Blown Head gasket or more? 440 70 Superbee

[JeffreyMopar]

Hello All,
I was driving my 70 Superbee and after stalling at a light I noticed a noise between a click and small knock to the engine not super loud but noticeable like a bad rocker or small knock.

compression Tested all 8 cylinders and all but lovely #6 are performing at minimum 130 psi. #6 is hitting 60 psi at best. #6 spark plug was also wet and oily unlike the rest a bit more dry.

Is this a blown head gasket issue or more? I have only test compression and changed oil. No signs of metal shavings in oil change.

 

[khryslerkid]

Pull the valve cover on that side and inspect rocker, pushrod, spring ect.

If all looks good have a way to put compressed air into that cylinder so you can listen in the carb and tailpipe to hear if you have a burnt or bent valve.

 

[JeffreyMopar]

Pull the valve cover on that side and inspect rocker, pushrod, spring ect.

If all looks good have a way to put compressed air into that cylinder so you can listen in the carb and tailpipe to hear if you have a burnt or bent valve.

Ok thank you for the tip and trick I will try that. If the valve is open won’t you hear the air and it would be functioning as normal? But I guess if it’s closed you’d know if there is a leak.

 

[davek]

Did the car run hot?

 

[JeffreyMopar]

Pull the valve cover on that side and inspect rocker, pushrod, spring ect.

If all looks good have a way to put compressed air into that cylinder so you can listen in the carb and tailpipe to hear if you have a burnt or bent valve.

Whelp you were right! Worse than expected I have lost the push rod and have lots of slack in other rockers. Send help sos

 

[RemCharger]

Is there a hole in the rocker? Have to look see if the lifter blew out/ apart. New lifter( maybe) pushrod and rocker, probably good to go

 

[JeffreyMopar]

Is there a hole in the rocker? Have to look see if the lifter blew out/ apart. New lifter( maybe) pushrod and rocker, probably good to go

No hole in rocker. For sure need all new lifters. Feeling slack in others

 

[davek]

Might not be to bad,I have bent 2 pushrods in my 440 and had no damage to the engine. Slapped two in and all was good.

 

[JeffreyMopar]

Might not be to bad,I have bent 2 pushrods in my 440 and had no damage to the engine. Slapped two in and all was good.

I will hope that! Thanks!

 

[BeepBeepRR]

Worse than expected I have lost the push rod and have lots of slack in other rockers.

What kind of oil do you use in the engine? Lifters alone might not be the answer. If the lifters are taping id expect a lobe or 2 gone on the cam. Take the intake off and inspect the lifters and pull them. Then check out the lobes on your cam.

 

[JeffreyMopar]

Worse than expected I have lost the push rod and have lots of slack in other rockers.

What kind of oil do you use in the engine? Lifters alone might not be the answer. If the lifters are taping id expect a lobe or 2 gone on the cam. Take the intake off and inspect the lifters and pull them. Then check out the lobes on your cam.

Yes will do all of that. Was running 10/40 on an older engine

 

[RemCharger]

No hole in rocker. For sure need all new lifters. Feeling slack in others

If the lifter popped out, there goes all the oil pressure to pump up the other lifters. Take a look down in there.

 

[JeffreyMopar]

If the lifter popped out, there goes all the oil pressure to pump up the other lifters. Take a look down in there.

Yes I’ll disassemble down to the valley and see what’s happening in the lifter cam area

 

[RemCharger]

Yes I’ll disassemble down to the valley and see what’s happening in the lifter cam area

Pop the shishkebob off and just look straight down.

 

[Geoff 2]

Did this happen after you revved out the engine?

 

[jeepthrills01]

I'd like to see cam lobes...was this built during the rash of poorly hardened cores? Or mirror flat lifters?

 

[BeepBeepRR]

Yes will do all of that. Was running 10/40 on an older engine

with zddp? Flat tappet cams need Zinc to stay alive.

 

[ckessel]

Whose oil are you using? Which one?

 

[PRHeads]

Rockers with vertical slop/play in them is not a good sign.