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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7L Performance Parts Discussion
07.5 - 09 3rd Gen 6.7L Performance Parts Discussion Discussion of Performance Parts For the 6.7L Trucks...NO ADVERTISING

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Old 03-31-2013, 10:22 AM   #1 (permalink)
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6.7 cylinder head problem

In june 2012 i installed a new cylinder head built by mountain high performance, couple weeks ago the telltale symptoms of a blown hd gasket appeared so removed head & head has 2 hairline cracks between valves of cylinder #5, can the cracks be repaired or is a new head in my future? thanks for any advice
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Old 03-31-2013, 04:47 PM   #2 (permalink)
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any pics of the cracks? id suggest getting it pressure tested if theres someone near you that can do it. it just depends on where the cracks are at.
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Old 04-01-2013, 10:18 PM   #3 (permalink)
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Mine had about 20 cracks after this past season. I replaced my head with a used one. Don't know if you can see the crack from valve to valve in the pic
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Old 04-01-2013, 10:52 PM   #4 (permalink)
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New head. There are places that repair them, but I wouldnt trust them. If a seat comes loos, its ugly.
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Old 04-03-2013, 06:58 AM   #5 (permalink)
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thanks for the input, i talked to Bill at mountain high performance who built the head & he said the type of cracks in my head are very common & "normal " in almost all heavily modded 6.7's, he said the cracks like mine have to be a half inch deep before reach the water jacket, he said to have head pressure tested & that he's confident the head will test good & if not send him the head & they will fix the cracks, so i am having it pressure & go tested & will go from ther, the stock head i had before one im runningnow had over 12 visible cracks in all cylinders except one & tested no good of course but i have since added compound turbos & lowered my egts by over200 degs
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Old 04-03-2013, 10:19 AM   #6 (permalink)
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does anyone sell a ported and polished head?
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Old 04-03-2013, 08:21 PM   #7 (permalink)
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ednumerous places offer a ported&polished head, but usually takes least 2-3 weeks if not longer to get one
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Old 04-03-2013, 08:39 PM   #8 (permalink)
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I have 156000 on my truck and I beat the hell out of everyday, I know I need studs but was thinking of replacing head, gaskets and installing studs. That way I know I'm safe. I will be upgrading the turbo and Arson III with 100hp injectors. If my head gasket holds out another 6 months I'll do everything at once.

Please recommend a shop that I can send my head to. Im in Louisiana if you know of any in my area.
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Old 04-03-2013, 10:08 PM   #9 (permalink)
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sorry, im in nebraska but maybe some one el closer to louisianna will recomend a reputable shop, this is my 2nd hd gasket with studs but first with head mountain high performance built for me, my cummins is a 08 4dr, ATS stage4 68rfe w5star torquecnvrtr& copilot,ATS compound turbo setup ( which i think is greatest thing since sliced bread) 125hp nozzles, airdog150, bunch of deletes,5in turbo back exhaust:,hiperformance head, autometer gauges, H&S minimax but goin to try EFI Live when get it back together
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Old 04-03-2013, 10:35 PM   #10 (permalink)
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Bigger valves with some bowl blending will gain you more than a port job.

Last edited by JWH_03_Dodge; 05-01-2013 at 11:20 AM. Reason: NSV
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Old 04-06-2013, 01:35 PM   #11 (permalink)
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prostreet2wd i agree, head i been running built by mountain high has oversized valves with bowls blended,, flow increase is substantial
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Old 04-06-2013, 05:51 PM   #12 (permalink)
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Have you driven one with a big single? If you like the ats compounds, youd LOVE one with a big single.
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