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#2
10-12-2024, 02:52 AM
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They all came closed chamber from GM. I have had many sets that we opened up to the open chamber design.
Those also had the extra(ZL1) head bolt boss added to the underside. The later service heads had no plugs on either end. Jason Last edited by SuperNovaSS; 10-12-2024 at 02:54 AM. 
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Jimlt4383 (10-15-2024) | ||
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BLACKLS5 
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