Redline-Motorsports

iTrader: (3)

Just trying to confirm the "stock bore" for the 5.3L motor that is used in the P/U's. Also stock rod length as well.

I apparently spent to much time with the 5.7 that I never really kept up on the little brother motor!!

BigTex

iTrader: (16)

Rod and crank should be the same as they have the same stroke as the LS1, but the bore is 96.01mm. Stock displacement is 9.5:1.

Redline-Motorsports

iTrader: (3)

I assume that it is safe to bore these motors to a 3.90" bore?? There looks like there is a ton of meat!

really slow truck

yep, a 3.9" bore is safe on the 5.3L block (according to nick agostino) here is what he said in a thread that went through about a week ago.

Bryan

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> The max you can go on the 5.3 block is 3.910 +-.005. We have sonic tested many and this about where you want to be bore wise. The cheapest combo is a 6.0 crank with 5.7 rods and pistons to make a 5.7. Call Barry or Wade at the shop and they prob. have some stuff around for a good price. The max stroke you can go is 4.125 which will yield 396 inches with the 3.905 bore. Hope this helps.
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red53gmc

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by really slow truck:
<strong>
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> The max you can go on the 5.3 block is 3.910 +-.005. We have sonic tested many and this about where you want to be bore wise. The cheapest combo is a 6.0 crank with 5.7 rods and pistons to make a 5.7. Call Barry or Wade at the shop and they prob. have some stuff around for a good price. The max stroke you can go is 4.125 which will yield 396 inches with the 3.905 bore. Hope this helps.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"></strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hmmm... The 5.3,5.7,and 6.0 cranks/rods are all the same as they have the same stroke. All you would need is the pistons/rings.

So, bore it and your expenses include the machine work and pistons/rings.

really slow truck

yep, thats what i was thinking too

i believe it was the 99 and MAYBE the 2000 6.0L cranks that were a different part number from the ls1 cranks, but other than that yes.