Alright, I have a iron block 6.0. It has 2003 LQ9 rotating assembly. I figure I want to do this motor once and be done with it and get what I want out of it originally, doing all the work on the engine stand. I am thinking I want a little more displacement out of it.

If I bored it .030 would I need an entirely new rotating assembly?

If so, would it make more sense to straight up go 408?

I want good naturally aspirated power and then I intend to spray on top of that. I will probably mill the heads down a little more to give me in the realm of 10.8:1 compression or thereabouts.

I came about this short block by chance for pretty cheap, it had been sitting out for a few weeks (coverred with plastic) and the cylinder walls have a bit of rust on them, I used some scotch bright and got nearly all of it out after tearing it down to bare block. I was thinking that I would at least give it a little freshening up but I dont know how to hone or have the cylinders machined to where I wouldnt need new pistons etc etc (if i decided not to bore it out) would this be possible?

note** the motor came with LQ4 internals but I just bought an LQ9 rotating assembly so its in excellent condition.

Sorry if some of the questions are quite newbish. I would like to do this right the first time.

-David

edit- I did some extra searching and caught a thread about going with a 4.050 over bore with the stock crank and some forged rods and pistons for a 370?

 

if you bore it 30 over you dont need to go 408..just put some forged pistons (or rods if youwant) and be just fine..but you it wont hurt at all goin to 408

 

so I would need some pistons for a 4.030 bore I assume. How many cubes would this yield me? For the cost of the machining, would it be better to go bigger because the cost of the pistons is going to be relatively the same or what?

 

yes you would need pistons for the bigger bore..if i was to ever tear down my pistons this is what i would go with http://cgi.ebay.com/ebaymotors/H-BEA...QQcmdZViewItem mahle pistons, rings and pistons for $760..thats really not a bad price.. just tell them what bore and stroke you need

 

Get a hold of Richard @ WCCH or jetmann and see what they recommend

 

If I was to go with a 408, would I be able to use my stock crank, or would I have to get a new one? I would like to use my stock crank for the record.

How much would I have to bore to get a 383 or close to?

 

408 is using a 4'' stroke crank..

 

alright, well then looks like I will just bore everything out, get new pistons, probably rods too and see what kind of displacement I can safely achieve.

edit: what is stock stroke?

 

3.622

 

i know what your going through..all these ideas..haha..just depends on how much money you got to spend