Amatuer needs help
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Amatuer needs help

  1. #1
    Amm
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    Default Amatuer needs help

    So I finally got my 350 put together and ready to start. Of which I thought was a hydraulic roller vortec engine.

    I go to start it and I already know something is wrong. Sounds like no compression. Sure enough, none of the cylinders have compression.

    I back off on the valve adjustment and I get compression on that cylinder. I do the the following adjustment again:
    1) make sure top dead center for that cylinder
    2) while rotating pushrod, tighten the nut such I feel when the rocker engages.
    3) tighten another 1/2 turn.
    Result: still no compression

    Well I did the same thing, but this time 1/4 turn
    Result: still no compression

    Well I did the same thing, but this time no extra tightening
    Result: compression.

    I know they are roller lifters, what are the odds that I have solid lifters or am I just doing the #2 step wrong or is something else very wrong?

    Any help would be appreciated.

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  3. #2
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    Default Lifters, pump em up?

    Just curious, I remember having to "Pump up" the lifters. What I did was fill a small tin can with oil then repededly pump the top of the lifter with a pushrod, untill it was full. Full meaning it did not compress. After doing this assemble the rest of the engine then prime it using a dummy distributor with the gear teeth machined off. If not the lifters must rely on engine oil pressure to pump them up.

  4. #3
    Senior Member Mash on It's Avatar
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    On a properly adjusted sbc valve, the pushrod will turn pretty easy, and using the "spin the pushrod" method maybe too tight. I feel for zero lash by "jiggling" the pushrod up and down, then 1/8 to 1/4 turn, or .060" preload

    Here is a way to adjust the valves by turning the crank once

    #1 TDC
    EX 1 3 4 8
    IN 1 2 5 7

    #1, 180* out or #6 TDC
    EX 2 5 6 8
    IN 3 4 6 8

    Hope this helps
    Daniel
    Mash on it
    "Never mind the mule, Just load the wagon"
    '76 Eliminator 21'

  5. #4
    Senior Member steele211's Avatar
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    Default

    I went through this same exact thing on a mark IV bbc. I found after some research that it was a solid lifter cam. Lashed the valves as such and fired and ran beautiful. It sounds to me that this might be the case for you as well

  6. #5
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Default

    Quote Originally Posted by Mash on It View Post
    On a properly adjusted sbc valve, the pushrod will turn pretty easy, and using the "spin the pushrod" method maybe too tight. I feel for zero lash by "jiggling" the pushrod up and down, then 1/8 to 1/4 turn, or .060" preload

    Here is a way to adjust the valves by turning the crank once

    #1 TDC
    EX 1 3 4 8
    IN 1 2 5 7

    #1, 180* out or #6 TDC
    EX 2 5 6 8
    IN 3 4 6 8

    Hope this helps
    Daniel
    Mash on it
    wuz gna say you're right about how to adjust the vortec 305 and 350's right up until i noticed you forgot to adjust ex 7 and adjusted 8 twice
    but yeah by the gm book you do the 2 step method on all v8 vortec sbc's

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  7. #6
    Amm
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    Default

    Well, I tore it back down to long block stage so that I could inspect the lifters.

    I put a lifter in a vise between a large socket to hold it and a small socket to apply pressure like the pushrod. Oil started to bleed from the side of the lifter. So it has to be hydraulic lifters.

    In researching this, I noticed my rocker arms did not look quite right. Well, I need 7.122" as opposed 7.724" pushrods. I got those ordered, but then I started to double check other things. My roller cam does not have a mechanical fuel pump provision. Oops.

    Well, anyone want to recommend a camshaft? 350, vortec heads, edlebrock performer dual plane intake. This is going in a twin engine 26' deep vee. It says Scarab on the side of the boat, but I am pretty sure its a Nova. Probably a camshaft similiar to mercruiser's 5.7 HO.

  8. #7
    Senior Member Mash on It's Avatar
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    Default

    Quote Originally Posted by IMPATIENT 1 View Post
    wuz gna say you're right about how to adjust the vortec 305 and 350's right up until i noticed you forgot to adjust ex 7 and adjusted 8 twice
    but yeah by the gm book you do the 2 step method on all v8 vortec sbc's
    oops.......fat fingers

    #1 TDC
    EX 1 3 4 8
    IN 1 2 5 7

    180* out or #6 TDC
    EX 2 5 6 7
    IN 3 4 6 8

    Hope that helps
    Mine has two #8 exhaust valves (better than NO2)

    Mash on it
    Daniel
    "Never mind the mule, Just load the wagon"
    '76 Eliminator 21'

  9. #8
    Senior Member Mash on It's Avatar
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    Quote Originally Posted by Amm View Post
    Well, I tore it back down to long block stage so that I could inspect the lifters.

    My roller cam does not have a mechanical fuel pump provision. Oops.

    Well, anyone want to recommend a camshaft? 350, vortec heads, edlebrock performer dual plane intake. This is going in a twin engine 26' deep vee. It says Scarab on the side of the boat, but I am pretty sure its a Nova. Probably a camshaft similiar to mercruiser's 5.7 HO.
    Do you need a mech fuel pump?
    Try a ZZ4 cam
    Camshaft lift (in): .474 intake / .510 exhaust
    Camshaft duration (@.050 in): 208* intake / 221* exhaust





    OR a LT4 hot cam
    Hot Camshaft (P/N 24502586 Specifications
    Intake Exhaust
    Lobe Lift 0.328” 0.328”
    Valve Lift
    @ 1.5 ratio
    @ 1.6 ratio
    0.492”
    0.525”
    0.492”
    0.525”
    Duration
    @0.050 cam lift 210° 228°




    Thats all I got
    Daniel
    Mash on it
    "Never mind the mule, Just load the wagon"
    '76 Eliminator 21'

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