What is the push-rod placement for a 1996 lumina 3.1 engine?

Answer 1

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