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Old 06-10-2017, 04:47 AM   #1 (permalink)
ryanhanson386
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FLATOUT head gaskets

recently been helpin a buddy with his 95 Chevy 3500hd with 6.5L TD... He's been having trouble with head gaskets so he decided to spend a lil extra money n get ARP studs/nuts, n got FLATOUT head gaskets... They are a copper gasket with a clear rubber coating on em. After reassemblin the motor n torquing everything to ARP specs it ran pretty good for about 2 days, then noticed the coolant reservoir was bubblin, the radiator hoses would build up pressure within seconds of runnin. We did some research n tried a few things, thought Rad was clogged or heater core wasn't flowing properly, got a new Rad n bypass heater core n it's STILL building up crazy amounts of pressure, enough to blow lower Rad hose off, even builds pressure without the belt on n cycling water pump.... We are at a loss n not sure what to do.. Any suggestions would be great, hopin the motor doesn't have to come out again, but it's notlookin too good... Any suggestions would be great.. Has anyone ever ran FLATOUT gaskets on their 6.5L? What about making a score in gaskets around cylinders like instructions say?? What purpose does that serve???


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Old 06-10-2017, 09:29 AM   #2 (permalink)
OkDually
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Welcome to the forum.
Never heard of Flatout Gaskets and it sounds to me like they were complete junk.
Time to pull those heads again and do it right

We recommend what's listed in the FAQ, parts list section of the forum.
FelPro (Head Gasket) "Need 2": 9701PT

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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


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Old 06-10-2017, 11:12 AM   #3 (permalink)
ryanhanson386
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Quote:
Originally Posted by OkDually View Post
Welcome to the forum.
Never heard of Flatout Gaskets and it sounds to me like they were complete junk.
Time to pull those heads again and do it right

We recommend what's listed in the FAQ, parts list section of the forum.
FelPro (Head Gasket) "Need 2": 9701PT
I had a feelin that was comin, luckily I know the motor like the back of my hand so pullin it won't be too awful bad.. I'd never heard of FLATOUT gaskets till a few weeks ago, not gonna waste time with those POS ever again.... Well I really do appreciate the help, changin gaskets isn't too bad, could be a lot worse.. Thanks again

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Old 06-10-2017, 12:14 PM   #4 (permalink)
tugboat94
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Victor reiz gaskets were mentioned on several 6.5 site including this one so when I did my heads in January I used them with around studs. Truck runs great 4k miles since heads redone no complaints
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Old 06-10-2017, 12:30 PM   #5 (permalink)
ryanhanson386
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Quote:
Originally Posted by tugboat94 View Post
Victor reiz gaskets were mentioned on several 6.5 site including this one so when I did my heads in January I used them with around studs. Truck runs great 4k miles since heads redone no complaints
What would be the best gaskets to go with?? I'm pretty new to 6.5L, it's definitely a different kinda beast... Started with crate motor came with crank, bearings, pistons, n timing chain assembled.. Rebuild went smoothly, should have figured things were going too good to be true... Prior to installin FLATOUT head gaskets, did some research on em, in many applications it states to use a dremel n make a score around each cylinder before installing, NOT mandatory but recommended... I've NEVER heard of anything like that, What would be the purpose of doin this?? FLATOUT gaskets are smooth copper gaskets with a clear rubber coating.... From what I've heard FLATOUT gaskets are used in high compression or racing motors..... FLATOUT junk gaskets is what they should be called

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Old 06-11-2017, 03:33 AM   #6 (permalink)
ryanhanson386
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FLATOUT gaskets continued

As I suspected, pass side head gasket blew.. Last cylinder next to water passage... Gasket was about to fail next to front passage on same side... Checked driver side gasket n the gasket failed between BOTH middle cylinders which in turn caused motor to make very loud knockin sound... FLATOUT gaskets are from Summit Racing, they do suggest takin gaskets to machine shop n having a fire ring or compression ring engraved in the gaskets themselves to better seal the heads... It's Only suggested does NOT say required..... If ya don't have gaskets engraved, ya don't stand a chance at sealin the heads properly, ya might as well pull motor back out after ya fire it up.. I DO NOT recommend using the FLATOUT head gaskets for the 6.5 from Summit Racing, waste of time n money... Lesson Learned

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Last edited by OkDually; 06-11-2017 at 09:56 AM. Reason: Merged to existing thread on subject.
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Old 06-11-2017, 10:08 AM   #7 (permalink)
OkDually
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Merged your post to the existing thread on the head gasket
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


Proud member #1039 of The 3500 Dually Club

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Old 06-11-2017, 11:10 AM   #8 (permalink)
Sirleitet
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Got pictures of the bad headgasket?
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Mods: Racor 690r fuel filter/w heater, new front face, new radiator and support bushings. Repaired both cab corners & frame. (Rust.)
Relocated PMD, DIY extended wiring harness. # of PMD replaced since owned truck in 2013: 5.
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Old 06-11-2017, 02:39 PM   #9 (permalink)
MyShibby65TD
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Quote:
After reassemblin the motor n torquing everything to ARP specs it ran pretty good for about 2 days, then noticed the coolant reservoir was bubblin, the radiator hoses would build up pressure within seconds of runnin.
For the record, and any future readers, these symptoms are a sure sign of a blown head gasket.

In your research I'm surprised you didn't find anything mentioning the head gasket was bad.

Also, investing in a combustion leak tester would be worth while. It'll tell you if burned exhaust gases have entered the coolant system.

One last thing, did you put sealant on the head bolt threads? Some of them go into water passages.
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Old 06-11-2017, 02:41 PM   #10 (permalink)
ryanhanson386
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Yes used the Right Stuff for bolts goin into water jackets

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