HT 4100 Camshaft break-in!
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HT4100 4.1, 4.5, 4.9 Discussion, HT 4100 Camshaft break-in! in Cadillac Engine Technical Discussion; Hi! I am planning to change camshaft in my 4100 HT. When i received camshaft from seller there was a ...
  1. #1
    nizki1981 is offline Cadillac Owners Member
    Automobile(s): 1983 Eldorado ht4100
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    HT 4100 Camshaft break-in!

    Hi!

    I am planning to change camshaft in my 4100 HT. When i received camshaft from seller there was a note included i should use zinc additive
    for flat tapped camshaft. Then i have started researching and i have noticed that some people also use zinc paste for cam shaft break-in and also on lifters. What is your opinion, and what type of engine oil should i use after replacement?

    Thanks!

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: HT 4100 Camshaft break-in!

    Use a cam break-in lube paste from any of the cam manufacturers - Comp, Lunati, Engle, Edelbrock - wipe each cam lobe and lifter face with the paste. Lube the cam bearings with 30W engine oil. Oil the cam chain/gears with 30W. Run a HighMileage 10w-30 or a fleet/marine 10W-30 like Shell Rotella, Chevron DELO, Pennzoil LongLife. These all contain higher levels of ZDDP (zinc/phosphorus) additives to prevent flat tappet cam scuffing.

    When the engine is all together, oil pan filled, oil filter prefilled, check timing and start the engine. As soon as you verify oil pressure accelerate the engine to 1500 rpm, NO LOAD, and leave it there for 10 - 15 minutes. This does the initial cam break-in.

    Any cam literature will tell you basically the same procedure. I build Olds 455 and GM 454 boat engines (some are very trick) and if I use a flat tappet cam this is the exact procedure I use - 25 years now, never a problem.

    http://www.drivenracingoil.com/

    Olds 455 bored to 461, 530 hp on 87 octane. Marine conversion..................note the coolant-cooled manifolds.
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  4. #3
    nizki1981 is offline Cadillac Owners Member
    Automobile(s): 1983 Eldorado ht4100
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    Thread Starter
    Thanks for the advice. I will follow your procedure.

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