Quote:
Originally Posted by funkhoss
I actually have a 4.3L L99 V8 (with only 40,000 miles) sitting in my shed right now. It would bolt/plug in without any modifications.
I don't think I'm going to swap it, though. If I didn't use the kill switch, it might make a difference, since it uses less fuel at idle. But I never idle, and I can keep the LT1 in roughly the same BSFC range as the L99 by just shifting sooner and keeping the RPM lower.
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A 5.3L running on 4 cylinder (~2.6+L?) might be a bigger jump. I'm guessing your car maybe requires ~25hp at 55mph, and your LT1 makes ~80hp at 1k rpm, which puts you at ~30% load.
Corvette C7 LT1 vs Our LS3 dyno graphs - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
Going to ~60% load might make low speed cruising a lot more efficient if you can tolerate how the engine runs with AFM on.
http://www.tulatech.com/uploads/7/5/...13-01-0359.pdf