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TurboTPI

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Well, trans has been good, but I have another problem now. Blew a head gasket this morning. Did a quick pull and it made a weird noise, let off right away, and now it sounds like a spark plug blew out. Limped it to work and sure enough the head gasket is blown out between cyl #1 and #3. So now i get to tear it apart. It has felpro headgaskets with studs. Now do i just throw another set of those in and check the head for warpage or should i go MLS? Never ends, thankfully these things are easy to work on haha
 

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I would figure out why it blew the headgasket first or it's going to blow the next weakest link .
 
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It has been running great, little to no knock even when it was 90+ degrees out. I'm kinda confused why it happened. Is there a certain power level where headgaskets typically become an issue? Im running right about 14lbs of boost.
 

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It has been running great, little to no knock even when it was 90+ degrees out. I'm kinda confused why it happened. Is there a certain power level where headgaskets typically become an issue? Im running right about 14lbs of boost.
L67 gaskets right? They should be fine at 14psi without detonation. Even my L36 gaskets with stock head bolts held on a couple "oops" 16 psi pulls
 

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I had this EXACT same issue with those gaskets though, I think they're just garbage for anything other than stock. Mine blew out in the same spot during a nitrous run.
 
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When I put the heads on the engine, I remember hearing that I should use the L36 (n/a) gaskets. Not sure why. So that’s what i did. It was a long time ago, but multiple people said use the n/a gaskets. Anyone hear this before? Maybe that was BS
 
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TurboTPI

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I had this EXACT same issue with those gaskets though, I think they're just garbage for anything other than stock. Mine blew out in the same spot during a nitrous run.
How’d you remedy that problem?
 

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Huh. Interesting. I wonder what the deal is with all that. I have stock on one side and replacement Felpro L36 on the other.

Whenever I get around doing my L67 swap, I'll probably be studding it with MLS gaskets. Not sure if I'll regret that or not since my current gaskets are working.
 

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How’d you remedy that problem?
So I put another set on, took it to the track (this time turbo'd at about 14lbs of boost) and all of the coolant ended up in the oil. VERY strangely though, because the car ran perfectly fine. We drained the oil and flushed everything out with 2 more oil changes, car ran fine, water system pressurized like it should and the coolant/oil didn't mix. I didn't trust it though because I ran a full 1/4mile with the coolant mixed with the oil as I didn't realize it happened yet. So we put in an L32 with MLS and never looked back.
 
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I went and checked the oil just now, clean, no coolant. So that's a plus. It must be blown where there's no water jackets, no coolant leaking externally, not burning coolant, and no coolant in the oil. Seams to be only leaking from combustion chamber pressure. Kinda weird, but what ever. Ill be taking the head off tonite.
 

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you didn't nuke a piston also right?
 

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I went and checked the oil just now, clean, no coolant. So that's a plus. It must be blown where there's no water jackets, no coolant leaking externally, not burning coolant, and no coolant in the oil. Seams to be only leaking from combustion chamber pressure. Kinda weird, but what ever. Ill be taking the head off tonite.
That's exactly how mine broke in the exact same place. I was able to drive it all the way home from where I was but about 3/4 of the way there pff pff pff pff turned into POP POP POP POP as the rest of the gasket pushed and it was straight leaking combustion.
 

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Mls is usually weaker than stock.

Gm ac delco usually are the best. Victor reinz made them.

Make sure they are for supercharged engines because they have a fire ring to make them more durable.


Head gaskets always blow from detonation. Any little bit of detonation you see results in much higher cylinder pressure than you'll get from making a while bunch of power. I forget the math....it might be exponential...but I think a good rule of thumb is 3x the cylinder pressure from detonation that you would normally see without detonation.
 

v6buicks

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Not to mention that it's better to blow a gasket than a rod or piston. I'd rather keep gaskets as detonation insurance than short blocks.
 

Turbocharged400sbc

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be aware this may be an indicator ofa fuel injector clogged/streaming issue on 1/3 and also that just from an airflow perspective, cyl1 would be more likely to be lean, especially without an IC

graphite over steel core gaskets arent that strong or grippy, they are more for conforming to poor mass production tollerances. the victor gaskets seem to have a more substantial perforated steel "chassis" for the graphite composite along with their more sticky coating.

all of em have fire rings.

make sure to use the newer tq sequence that should come with your bolts/gaskets

mls suck unless they started bagging them BEFORE sticking them next to a shedding piece of cardboard and packaging it
 
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Well, it turns out it was just cyl #3. It was hard to see with it all together. Pistons look fine, so I’m gonna straight edge the head tomorrow at work and see if it’s straight.

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Mls is usually weaker than stock.

Gm ac delco usually are the best. Victor reinz made them.

Make sure they are for supercharged engines because they have a fire ring to make them more durable.


Head gaskets always blow from detonation. Any little bit of detonation you see results in much higher cylinder pressure than you'll get from making a while bunch of power. I forget the math....it might be exponential...but I think a good rule of thumb is 3x the cylinder pressure from detonation that you would normally see without detonation.
I was actually scanning when this happened, it picked up about .8 degrees KR during that pull. But I did notice injector duty cycle was at 95% and the afr went alittle lean. Maybe time for 80lb injectors. 🤦🏻‍♂️ I’ve been scanning for over a month, injector duty cycle never went over 85% before. Maybe this cooler air we are having made the difference.
 

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You on e85?

on 16lbs boost with the m90, I needed to use a BAP with 55# injectors. Fuel pressure wasn’t getting high enough to overcome boost. Made a huge difference for me, tuning was less of a crapshoot. Fuel pressure gauge is a must imho.
 

Turbocharged400sbc

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you popped inside and outside.... did the tq sequence you use involve a final step of the center 4 bolts getting an additional bit of a grunt?

iirc it was the earlier sequence that they did the 3rd step of additional tightening on the 4 center ones, then they discontinued it since it takes too long.

on the arp's i go 88- 90 and the center 4 go to 94

37ftlb and 120* isnt enough unless yer stock
 
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you popped inside and outside.... did the tq sequence you use involve a final step of the center 4 bolts getting an additional bit of a grunt?

iirc it was the earlier sequence that they did the 3rd step of additional tightening on the 4 center ones, then they discontinued it since it takes too long.

on the arp's i go 88- 90 and the center 4 go to 94

37ftlb and 120* isnt enough unless yer stock
Man, i cant remember the sequence or torque. I used arp specs and gm sequence i believe. But yeah, it blew out into the lifter valley also. And i dont remember any additional tightening of the middle 4 studs.
 
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TurboTPI

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Well, back on the road haha. I torqued the studs like mentioned above. 90 ft/lbs and 94ft/lbs on the center 4. Let’s hope this shitbox doesn’t break again for atleast 6 months. I’m currently on like a month and a half average that something breaks. Haha. I’m lowering timing a few degrees to be safe

CEC586D9-0A73-4D8D-8710-EDC9B835317F.jpeg
 

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Deng, nice! Made quick work out of it.
 

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