5.3 heads or ls6 heads?
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alot of people go with ported 5.3s for good flow and lots of compression. if its between stock 5.3s and stock 243s then go with 243s hands down. the 5.3 heads theyre referring to are like prcs stage 2.5 5.3 head from texas speed. or i think hpe has a stage 3 5.3 head. flow almost as good as a 243 ported and also raise the compression usually to around 11:1