Question about 1998 Buick Century

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Which side of the motor on a 3.1 buick 1998 century is the intake side and the exhaust side. I'm installing push rod that are different lenghts and call for exact positioning on the intake side as well as the exhaust side.

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The intake valve is the valve that is centered in the intake port. same for exhaust. the intake is the side towards the center of the engine,

Posted on Dec 11, 2014

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That is a V6 or V8 standard mounted engine. When they say intake side and exhaust side they are talking about the valves. Typically each cylinder has 2 valves the front valve is the intake the back valve is the exhaust.If you haven't already gotten it I highly recommend you get the Haynes or Chilton's repair manual from your vehicle so you have the adjustment specs or priming procedure if you have hydraulic lifters.

Posted on May 20, 2011

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1 Answer

I am replacing the head gasket on my 2000 pontiac grand am 3.4L engine. The push rods got mixed up and i need to know if the shorter rods go on the intake or exhaust side?


As you assemble things, it will become obvious as to whether you're attempting to put in a wrong length push rod. If it is wrong, it will appear that you need to adjust the rocker arm way different than it was originally to make it work. They just will not readily interchange. I think you'll do just fine.

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Lay your pushrods in a row exactly like you removed them and work backwards to install them if you want each pushrod to set with its original lifter.

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You are thinking too hard.

It is VERY simple. The Intake valve push rods (marked with ORANGE paint) are shorter than the exhaust valve push rods (marked with BLUE paint) If you cannot see the paint, you can always stand them up next to each other...it is pretty obvious which ones are which.

BOTH heads are EXACTLY the same - they are interchangeable. It is just that one is turned one way and the other is turned the other way so the exhaust and intake ports will be on the correct sides. (intake port towards the center of engine, exhaust port to the outboard sides of the engine.) You do not need to go searching the internet for some "order". All you have to do is LOOK AT THE HEAD to tell which valve is intake and which valve is exhaust.

So then it is as simple as: Put the short push rods on the intake and the long push rods on the exhaust....

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WHAT IS THE TORQUE ON A 94 BUICK CENTURY 3.1 V6 ON THE INTAKE AND EXHAUST PUSH RODS?


Tightening sequence would be to tighten from the center most bolts to the outer most bolts.
Intake Upper Bolts = 18 lb.ft.
Intake Lower Bolts = 10 lb.ft.
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Hope this helped you ?? if you need more info, get back to me.....

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00 buick century 3.1 70,000mile just had a head job done, car is missing on # 1 and 5 cyclinder, wen i tighten the rocker arms i have no compression, but wen i lossing it then i got compression i change...


There are two different size push rods on that engine. The longer ones are for the exhaust valves. If you have an exhaust push rod switched with an intake push rod it can cause the problem you are describing. Usually you will bend a valve when you get them mixed up.

Jan 23, 2011 | Buick Century Cars & Trucks

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