When you take them out it's a good idea to keep them in a certian order that you will remember but im guessing that you didnt. its not really a big deal, just put them back in however it shouldnt hurt anything
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Do you have the 2.2 liter Ecotec 4-cylinder engine, the 3.5 liter V6, or the 3.9 liter V6 engine? If you have the 2.2 liter engine, there may be a camshaft/timing chain issue if you skipped a tooth when you put the chain back on the cams. If it's a 3.5 or a 3.9 liter V6, you may have incorrectly installed the push rods back into the engine. 3.5 liter intake push rods are approx 5 3/4" long, while the exhaust push rods are approx 6" long. The 3.9 liter intake push rods are approx 5.81" long, while the exhaust push rods are approx 6.1" long. If you mix the two lengths up when you put them back in the engine, you're going to have problems.
Push rod,you have two different size,or firing order is wrong. The intake push rod are 5 3/4 inch long, the exhaust are 6 inches long,Disable the spark and crank the engine the sound should be smooth and even,if its not correct the push rods.If it is correct the firing order
Im not sure what year, make or model car this is, the most common reason for a no start after an intake gasket chage is due to installing push rod in the wrong spot, this is mainly ture on the 3.1 and 3.4 and 2.8 and some other engines, the intake and exhaust push rods are diffrent sizes, i belive the exhaust valve uses a little longer pushrod than the intake, remove the valve cover and remove loosen the rocker arm and pull the first two push rods out, see if they are diffrent sizes, if so then install them in the correct location,let me know the result good day.
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.
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).
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
remove all accessories from front of engine -alt and ps pump,then drain cooling system ,remove upper intake- remove valve covers then lower intake.Then take out push rods to remove gasket(keep push rods in order as exhaust rods ar longer-will bend valves if installed wrong-get a piece or card board and punch in 12 holes 6and 6opposite each other,then put push rods in it)please not their is an updated gasket set from FEL PRO that has all you need to repair the problem with updates torque specs for lower manifold in the box REMEMBER change motor oil befor starting-you can even pour a little oil onto lifters before putting lower back this is to get any coolant from upper block to run into pan before oil change,if not knocking will occur in the next week
when u bent the push rod u might have bent the valve in the head ,by puting the longer push rod where it didnt belong it kept the valve open when the piston came up and the force of the piston on the valve bent the push rod,you will have to remove the head,hope this helps