Advice on valve spring height, load on a L98 383

Discussion in 'Engine: Repairs and Modifications & generally corv' started by Tor Arne Kaasen, Jun 9, 2018.

  1. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    See if you can find Vavoline VR-1 20w50 Racing oil there.
    Its for HOT WEATHER USE ONLY.
    80 F to 120 F outside air temps.
    Has lots of Zinc and Moly Anti Wear Additives.

    CASTROL GTX HAS A SPECIAL EUROPE SPEC OIL NOT AVAILABLE IN THE USA.
    20W60. MADE FOR HIGH REV GERMAN TURBO ENGINES.
    GOOD STUFF.

    Otherwise use a Zinc Replament additive added to 10w30 oil.
    ZDDP additive found here.
    And LUCAS Zinc additive in a small 4 ounce bottle.
     
  2. Tor Arne Kaasen

    Tor Arne Kaasen New Member

    He he. the ouside temp all year round i 50F
    I have talked with castrol and valvoline
    Castrol recomended Castrol GTX 10W-40 A3B4 asked for how much ppm zddp it was in the oil. could not answer.

    valvoline :
    "Extra ZDDP we have in our VR1 Racing oils.
    These are available in 20W-50 (mineral), in 10W-60 (semi-synthetic) and 5W-50 (full-synthetic).

    In our recommendations on the Chevrolet 1984/85, viscosity is 10W-40 or 20W-50.
    With this as a background, I would recommend the VR1 Racing 20W-50.

    If you get closer to the specified viscosities, the 5W-50 will be an option - but it's synthetic. I would check that it was OK at first."


    I have bought 1 bottle of addition from Comp Cams and 2 bottles from STP with Zddp.
     
  3. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Its too cold where you live for 20w50.

    You Need 10w30 Oil for 50 F & Colder.

    10W40 works flows best 75-90 F temps outside.
    Thick Oil just does not flow on cold engine startups in Cool or cold weather.
    Severe wear will take place on the Engine Main & Rod Bearings.

    I use Castrol 10w30 Edge Full Synthetic in my cars and trucks here in the USA.

    My 1963 Pontiac Grand Prix with its 1965 Oldsmobile 425 Engine I transplanted in I use Conventional Castrol 10w30 .
    I used to use GM EOS all the time.
    I quit using it about 1-1/2 years back.
    Was using Castrol 10w30 Edge in it.
    It runs fine on Conventional Castrol 10w30 .
    No Flat tappet cam issues.

    Comp cams has a terrible rap for Cam Lobes going bad flat.
    Flat Tappet & Roller cams.
    Be sure to add ZDDP.

    STP has hardly any Zinc left in it.
    US EPA made them take nearly all out.
     

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