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04-22-2020, 08:55 PM
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#1
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Name: Nbdiesel
Title: Rookie
Status: Not Here
Join Date: Apr 2020
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Posts: 17
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Head gasket thickness
Ok, doing a rebuild on a truck in just bought. Had the head redone and 6 thousandth taken off and had the block decked 4 thousandth. The previous owner had the head decked when he dropped a valve seat but didn't know how much they took off. Should I get a 10 over or a 20 over head gasket? I know the decking of the block matters for compression but the decking of the head matters for injector location to bowl. I just wonder if he had another 6 thousandth taken off I would be closer to 20 over. My setup is compounds 64/65/12 over s475. 100hp sticks, Hamilton tow cam, springs,studs and HP tuner. Would I feel any lag lowering compression a little bit with a 20 over headgasket?
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04-23-2020, 03:31 AM
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#2
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Name: mhuggler
Title: One piece at a time
Status: Not Here
Join Date: Sep 2007
Location: Uno, Pa.
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Posts: 1,521
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I definitely had a noticeable loss of bottom end response/turbo spoolup with the .020" head gasket. I doubt that you would run into issues with the stock gasket.
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2002 2500 4x4 ETH/DEE-F1 Mach 5's/62/65/12/Smarty/ATS Ex.manifold/AFE intake/TST Comp./.020 marine gasket/o-ringed/ARP studs/5"stacks/Airdog 150/Isspro guages/Southbend 3600 DD/3.54 gears/leveling kit/Bilstein 5100frt,5150rr/37" BFG A/T's on 18" Eagle 114's/Borgeson SS/DSS
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04-23-2020, 06:35 AM
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#3
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Name: YoungDiesel27
Title: Never Enough Time
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Join Date: Jul 2010
Location: West Virginia
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Posts: 825
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Check piston protrusion, to make sure there’s enough clearance to the head. After that make sure to check PTV clearance.
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EFI Live, HP Tuners, Smarty custom tuning
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04-23-2020, 08:20 AM
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#4
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Name: CorneliusRox
Title: Seasoned Rookie
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Join Date: Dec 2012
Location: Detroit, MI
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Posts: 4,154
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Quote:
Originally Posted by YoungDiesel27
Check piston protrusion, to make sure there’s enough clearance to the head. After that make sure to check PTV clearance.
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x2, This is the only way that makes sense. Unless you just want to swing a big hammer and lower compression more than you need to.
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Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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04-24-2020, 10:04 AM
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#5
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Name: Nbdiesel
Title: Rookie
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Thanks, will do the check first. Will let you know the numbers.
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04-24-2020, 06:21 PM
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#6
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Name: spooled05
Title: Too Much Time
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Join Date: Jul 2008
Location: Weatherford ,Tx
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Posts: 832
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Like said , piston protrusion will dictate what thickness you go with . If you know how much total was taken off the head you can get different thickness injector washers to put them back close to the stock location.
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05 q/c 4x4 dually,twins,dual fuelers HP tuners,Flux inj., Mitusa gusher,full billet DTT!
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04-25-2020, 08:50 PM
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#7
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Name: Nbdiesel
Title: Rookie
Status: Not Here
Join Date: Apr 2020
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So measured it out and I'm at .034. So the 1.28mm gasket is recommended according the service manual. So now the question is should I get thicker washer for the injector? I took off .006 thousandth and I don't know what the other head work took off. I tried to search for bigger ones, but couldn't find any. Does anyone know where they make some, and what should you think I get? Or just use stock and it won't affect it much? I worry about the tubes not lining up.
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04-25-2020, 08:55 PM
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#8
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Name: Nbdiesel
Title: Rookie
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Here are two pictures
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04-25-2020, 10:53 PM
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#9
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Name: YoungDiesel27
Title: Never Enough Time
Status: Not Here
Join Date: Jul 2010
Location: West Virginia
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Posts: 825
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That would be too tight of piston to head clearance. Run stock thickness injector washers.
__________________
EFI Live, HP Tuners, Smarty custom tuning
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04-26-2020, 11:32 AM
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#10
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Name: Nbdiesel
Title: Rookie
Status: Not Here
Join Date: Apr 2020
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Posts: 17
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Sorry was going from in to mm. It spec out at .34mm so the service manual says use the thicker gasket if your above .30mm. Out of tolerance is .516mm. So makes sense if they took .004 thousandth off the bock that I would be .34mm of piston protrusion.
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04-26-2020, 03:25 PM
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#11
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Name: T-MAN
Title: misunderstood
Status: Not Here
Join Date: Sep 2008
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Posts: 352
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I'm not critiquing but check piston protrusion from the center line of the wristpin. The piston will rock in the bore.
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2001.5 ppump allison 11.399@ 117.90 6850#
1997 rcsb 12v 6.7 9.38 @ 146.54
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