As the thread title states I'm curious if this is possible on a reworked ls6 350 block. Basically what I'm thinking is re-sleeving the block using ductile iron sleeves and running a 4.125" bore on the stock 3.62 stroke (makes a 387 / 6.3 liter). As far as internals, attempt to lower rotating mass as much as possible obviously. Was looking at the Callies magnum XL crankshaft and they claim a weight of around 38lbs vs the stock 52lb crank. Next using forged titanium connecting rods (414grams vs manley pro series lightweight 609gram rods), Titanium wrist pins (40% lighter than steel pins), and JE's new "Asymmetrical" Titanium forged pistons it seems like you could literally remove about 2-3 cylinders worth of rotating weight!! I don't know maybe im going crazy or something . If this is possible though i was thinking this combined with individual throttle body's and a semi aggressive track/street heads and cam setup could possible be a very high output small block NA setup that would rev to the damn moon but still be some what smooth at idle due to the ITB's. What you think?

 

I don't know about 9,000 RPM. But, I am sure you will get more power by reducing weight on the crankshaft. Keep us informed as you build it.

 

Youll need one hell of a head and cam valvetrain and intake to get 9k reliably. Dry sump would be worth looking into also.
You will not have a smooth idle period, no way. May be a little soggy below 4-5k


Keep us posted

 

Alright did a little more research into this and from what i'm told it can be done for about 20k . That being said im just gonna use a larger intake manifold and TB and standard forged parts and shoot for 7,500 rpms .

 

if you test this, whether you are successful or not, post videos. i cant imagine how an LS will sound revving that high or even attempting to

 

The answer is yes and no. Yes an LS6 can be built to rev to 9k but a tad bit more than 20k for a company that specializes in road race engines. The no is that your ecm is hard limited to just under 8192 RPM.