Quote: helps it pass emission standards, newer 4.7's have them as well
IIRC, Race 426 Hemi's had dual plugs by the 70's... Must help with a better burn, which would help power and emissions.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph