LS6

Greeting

Have someone bored the LQ4 or LQ9 to 4.125"?

I know for sure the water jackets will start to be exposed when reaching 4.270"...

With the iron block to bore to 4.125" seems dowable if the application is only natural aspirated...


MRT

kdavis

iTrader: (14)

as far as i know you will need to get the block sleeved

LS6

See the below links

https://ls1tech.com/forums/generation-iv-internal-engine/1026866-how-big-can-you-bore-6-liter-block.html

https://ls1tech.com/forums/generation-iv-internal-engine/835980-lq9-truck-iron-6-0-max-bore-size.html

https://ls1tech.com/forums/generation-iii-internal-engine/588426-how-big-can-you-bore-out-iron-block.html

I think MTI done before the boring of the LS1/LS6 block and they noticed that the water jacket start to expose at 4.275". The LQ4/LQ9 Block do have thicker wall thickness than the LS1/LS6 Block.

Thanks

batboy

iTrader: (6)

With the exception of a couple people that claim they have done 4.125", the rest of the whole world seems to agree the most you can safely go is 4.065".

redtan

iTrader: (5)

Why would you sleeve an iron block?

kdavis

iTrader: (14)

I personally wouldnt. Aluminum gen 4 blocks can be had very cheap

melsie68

iTrader: (8)

The best thing you can do is take your block to have it sonic checked. From what I understand most all of them can go to 4.080" safely. I have also heard about 1 in 5 can go to 4.100" safely. But they absolutely need to be checked. It depends on the shop you talk to but you don't want to run less than .100" cylinder wall thickness in an N/A application- horsepower dependent of course.

warriorcustoms

iTrader: (10)

just bore it to the specs of the 427 stroker kit and get a crank and pistons hell if i had one thats the route id go and iron blocks get sleeved every day had to on my 355 in my old IROC Save your money and do the 427 They can go to 440 if ya want just research a lil