im tryin to decide if i should use these 2 blocks i have. how much bore can they handle? im basically lookin to use these motors in my turbo trans am. and possibly use the spare 6.0L in my tahoe with a vig2800 converter to help with towing. not that it needs it the 5.3 has more then proven itself. anyways what cubic inch is capable with these 03 6.0L blocks?

- Scottie

 

They can go .030 over pretty safely and some have even been taken to .040 over.

 

6Ltr blocks can go .040 no problem,anything past that must be sonic tested.

 

.40 is about as far as I would go, are you gonna do a stroker or what?

 

yea id like to get in the 390 cubic inch area. i might just end up sellin these 2 blocks and buyin a ls6 block. i dunno yet.

 

ls6 block is nothing more then a ls1 block.

 

you can go .30 over and use a 4" crank and you will have 408. the 4" crank will drop right in a 6.0

 

LME bored my 408 6.0L to .040 for 4.040 and he said it was fine.

 

4 inch stroker crank on a standard 6.0L bore will net you 402ci. Not necessary to bore it to get the cubes you're looking for.

 

Hey if you're looking to sell one of those 6.0L blocks, I'm interested!