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Re: 454 vs. 5.3 efi vs. 5.3 carbed
Quote:
Originally Posted by bloodybigblock
It helps, it kinda makes me ask more questions though. Im thinking my crew (when i make it shortbed) should weigh less than yours. Plus the few 100lbs from a iron BBC to an aluminum headed LS. Im sure it'd weigh under 5k. But your truck is a wee more aerodynamic then mine. Do you think with a tune, CAI,and better flowing exhaust could bring your mpg numbers up?
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 That was with a custom Blackbear 93 Octane tune (no handheld Hypertech junk), long tube headers, no catalytic converters, 2.5" dual exhaust and a K&N FIPK and iridium spark plugs... It went up 1mpg after all the mods. Then I added a Comp LSr 265 cam, and it went back to a little over 17 mpg highway, but I got greedy and added a Yank 2600 stall converter and bye bye fuel mileage (me sliding sideways from every stop light and doing rolling burnouts dont help either...)
I don't see how your truck will weigh much less even with the LS swap, but who knows, even if you do shorten the bed, it's still a 3/4 ton crew cab.
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Adam
1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac
1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's
1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac
2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80
2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac
 
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