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PF970C Oil Filter, for 90~95 ZR-1 LT5. UPSIDE DOWN (ON LT5) LABEL VERSION, WITH DURAGUARD. Sold individually. One (1) filter is required per engine. Currently NCRS acceptable with no point deduction.
There is much uncertainty about the correct oil filter label that came on a factory fresh, new ZR-1 Corvette LT5 engine, with most of the uncertainty being for 91 and later models. We can tell you the PF970(no C) was installed on or the 90 model engines and has been documented along with the PF970C on 91, 92, 93, 94 & 95, as well, albiet inconsistently.
For reference, we have a new 94 model crate engine that has a PF970C (without Duraguard) filter, and also have photographs of a new 375hp (90, 91 & 92) engine with the same PF970C filter. Ironically, the 375 hp crate engine oil filter label is "upside down" and the 405hp crate engine is "right side up" when viewed installed on the LT5 engine.
To the best of our knowledge, only the PF970C filter was sold over the counter as a replacement.
NOTE: This is a NOS filter, becoming increasingly difficult to find.