http://cgi.ebay.com/ebaymotors/ws/eB...tem=2441381383

 

Looks good, think i wont be doing anything for a long while, this rebuild just keeps getting more expensive. Anybody done this???

 

ci bore stroke
293 3.780" 3.27" ('99-later "LR4" 4.8 Liter Vortec)

325 3.780" 3.62" ('99-later "LM7" 5.3 Liter Vortec)

346 3.900" 3.62" ('97-later Gen.III "LS1")(6.098" rod)

364 4.000" 3.62" ('99-later "LQ4" 6.0 Liter Vortec)

click here for website

 

.120" over is a HUGE overbore on a stock block. You block will be FAR weaker bored that far over. Why not just source out a 6.0 core or LS1?

 

how much weaker? that is the max i have heard for it but i doubt they would do it if it seriously weakend the block.

 

They dong bore a 6.0 to a 408. They stroke these motors to those sizes. Yes you can bore a 5.3 to a 5.7 spec block but to get any more cubes you will need to stroke it.

 

There are a few fbodys that have done this with a 5.3 block already. Do a serach in the internal section

 

Did a search for 5.3 stroked and found nothing so I am going to put a post up in the internals section to see if anyone has done it.

 

Not sure if you are still watching the thread but good info. Thanks!

 

if the block can handle the .120 over bore that your talking about, then all the 4.8/5.3 guys can have a nice motor using their stock block, but once the motor lets go, the block will probably have to be thrown away, unless these blocks can really be bored out a ridiculous amount. . .