Lt4 Chevy Engine

LT4 Chevy Engine - Series Wrap-Up: Pull!

BBK's 58mm throttle body glides into place with ease-a perfect fit. Summit Racing specified the 58mm piece to jibe with 383ci and a hot hydraulic-roller cam. Take care to remember the hidden vacuum port located beneath the throttle body. We missed and couldn't get the engine to idle on the dyno-caused by a huge vacuum leak. View Related Article

GMC Yukon XL Research

Finding a fuel efficient automobile today is easier than ever. Check out the GMC Yukon XL buyer's guide providing information on car specs, reviews and fuel economy. The 2009 Yukon XL is offered with your choice of V8 engine, and it has a comparable warranty. Other similar vehicles are the Ford F150 and the Ford Expedition.