We don't doubt the toughness of the short-block; Musi told us of several 555s in service that inhale nitrous on a regular basis. Musi tested an earlier version of this engine with an Edelbrock Performer RPM nitrous plate (110 jet) and blasted the 555 to 1,018 hp and a max torque output of 1,140 lb-ft. He was happy to report that the customer still runs the engine after two years of abuse. Musi was also working on a prototype Edelbrock throttle body during our visit. He started with Edelbrock's four-barrel-style universal throttle body and is adding a nitrous port in the center. The nozzle will spray down into the manifold and will be run as a dry-shot of nitrous. That means only nitrous will be sprayed through the system, and the EFI will add the additional fuel required. It will offer a clean look while packing a massive punch-up to 400 hp Musi says.
"We went with a triple nickel because the bigger bore helps the head breathe better. That bore also allows a guy to go with a bigger one if he wears out the engine. The 555 is a really nice combo," Musi says. There is nothing like a joint venture to bring two powerhouses together to deliver a powerful and reliable product.