GM/GEO EPC stated Base Oring size is 55.5mm x 1.9mm ! 89-93' 8v. ( up to 95, im sure') [exactly what I measured on a new seal, btw]
In addition, the 16v uses RTV sealant (O2 sensor safe) to seal the housing to the head . (seals the 16v rail) NO RTV ON ANY 8V housing !
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