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Thread: engine question

  1. #1

    Default engine question

    hi my names matt im new to this site and have a quick question i have a 1990 suburban 1500 350ci tbi i bought it about 5 months ago and its been sitting im finally getting time for it and went to change the oil i got the 5 qts of oil recomended for it and the oil filter(ph3980) which is a fram the book says and the local parts store says is needed and when i went to take my old one off and noticed a big size diff so i called the parts store back and game them the part number off the old filter and it was the oil filter that goes on the 454(7.4l) so i went and got the new fram filter(ph5) and it worked fine but now it takes 6 qts of oi.l is it possible that someone swapped the oil filter housing out to a bigger one and why if possible would they do this or idid someone swap the motor for a 454 and how do i tell

  2. #2
    Sr. Mechanic
    kburb's Avatar
    Join Date
    May 2010
    Blythewood SC


    Anything is possible but my 91 does use a PH5 filter and holds 6 QTS. you should be able to tell by the trans. i believe you should have a 700r trans. to tell look at the number of bolts and for the cover. if you do have a 700r i would bet solid money that you have a 5.7L 350. The 454's did not come with the 700r trans.

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    here are a couple of attachments that may help you.

    Good luck

    91 Suburban

    D44/14BFF w/Disc conv - Yukon 4:88's - Yukon Grizzly Lockers F/R -13" lift - DIY4x Shackle Flip - 37 ATZ on 18 MT Classics - Doug Thorley headers - Magnaflow - Holley Pro Jection Intake - Ultimate TBI mods - Hydroboost Brake Conversion - Hysteer-X Over Conversion.

    (Coming up - Fuel Injected 383 Stroker - Divorced NP205 - D60 - 40" tires)

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