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Username Post: 85 305 oil filter question        (Topic#357370)
Mad Professor 
Posts: 104

Reg: 12-30-08
07-25-19 07:31 AM - Post#2771522    

I've got an 85 C10 I'm getting ready to put on the road.

I want to go through the filters and such. I've not played with a 305 but have lots of experience with older 350s.

Question is can you use the longer spin on oil filters on the 305 blocks?

Maybe a part number?

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package

Senior Chevytalk Moderator
Posts: 24929
Loc: Austin, TX 78748
Reg: 05-09-00
07-25-19 04:30 PM - Post#2771567    
    In response to Mad Professor

305 and 350 SB are the same block. There are some rare exceptions. Only bore and stroke are different. The 305 can accept a longer filter as long as it screws on. Carb fuel filters are the same.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles

Super Senior Member
Posts: 3776

Loc: Bedford, Texas, USA
Reg: 11-13-02
07-27-19 12:53 PM - Post#2771726    
    In response to gchemist

STP S373 or equivalent

It is the 2qt big truck filter. Same diameter as a S5 but twice as long. Bottom of the filter will sit even with the bottom of the stock oil pan. Be sure to fill the filter with oil before you screw it on to prevent a dry start. Fill the filter, then put 4 qts in the crankcase. Start the engine and then shut it off. Should be about the right oil level. If not add to the fill line. Reason I say this is the capacity changes and it is no longer 5qts with filter.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals

Edited by 1983G20Van on 07-27-19 12:56 PM. Reason for edit: No reason given.

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