1984 Coupe DeVille Engine Swap! - Page 5
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 1984 Coupe DeVille Engine Swap! in Past Cadillac Vehicle Discussion; While we are on the topic, splurge on some Royal Purple break in oil for your initial start up/break in. ...
  1. #61
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Re: 1984 Coupe DeVille Engine Swap!

    While we are on the topic, splurge on some Royal Purple break in oil for your initial start up/break in. Your new cam will thank you.

  2. #62
    outsider is offline Cadillac Owners Connoisseur
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    Re: 1984 Coupe DeVille Engine Swap!

    I've heard that royal purple stuff is the best for breaking in an engine...

    Is there any reason why you wouldn't want to use it (other than cost) for day to day use?

    Or would there be any benefit to running some in your engine from time to time?

  3. #63
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    Re: 1984 Coupe DeVille Engine Swap!

    I'd use it all the time in my flat tappet cars if I could afford it...

  4. #64
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    Re: 1984 Coupe DeVille Engine Swap!

    I did soak my lifters in oil before I put them in. So I should be good to go with the valve lash then?

    Hmm, I might just have to splurge and get me some of that Royal Purple! I did some reading up on it, and it sounds like great stuff. What is the proper break-in oil change interval? I know that the engine needs to be spun up to 2-3000 RPM for 20 minutes to break in the cam. I have heard that you are supposed to change the oil after that. Then you break in the engine for 500 miles and then change the oil again. Then you should be good to go/flog on your new engine. Does that sound correct?

    I think I will get that RP oil for both those stages of break-in. I also have a bottle of oil additive that came with my cam. Should I add that to the RP oil on start-up as well?

    Finally, should I run just conventional oil or synthetic after break in for normal use? (I use Valvoline High Mileage in everything. I think it's a synthetic blend.) Thanks guys!

  5. #65
    outsider is offline Cadillac Owners Connoisseur
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    Re: 1984 Coupe DeVille Engine Swap!

    I use valvoline high mileage also! nice

  6. #66
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    Re: 1984 Coupe DeVille Engine Swap!

    Synthetic offers less sludge, but a synthetic blend should do as a nice balance.

  7. #67
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    Re: 1984 Coupe DeVille Engine Swap!

    Use regular oil with the cam additive for the initial break in, then switch to the RP until the first change. Then, regular, not synth, WITH GM EOS for one change until going with full synthetic (with EOS). This is just me, though.

    I think you will be fine with your valve lash. With hydraulic lifters, the lash isn't crucial to have on the numbers. Plenty of people lash by spinning the pushrod while tightening the rocker down until the rod doesn't spin. Start it up, break it in, and if there is rocker noise, pull the covers and tighten up.

  8. #68
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    Re: 1984 Coupe DeVille Engine Swap!

    ^Exactly what I was looking for, Jay. Thanks so much. Might get the (new) engine and trans back in this weekend with accessories. I'm visiting a friend forty minutes north of me at the moment, so I'll update with pics maybe tomorrow.

    Also, can I just go into my local GM dealership and get a bottle of that GM EOS stuff? It comes in a small bottle, right? Offers more ZDDP for the camshaft, I think?

  9. #69
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    Re: 1984 Coupe DeVille Engine Swap!

    I think GM stopped selling the EOS.

  10. #70
    CBodyFan is offline Cadillac Owners Fanatic
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    Re: 1984 Coupe DeVille Engine Swap!

    An Olds 350 is much better than a Cadillac 4.1 but my question would be: how do you get it through emissions?

  11. #71
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    Re: 1984 Coupe DeVille Engine Swap!

    ^My answer for you question is that I live in Michigan. No Emissions Required.

  12. #72
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    Re: 1984 Coupe DeVille Engine Swap!

    I think GM stopped selling the EOS.
    They brought it back with a new part number.

  13. #73
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    Re: 1984 Coupe DeVille Engine Swap!

    Quote Originally Posted by CBodyFan View Post
    An Olds 350 is much better than a Cadillac 4.1 but my question would be: how do you get it through emissions?
    Do what everyone always did in the past here in Indiana: Pay off the inspection station. Old Governor Orr finally got smart on that one and just stopped the inspections, thank God. What a scam all the way around.

  14. #74
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    Re: 1984 Coupe DeVille Engine Swap!

    Emissions, bah! I wish I could run the wagon open headers, just because.

  15. #75
    The-Dullahan is offline Cadillac Owners Master
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    Re: 1984 Coupe DeVille Engine Swap!

    There's no Emissions in FL...

    For that matter Sting and I don't even have to deal with inspections whatsoever.

    The downside of this is that you see cars driving that DEFINITELY are not fit for highway traffic.

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