LT4 heads are for sure better then LT1. They are rotocast aluminum which is stronger and also have stronger titanium intake valves. I also believe they seem to have less core shift issues but I will admit I haven't really seen a lot of info posted about using them as a upgrade for LT1 cars. Part of that could be due to the different intake bolt pattern.
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2016 NFG 1SS A8
Options-2SS Leather/NPP
Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP
Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA
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