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#1
05-11-2024, 09:50 PM
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66 GTO oil filter
Can anyone tell me what Wix oil filter fits a 66 GTO. Book says 51049 but it is too long. I tried a 51258 but thread pitch didn't feel right. I took a Fram PH25 off but I cringe at the thought of installing a new one. I know thread pitch is 13/16 16. And the Fram is 4.050 tall.
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#2
05-12-2024, 09:12 AM
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Both the 51049 and the 51258 have 13/16" threads. Wix filter lookup specs the 51049 for a '66 GTO, but the 51258 is a suitable replacement.
Specs for both: Product Specifications Part Number: 51049 UPC Number: 765809510494 Style: Spin-On Lube Filter Service: Lube Type: Full Flow Media: Enhanced Cellulose Height: 5.178(132)* Outer Diameter Top: 3.66(93)* Outer Diameter Bottom: Closed: Thread Size: 13/16-16 By-Pass Valve Setting-PSI: None Beta Ratio: 2/20=6/20 Burst Pressure-PSI: 260 Max Flow Rate: 9-11 GPM Nominal Micron Rating: 21 Product Specifications Part Number: 51258 UPC Number: 765809512580 Style: Spin-On Lube Filter Service: Lube Type: Full Flow Media: Enhanced Cellulose Height: 4.338(110)* Outer Diameter Top: 3.66(93)* Outer Diameter Bottom: Closed: Thread Size: 13/16-16 By-Pass Valve Setting-PSI: None Anti-Drain Back Valve: Yes Beta Ratio: 2/20=6/20 Burst Pressure-PSI: 345 Max Flow Rate: 9-11 GPM Nominal Micron Rating: 21 I highlighted the differences. |
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#3
05-13-2024, 02:47 PM
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I use the Wix 51258 in my '66 with Doug's headers. Great fitment.
 
__________________
 1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
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#4
05-13-2024, 11:21 PM
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I think I now see my issue. It looks like your filter bracket is canted slightly. Mine is straight which puts the filter close to the lower rear A arm bracket.
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#5
05-14-2024, 08:53 AM
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The correct filter adapter is the angled one for a '66 GTO. Somewhere along the road, someone either replaced the OE one for some reason or the block came out of another car that came with the straight adapter.
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#6
05-14-2024, 12:46 PM
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Yes.. It is a 389. Last 4 of block casting is 6769. Thinking block came out of a Catalina or other B body.. I noticed on ZeGermanHams picture the angled adaptor. I'm sure that's my issue.
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#7
05-18-2024, 03:57 AM
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Yes, the 90° filter adapter came on big Pontiacs and the slanted filter adapter on A-bodies.
__________________
Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#8
05-18-2024, 11:47 AM
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Thank you. I received the correct adaptor yesterday, Already on the car and all is good now.
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#9
05-21-2024, 11:57 PM
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Thank you for the purchase
Glad all went well Scott |
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