243's on 5.3
#82
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and you can get a set of 243s for /$350-500 bucks. I saw some on ls1tech the other day the guy only wanted $350 for them.
and the 5.3 heads have much smaller valves so even if you ported them, the valves would still hold you back.
#88
TECH Junkie
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I can take pictures of them if you don't believe me. I just got mine last week. They are NEW, not rebuilt. GM valves and yellow LS6 springs. You can't go wrong. I hate buying used heads because all the guys who have 243 heads think they're worth gold and they slap that "corvette tax" on there. Buy new, then you know they've never been molested, dropped, over heated, over revved, etc etc.