When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hey guys, I have been looking around lately at buying a new forged LS2 short block to swap into my 2004 Z06. I recently finished by build and am making way more power than I expected on the stock LS6 bottom end, 829 / 747 at 13 psi.
Here is my build list: A&A V3 Ti with 3.6" pulley 80# Deka injectors 52mm Turbosmart BOV NGK TR6 plugs 2 bar MAP sensor IAT sensor spliced post MAF
A&A external dual fuel pump with return Turbosmart FPR2000 - static Alky meth injection - single nozzle
ATI stock sized balancer - pinned ARP crank bolt Katech C5R timing chain C6 PS pulley Melling 10295 high pressure oil pump (red spring / black o-ring)
Dewitts cut down radiator / cradle at stock height SPAL fans Stock thermostat
LG pro long tubes 1 7/8" with catless x Borla stingers
ECS diff brace Mantic twin disc ceramic with lightened steel flywheel Hurst short shifter Antivenom mod New TOB New stock slave cylinder AEM wideband Autometer boost gauge
Air pump delete / exhaust block off EVAP delete from driver's intake manifold
Vibrant vacuum block to T fitting in brake booster (2 lines to external fuel pump hobbs at 4 psi / 7 psi, 1 line to BOV, 1 to boost gauge, 1 to alky meth kit)
New fluids (diff / trans / oil / clutch / PS) New intake manifold gaskets New valve cover gaskets New water pump gasket New front timing cover gasket New rear main seal
I have considered several options including just sending the LS6 block for a forged rotating assembly, but thought the added cubic inches would be a plus since I'm pulling the motor. Based on some searches, I think the LS2 would be the way to go but am open to other options. I want to keep the LS6 top end and do not want to replace a bunch of items that I recently bought. I hope these parts would transfer over to the new block?
Can I reuse my stock LS6 243 heads and intake manifold on the LS2? Would my LG long tubes fit clearance wise with the new block? Also does the LS1/6 ATI balancer fit the LS2 crank?
What compression should I aim for with 13-14 psi?
Finally, could you tell me what modifications would be required to make this motor fit? I’ve read of a few things including new tap for knock sensors, relocating cam position sensor, new front cover, grind bracket near the engine mount, harness extensions, valley guide, etc… I would plan to buy everything new with a 24x reluctor wheel and not run a Lingenfelter box.
I would plan to do the install myself. I’ve done everything up to this point, aside from the tuning.
Would you all recommend going iron block or sticking with an aluminum block? I would like to stay at the current power level and boost. What are the normal limits of these 2 blocks with a forged assembly?
03-19-2023, 08:37 PM
Supercharged C5 Z06 - Forged Questions 
