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Chevrolet's famous "big-block" 454 V8 was introduced in 1970, and replaced the 427 as the top-dog engine option. It's not often that an engine's debut year turns out to be its zenith year, but that certainly was the case with the 454. Besides being an optional workhorse engine for the pedestrian full-size Impala and Caprice, it also powered the Corvette and Chevelle SS in 390 hp LS5 and 450 ... Aug 26, 2011 · The GM 454 (7.4) is a great engine. The basic engine is a real workhorse. The following is just my opinion. I feel that any coach up to 34' is just about the max for a gas engine. 37' might be a little too much for the 454. That being said, if you drive it right it should do the job for you. You might want to take I-80 across Nebraska and Wyoming.

im not positive but i think we got about 11 mpg out of our old suburban. Re: 1997 Chevy Suburban 454 [ Re: jstutz ] #1760960 01/29/10 07:26 PM Joined: Dec 2009