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From the article someone posted before:

"The initial plan was to convert the block material from aluminum (with cast-iron cylinder liners) to iron as a cost-savings measure. That idea was scrapped when weight and fuel economy became an issue, so the final VK56DE V-8 keeps the light-alloy block and head from the parent Infiniti VK45DE design.
In the interests of durability, the forged steel crankshaft supported by cross-bolted main bearings also made the leap. Two features that did not were the exotic titanium valves used to sustain the vehicle's 6,700 rpm redline
To meet torque and power requirements, Nissan engineers stretched bore and stroke dimensions to their practical limits. Boosting the bore from 93 to 98 mm and stroke from 82.7 to 92 mm bumped piston displacement from 4.5 to a more meaty 5.6 liters.
Topping the reconfigured V-8 is an ultra-long-runner composite-plastic intake manifold, the second measure aimed at plumping up the torque curve at the low end where pickup truck owners live and work.
Lowering the compression ratio from 10.5 to 9.8:1 dropped the fuel requirement from premium to regular unleaded.
Nissan hesitates to expose its hand at this stage of the game (Titan doesn't arrive in dealer showrooms until December), 50 output is currently rated "over" 300 horsepower at 4,900 rpm and "375-plus" lb-ft of torque at 3,200 rpm. For reference, the Infiniti V-8 produces 340 horsepower at 6,400 rpm and 333 lbs.-ft. of torque at 4,000 rpm. Dominique adds that 90 percent of peak torque is available from 2,500 rpm to give Titan excellent off-road towing, hauling and driving capabilities."

Looks like the titanium valves gives the Infinity more HP at higher rpm.
I am ok with less hp engine that doesn't require premeium gas :jester:
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