my poor dead engine

Discussion in 'Big Block Cadillacs' started by richie49, Aug 27, 2018.

  1. Red98422

    Red98422 Active Member

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    Basically it would go from cam and lifter install to a full blown top end rebuild essentially, and it may or may not be necessary in this application. The reason I can’t sway one way or the other would be because I don’t know the failure point of the factory pedestals (RPM vs. spring pressures vs. cam profile). And I would like someone with a setup similar to this to weigh in.
     
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  2. Cadiac

    Cadiac Active Member

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    What vehicle(s) do you drive?:
    94 caprice HiPo, 05 Corvette, 02 Chev 2500 Duramax
    The adjustable shaft rockers mts has are quite good/using two sets. Likely will need some differet pushrods no machining required for those rockers
     
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  3. 48Austin

    48Austin Safty First! Then pull the trigger!

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    Depends on HP and revs you are looking for. Always better to over build for the future. One never knows.
     
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  4. Red98422

    Red98422 Active Member

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    Thank you for the correction on the rocker shafts I had thought (maybe read somewhere?) that the heads would need to be machined but if not then that is excellent news (but damn they ain’t cheap)
     
  5. richie49

    richie49 Active Member

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    Darius
    I have looked but dont have a way to advance the cam.Is the cloyes street set have the 3 keyways?I cant fint pics to see.what is what..Aint this hobby fun........

    Richard richie49
     
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  6. Cadiac

    Cadiac Active Member

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    What vehicle(s) do you drive?:
    94 caprice HiPo, 05 Corvette, 02 Chev 2500 Duramax
    Yes the street and competition sets do have three positions. Straight up 4* retarded and 4* advanced. I believe
     
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  7. robocop

    robocop Member

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    What vehicle(s) do you drive?:
    1987 Cutlass Supreme 2 door with 500 Cad/Turbo 40
    MTS recommended using the shaft rocker system for uses bigger than the MT10.
     
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  8. richie49

    richie49 Active Member

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    Any one know what size tap and plug go to the oil galley that are in the valley? Also if I was to go with shaft rockers ,they are 1:70 and 1:72 ratio ,dont you have to elongate the pushrod holes?
    I really dont think IM going to rev it up more the 10 did which was 48 00 or so rpm.
    Richard richie49
     
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  9. Darius

    Darius Well-Known Member

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    Hello Richard,

    From my standpoint, while the shaft mounted rockers do offer greater potential for RPM (based of course of camshaft selection), the key benefit is in the security factor of not losing one of those 'mouse spring' stock rockers.
    Like you, I don't anticipate high revving power runs. In my case the boost will come in so early that there is really no reason for high RPM blasts, at least not in a car primarily setup for street use.

    Best,

    bro. d
     
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  10. 48Austin

    48Austin Safty First! Then pull the trigger!

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    Like I said "Over build, one never knows"
     
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  11. Red98422

    Red98422 Active Member

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    Or.....“overbuild because you know you can’t trust yourself” (my experience at least)
     
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  12. PJ McCoy

    PJ McCoy Well-Known Member

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    No machining required. Open the pushrod hole a bit you might want more lift in the future. Longer push rods will be needed,
    I have the cadco brand rocker assembly. Its 1.6 ratio, so I dont have to worry about valve clearance.
    The car drives like a cream puff. Smooth great sounding idle with cheapy turbo mufflers. The 40 flow masters series are to much and I will be replacing them with the cheap ones.
    Keep your passing gear connected.
    At 20-30 mph floored, will pin you back in the seat and turn into another creature you will have a hard time trying to identify. Then let off the gas and clam down. Back to cream puff cruiser. I love it. I will not change anything about my cheapy build.
    I straight up love my car/motor combo.
    PJ
     
  13. PJ McCoy

    PJ McCoy Well-Known Member

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    If you keep your rocker tee set up, i would not use the 15 cam. Look up Dave B post in the search box, he used a slow ramp lift that was close to the 25 specs. I believe it was a Howards grind. Going off memory here.
    PJ
     
  14. Darius

    Darius Well-Known Member

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    PJ,

    Reading those words about your engine just tickles my heart. Thanks.:D

    bro. d
     
  15. richie49

    richie49 Active Member

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    P.J.
    Does that rocker system fit under the stock valve covers?
    Did you put in screw in plugs in the oil galleys ,and if you did what size is the plugs for threading the holes.

    Richard richie49
     
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  16. PJ McCoy

    PJ McCoy Well-Known Member

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    I do have stock valve covers. I had to remove the splash guard to make them fit.
    I did not put in the screw in plugs. I bought the caddy complete minus the rad and starter wire. When i pulled the engine i found a rebuild tag near the fuel pump. The motor had around 15k or so before the cam and timing chain swap. I was really blessed from the Caddy Gods. I have found favor.
     
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  17. PJ McCoy

    PJ McCoy Well-Known Member

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    Mine too. Heee heeee heeee.
    Hey thats with the 3.08 gears im sure with the 3.42 it will be even better.
    Heeeeheeeeeheeee
     
  18. PJ McCoy

    PJ McCoy Well-Known Member

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    Sorry about the 25. It should be 15. Referring to the 15 cam specs.
    Pj
     
  19. richie49

    richie49 Active Member

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    well I finally got my parts to start my rebuild. I went with a new mts 15 grind by lunati. I opened up the box and checked the specs. I was under the impression that mt cams came with LSA of 112.
    This cam came ground on a 108 with a center line if advanced will be 104. ITs supposed to be gound with a 4* advance.When I get that far into the engine Im going to degree it to see what its at. I s this a new style for the 15 or was I off about the specs. I know that they have changed for different over the years. A lot of people seem to be going with tighter lsa nowadays.

    Seeing how it that time of the year I have no ideal how long its going to be before the engine is putt back together. MTS shaft rockers are back ordered so not sure of them.

    Richard richie49
     
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  20. Cad Man

    Cad Man Active Member

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    108 Lobe Separation Angle (LSA) and 108 Intake Lobe Center (ICL) are not the same

    112 Lsa ground 4*advanced has a 108 intake lobe center and 104 if you install
    it in the 2* crank sprocket position which is 4* cam..

    If you install it in the Advanced sprocket position with a 104 installed intake lobe Center under at RPM over about 2500 due to chain stretch the cam will retard the 4° I've checked and verified this with a locked out distributor

    Truth is the cam is meant to be installed straight up which is suppose to result in about a 2* advanced when revving

    112 LSA 4* advanced is 108 ILC 116 ELC
     
    Last edited: Dec 16, 2018
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