Which order do the push rods go in for 1999 chevorelet venture , i know there are the intake and exhaust pushrods , but they got mixed up when laid out

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.

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....

Intake pushrods have yellow stripes and are approximately 5.75" long. Exhausts have green stripes and are about 6" long.

Valve arrangement:

Firewall side E-I-E-I-I-E
Radiator side E-I-I-E-I-E

push rods are the same length on a 3.8 motor but not on a 3.3 or a 3.1 motor i can`t quite remember right now.that`s why techs put the pushrods in a peice of cardboard marked which cylinder they have come from.

stand all rods up on a table top, there should be 6 short and 6 long, the short rods go to the intake valves and the long rods go to the exhaust valves.not sure which is the intake and exhaust then with the intake off look into the intake holes if you can see the valve in there then that is the intake valve.

If the engine oil was full of antifreeze when the intake gasket went bad, then there is a good chance that there may be some cam and/or lifter damage. A more likely cause of your problem would be that the push rods got mixed up when you put it back together. The intake and exhaust rods are different lengths. If this is the case, and you have turned the engine over, there is a good chance that you now also have a bent pushrod and intake valve. The exhaust pushrod is the longer one and if you mix them up, the piston will contact the intake valve because it will not be able to close due to the longer pushrod. This will bend or break the pushrod and bend the valve stem.

WHEN ORDER PUSH RODS YOUR INTAKE PUSH RODS LENGH 5 3/4 INCHES , THE EXHAUST PUSH RODS LENGTH 6 INCHES. YOU NEED 8 INTAKE PUSH RODS YOU NEED 8 EXHAUST PUSH RODS. YOU CAN GO TO DEALERSHIP BUY OR AUTO PARTS STORES HAVE THEM.

There are 2 different sizes and if they are mixed up, you will bend valves. Be careful. The intake valves are 5.6" long and the exhaust are 6" long. Tighten the rocker arms down and you're good to go. Let me know if you need anything else.

intate and exhaust push rods are the same size and part numbrer, so nothing will happen, they are both
6.9" overall length

Important: Place the valve train parts in a rack in order to ensure that they are installed in the same location from which they were removed. Intake pushrods measure 144.18 mm (5.68 in) long. Exhaust pushrods measure 152.51 mm (6.0 in) long