you might want to do some research on the rb series...........they rb26 is known to make 1000 hp and crank it over to 10,000 rpms w/ valve springs and stock block...........hence why do you think in japan they put them in supras!!!!!!!!!! the rb26 is probably the strongest engine ever made/production of course! remember stock redline is over 1000 rpms higher on the rb26 8000 compared to 6800! you dont here them sticking the 2jz in the skyline now do ya? infact the supra owners over there are also known for ditching the 2jz for the twin turbo l4............hmmmm