Head Gasket experts...check in....

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70aarcuda

70aarcuda

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Head gasket removed from 410 engine ....cylinder 3 and 5 show the gasket egg shaped...cylinder 1 the fire ring was detached from gasket.....any clues?

engine is flat top zero deck 410 cubic inches...with ARP studs....close chamber eddy heads...

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Looks like the gasket was pushed out by block or head not being flat. Looks like compression has caused the fire ring to push out.
 
These gaskets look very familiar to me..........

First question: Is there any signs of detonation on the piston crowns? It is a "maybe" possibility cause
Second question: Is there any evidence of water in the chamber? A drop of water vaporized during combustion can/will raise cylinder pressure high enough to blow gasket out. It is another "maybe" cause.
Third question: Are all the chambers bulged towards the valley? By the pics it looks as though they are.
Fourth question: How does your intake fit? I will guess at the moment (please correct me if I guess wrong ) you use a bead of silicone to seal the intake to the china walls; does it remain a robust bead or does it all get squished out?
Fifth question: How far was the block decked? As in what is the measurement from the crank center line to top of deck?
 
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PRH said:
Use cometics, tq studs to 140 with 30w oil
Click to expand...

My opinion, I see this as a band aid, not a fix..........why from the get go didn't the studs clamp tight enough to prevent the gasket bulge

Still would like to hear from the OP in response to my questions
 
JBurch said:
My opinion, I see this as a band aid, not a fix..........why from the get go didn't the studs clamp tight enough to prevent the gasket bulge

Still would like to hear from the OP in response to my questions
Click to expand...

What brand gaskets are they? It doesn't look like the fire ring was compressed. Improper torque? Head bolts bottoming out in the block?
 
I use the 1008s at up to 11.0cr/ 185psi no problems, also with Eddies, and also up to 34* timing, usually 32* occasionally 39* when I forget to crank back my dial-back timing box .
Don't tell anybody but I reused them a couple of times too; cheapest headgaskets I ever bought,lol.
I tightened them to 100ftlbs on ARP bolts, with their assembly lube, in multiple steps. Engine hasn't been apart since 2004 or 2005, and those gaskets have probably got over 80,000 miles on them........ in total,lol.
IDK why yours puked, but I'm a big fan of those FelPros. The previous non FelPro .028s did just what yours are doing, just not on as many cylinders. I caught it at seasons-end before it lost pressure.
Mine's just a 367 streeter.
EDIT; IDK if it makes a difference but I run a minimum coolant temp of 205*

I think if you flip the heads upside down, they might have a story to tell, and so might the intake gaskets
 
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Actually 100 as per instructions but I went 110 in 3 steps using ARP moly.
 
mbaird said:
will 140 ft lbs harm the block ?
Click to expand...

I'm gonna go wwwwaaayyyy out on a limb here and say that that value exceeds the torque value when the torque plates were put down and now you are distorting your cylinder all over again.............I could be wrong, what say you???
 
JBurch said:
I'm gonna go wwwwaaayyyy out on a limb here and say that that value exceeds the torque value when the torque plates were put down and now you are distorting your cylinder all over again.............I could be wrong, what say you???
Click to expand...

I will join you on that limb...lol
 
It is quite possible that 140ftlbs
Is equal in tensile pull on the block than 110 with arp lube
Torque is really a measurement of thread friction.
That's why the better rod bolts have provisions for a stretch gauge as this takes the friction variable out. As I said imho it depends.
 
Unless OP has massive dynamic cylinder pressure, Ima thinking that this is a massive pressure issue from some other source, such as preignition/ detonation, and 140 ftlbs isn't gonna solve this gasket problem.
While 34* power-timing sounds about right, if perhaps 2* high for the Eddies, mine does not arrive until 3400 rpm. In this way I can burn 87E10 full-time, and my engine has never burned anything else, at the aforementioned 185psi.
 
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