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6.2L & 6.5L Performance Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines Related to Performance and Longevity

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  #1  
Old 02-26-2011, 08:05 AM
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Default 6.5 heads

Does anyone know or have tried either double stacking head gaskets or de-stroking a 6.5 to run more boost. I've done it before with small blocks to run turbos and stuff but I dont really know much about the 6.5s and was thinkin about it when I rebuild mine
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  #2  
Old 02-26-2011, 09:55 AM
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well i dont think u can double stack head gaskets i dont think that would work out to well
there may be thicker gaskets available im not sure though

92typhoon937's Sig:1997 cummins 5 spd dually new hauler
1983 chevy 1 ton rollback jerry dan aluminum bed 6.2L diesel
1992 gmc typhoon 36000 orignal miles second owner
1993 gmc typhoon 6.0L and 4l80e acquired now to build it
1991 chevy s-10 daily driver
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  #3  
Old 02-26-2011, 01:11 PM
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thats more of a cheater way to lose compression. if you run too much boost and too thick of gasket you have the risk of blowing the headgasket

Woody35's Sig:1997 Chevy K1500 4X4 EC/SB L56 6.5TD/4L80E
KOJO Tune, GM-8 Turbo gated @ 15 psi, 2100 PSI Pop Pressure Bosch Injectors,
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  #4  
Old 02-28-2011, 03:05 PM
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Ya I know its the cheater way but it was just a though. How about destroking a 6.5, anyone heard of that? Or even if you could stroke one by using a different crank like a 400 crank in a 350 sbc.only reason I'm asking is because I kinda want something different than the normal.
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  #5  
Old 02-28-2011, 03:17 PM
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If you want to know what you can or can't do to a 6.5td talk to Bill Heath at heathdiesel.com He has at least 20 6.5td and some run as high as 35psi boost
I am currently running 15 psi boost with no mods and no problems
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  #6  
Old 02-28-2011, 06:06 PM
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You can't stroke or destroke a 6.5 with out offset grinding a crank. The 6.2 and 6.5 share the same stroke. You don't wan't to lower compression because it moves the top of the piston further from the pre chamber and hurts its ability to function properly.

2MuchJunk's Sig:83 Chevy 4x4 6.2 diesel forged Teflon coated pistons, total seal gap-less rings, balanced, banks turbo when I get motivated enough to put it on, soon to have head studs, main studs, and a fluid damper.
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  #7  
Old 02-28-2011, 08:59 PM
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Alright then, I was just curious because I've done it with other motors but never a diesel. thanks to everyone for their imput
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  #8  
Old 03-03-2011, 01:14 AM
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gm does make different thicknessof headgaskets
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