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3100 Pushrod order (98 Monte Carlo LS)

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  • #1

    3100 Pushrod order (98 Monte Carlo LS)

    Hello everyone,

    I'm hoping someone will be able to tell me the pushrod order on my 3.1L 1998 Monte Carlo LS.


    I've been searching around and finally found this forum (excellent info here).

    I also came across this post but don't know if it's correct.
    What is the push-rod placement for a 1996 lumina 3.1 engine? - Answers
    http://wiki.answers.com/Q/What_is_the_push-rod_placement_for_a_1996_lumina_3.1_engine
    The 1996 Chevrolet Lumina had a Model L86 3.1L V6, as did the following vehicles. * 1997-1999 Buick Century * 1994-1996 Buick Regal * 1994-1996 Chevrolet Beretta * 1994-1996 Chevrolet Corsica * 1994-1999 Chevrolet Lumina * 1997-1999 Chevrolet Malibu * 1993-1997 Oldsmobile Cutlass Supreme (1993 received both LH0 and L82 3.1 L motors) * 1994-1999 Pontiac Grand Prix * 1994-1998 Pontiac Grand Am * 1994-1998 Buick Skylark * 1994-1998 Oldsmobile Achieva * 1995-1999 Chevrolet Monte Carlo MY research was for the LG8 3.1L V6, contained in the following vehicles: * 2000-2003 Pontiac Grand Prix SE * 1999-2005 Buick Century * 1999-2003 Chevrolet Malibu * 1999-2001 Chevrolet Lumina (My Vehicle!) * 2002 Chevrolet Lumina (Fleet Vehicle) http://en.wikipedia.org/wiki/GM_60-Degree_V6_engine#Generation_II These vehicles should use the same cylinder heads, about 80% sure. In any case this is what is known by me: The valves that are furthest from the intake, on the outside perimeter of the head, closest to the spark plugs are small diameter valves. These valves use the short rods. The valves that are [non-uniformly] on the interior of the head use the large diameter valves. These valves use the long push rods. This is not due to the diameter, but do to the proximity of the valve on the head with respect to the rod length required to push it. So, looking at a picture of the "front head," closest to the front of the car, from underneath will verify that diameters are small - large - large - small - large - small. Inspecting from above you should note the order of valves as outside - interior - interior - outside - interior - outside. And if you invert that same head to the "rear head" configuration (180o) it would become small - large - small - large - large - small (outside - interior - outside - interior - interior - outside). Here are the pictures I am talking about: http://thedemographic.com/posted/pics/answers-com/lumina_cylinder_head.JPG http://thedemographic.com/posted/pics/answers-com/lumina_cylinder_head_2.JPG So, if you believe I know what I am talking about the ANSWER is this: The rear head (2-4-6) will have push-rods in the following configuration: short - long - short - long - long - short The front head (1-3-5) will have push-rods in the following configuration: short - long - long - short - long - short


    From the above link it seems like he's saying:

    Front head (bumper side)
    Passenger Side: intake - exhaust - exhaust - intake - exhaust - intake : Driver Side

    With the short push rod for the intake and the long push rod for the exhaust this becomes:
    short - long - long - short - long - short

    Read head (firewall side)
    Passenger Side: intake - exhaust - intake -exhaust - exhaust - intake : Driver Side

    Which becomes:
    short - long - short -long - long - short


    Does this sound correct or do I have the order reversed (or completely wrong)?

    Thanks
    Gary
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  • #2
    Here how it is on my 3100 I am working on right now.
    The order as I am looking at the engine with the hood up:

    Pass ---- Toward Rear ----- Driver

    Rear: E,I-E,I-I,E

    Front: E,I-I,E-I,E

    Toward Front
    Last edited by Texasguy; 06-26-2009, 12:16 AM.

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    • #3
      Thanks Texasguy

      I was hoping it would be something like that.
      From memory, it seemed like I put the longer push rods on the outer edges.

      What year and car is 3100 in. I'm assuming most of them use the same heads, but not sure.

      From my searching it looks like this is my head:
      Page not found - American Cylinder Head
      http://www.americancylinderheads.com/cylinder_head-GM-3.1%20or%203.4-liter-_-valve-_-_-side-_-_-AC177C4.html


      Thanks again
      Gary

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      • #4
        Thankfully mine has same sized rods for everything.

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