LS6 blocks in 2001 & 2002s?
LS6 blocks in 2001 & 2002s? Is it true?
I read somewhere that like 25% of 2002 and 10% of 2001s have LS6 blocks. If so, how can I tell, and what are the advantages to the block over the LS1?
-Jason
I read somewhere that like 25% of 2002 and 10% of 2001s have LS6 blocks. If so, how can I tell, and what are the advantages to the block over the LS1?
-Jason
Re: LS6 blocks in 2001 & 2002s? seArch for a post its been posted on this site recently it has sometinhg to do with a engravement on the block thats hard to get to but according to i think super chevy or gm high tech its true i want to find out but dont have the time to find this plate on the back of my block to check the number
Teching In
Joined: Jan 2003
Posts: 13
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From: Buffalo NY
Re: LS6 blocks in 2001 & 2002s? You need to look for the casting number 12561168 on the back of the block, driver's side, just below the head. Best seen from below with a small mirror sighting along the bellhousing.
The block is stronger/more rigid, both due to geometry changes to recover strength lost by the addition of larger cast-in breathing windows at the bottom of each cylinder through the bearing webs, and also due to the casting method used by the supplier Nemak, who also made LS1 blocks before the LS6 appeared. Since the new casting is common to the LS1 and LS6, it's not always referred to as an LS6 block by suppliers.
The windows are there to reduce pressure in the crankcase caused by the pistons pumping air between each bearing web, this was causing problems with oil drainback and aeration on prototype Z06s
The block is stronger/more rigid, both due to geometry changes to recover strength lost by the addition of larger cast-in breathing windows at the bottom of each cylinder through the bearing webs, and also due to the casting method used by the supplier Nemak, who also made LS1 blocks before the LS6 appeared. Since the new casting is common to the LS1 and LS6, it's not always referred to as an LS6 block by suppliers.
The windows are there to reduce pressure in the crankcase caused by the pistons pumping air between each bearing web, this was causing problems with oil drainback and aeration on prototype Z06s
