440bb 40psi cyl6 not firing help!!

[TruckManiaMike]

Just got this motor and it sounded a lil wonky. Might be cammed not sure what’s been done, has a Holley street dominator intake manifold, 600cfm Edelbrock carb, and long tube headers. No fire to cylinder 6 definitely have spark because i used a spark tester at the end of the plug. just did a compression test (cold motor all plugs removed full charged battery throttle wide open tested one cylinder at a time) here’s my results in psi

8-160
6-40
4-120
2-120
1-150
3-90 hears psh noise
5-150
7-170

 

[pnora]

Run a leak down test. You could also pull the valve covers and inspect the valve train. If compression was ok I would be looking at the cap as 3 and 6 are next to each other.

 

[33 IMP]

Squirt some oil into cylinder six and three, and re-run the test. Post results.

 

[Don Frelier]

2 & 4 are kinda low as well.

 

[TruckManiaMike]

Pulled valve covers and found that a pushrod is missing!

 

[TruckManiaMike]

^

 

[icetech]

Pulled valve covers and found that a pushrod is missing!

that will do it for sure

 

[TruckManiaMike]

Not sure where to go from here….easy fix??

 

[dadsbee]

Gotta be in there somewhere!

 

[4speed68rt]

Pull the intake and valley pan and you should find it. Maybe bent or broken. Go from there.

 

[TruckManiaMike]

I see it down in there I will fish it out

 

[Sahara]

I gotta follow this.

 

[TruckManiaMike]

Got it! Still straight! Is it as easy as putting it back in??

 

[Don Frelier]

Should be but why???

Someone couldn't count to 8?

 

[icetech]

pushrods don't just fall into the valley... i would at least make sure the cam lobe is still there, can do that with the intake on..

 

[TruckManiaMike]

How would I do that?

 

[icetech]

How would I do that?

take the rockers off, put that pushrod in and turn the motor by hand and check the lift on the pushrod against a known good one.. gonna have to pull the rockers anyway, won't take much more time

 

[icetech]

I would also get a light and inspect the top of the lifter if you can see it decently to check if the socket is ok, and nothing has come loose

 

[dadsbee]

Pull out the corresponding lifter and have a boo at everything...

 

[TruckManiaMike]

Looks like a lifter popped out!