I am on my fourth season driving my LS1 powered 69 Z/28, I have covered almost 10.000 miles, most of them at highway speed passing many cars. It runs like a dream, mpg as any normal driver. The LS1 engine still has its sparkplugs it came with from the donor car. Only thing I've done to it is one oil/filter change.
All the other guys I know with SBC or BBC are struggling with their engines, can't drive long distances because of 8mpg or that they have some troubles with poor running or broken stuff.
It weighs 3300 lbs empty and runs pretty good for being a untouched 2001 Camaro engine.
Jan
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