, correct?
One more question, with a few parts...
When getting these engines honed, do they just remove the glaze, or do they actually open the bore up that 0.005"? Or is this something you'd have to tell the machine shop to do? Also, does the machine shop have to punch out the existing sleeves in a stock LS1 and resleeve it to go to the 3.905" bore size, or can this be done by a slight overboring of the existing stock sleeve?
Sorry if these answers are listed somewhere elese, I've been trying to find out what I can and I just want to make sure I have everything correct. Thanks!
<small>[ October 22, 2002, 10:40 AM: Message edited by: LeadFoot2 ]</small>
Re: Engine bore questions... I've seen folks just deglaze the cylinder walls.
I have seen folks go with 3.903 etc. pistons for a 3.095 overbored motor BUT BUT BUT work with an engine shop to determine all of this.
I have seen folks go with 3.903 etc. pistons for a 3.095 overbored motor BUT BUT BUT work with an engine shop to determine all of this.
Launching!
Joined: Sep 2002
Posts: 297
Likes: 0
From: Clinton Twp. Mi
Re: Engine bore questions... LeadFoot2 - The popular overbore size for the LS1's is 3.905". This is achieved by actually honing the material out of the bores, not just deglazing the cylinders. Stock bore is 3.898" so to get 3.905 you would be taking out .007". If you have anymore questions you can email me with them or call.
Thanks,
Chris Gelineau
Diamond Pistons
877-552-2112 toll free
cgelineau@diamondpistons.net
Thanks,
Chris Gelineau
Diamond Pistons
877-552-2112 toll free
cgelineau@diamondpistons.net
