just blew my head gasket.

jeremy153624

jeremy153624

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May 10, 2009
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my buddy keeps telling me to run a 20 over head gasket. whats the point in doing this? im going to stud it. why not just run a stock cummins gasket?? thanks for any help
 
thats what i was thinking too. thanks for the input. also has anyone ever delt with puredieselpower for gaskets?
 
How many psi were you pushing? 7x.017 injectors on an HE351 that's absurd.

Make sure the head and block are clean and flat.
 
it was pushing 45psi. it actually cleared up the smoke pretty well. he351's are the way to go for a workstock truck
 
if it wasn't hot when it blew you shouldn't have to worry about decking the head an what not.
 
Heres a youtube link for my dyno run. [ame="http://www.youtube.com/watch?v=LVUlK32z9jA"]http://www.youtube.com/watch?v=LVUlK32z9jA[/ame]
 
Dang, those are some pretty good numbers for a 9cm housing (I didnt know they could handle that kind of volume).....EGT's an issue?

My guess would be that the back pressure from that 9cm at that kind of power could have had a hand in blowing the head gasket since you do have studs......just a throwing out there.

Either way cool project.
 
I dont think the backpressure would be a huge issue really. The housing is only 9cm, but its undivided, which i have heard makes it more like an 11cm, and the gate is setup better than on something like an HX35, which lots of guys have made over 400hp on. If i were serious about pulling my truck, id run an external gate to help out with exhaust flow, but i dont think they are as restrictive as most think.

Jeremy - What kind of boost are you making with your 351? I have mine gated at 38psi for longevity's sake, but i did push it over 50psi once just checking for boost leaks. I decided that wasnt a good idea. :hehe: Nice running truck man.
 
:pop: Interesting......Looks like a need to find one of these used to play with. I was a little worried about back pressure / EGT's, but I know people have made good numbers with it.

Only other issue is they need an adapter to mount to 2 gen manifold .....correct? I dont know if I can afford moving my turbo further away in my chevy unless I am make a custom AC box, think i only have 1.5" in between the two now. I could always flip the manifold and run it like that. Think I have the good clearance.
 
jeremy153624 said:
thats what i was thinking too. thanks for the input. also has anyone ever delt with puredieselpower for gaskets?
Click to expand...

Pure diesel power is cool. I like stock thickness, unless the head or deck needs to be cut. Why not Oring the head while its off?
 
Tpull123 said:
Only other issue is they need an adapter to mount to 2 gen manifold .....correct? I dont know if I can afford moving my turbo further away in my chevy unless I am make a custom AC box, think i only have 1.5" in between the two now. I could always flip the manifold and run it like that. Think I have the good clearance.
Click to expand...

No adapter required for the HE351cw. The 351ve variable geometry turbo does need an adapter, but the HE351cw with the fixed 9cm exhaust housing doesent require any kind of adapter to bolt right up.
 
jeremy153624 said:
It dynoed 468 hp and around 1100 torque. It has a 160 pump on it too.
Click to expand...

What are you running for a lift pump? If it clears the smoke more than it did on the dyno video, I'd say you need more lift pump feed pressure.

Honestly, it looked like it was running out of fuel on the dyno as well.



A few years back on my 99' 24 valve with an He351cw turbo, I made 5-6 dyno runs that were all above 480 HP and the highest run hit 499. I always assumed a 12 valve with the right tuning would be able to make 500+, but I've never seen or read about one.
 
Sounds to me like he was running short on fuel. You can hear it start to sputter at the end of the runs. Mine used to do that before i added my carter pump.
 
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