Max piston protusion

[sweetdiesel]

Whats the max a piston should protrude the deck?

 

[Stingpuller]

Deck height on pistons

Mine are out .028" I run the grade 5 gaskets. I fill that you want the piston as close to but not touching the head as possible. I don't agree with just decking the piston to kill compression in a motor. Jeff

 

[ripmf666]

Mine are out .028" I run the grade 5 gaskets. I fill that you want the piston as close to but not touching the head as possible. I don't agree with just decking the piston to kill compression in a motor. Jeff

Jeff who makes these?

 

[sweetdiesel]

Grade 5? how thick is that?
Grade C i read compressed are 0.0394 and I need to double check but i think the piston is 0.013 above the deck

how much play do i safely have?


Had to edit

 

[WolfLMM]

I think your okay! Im no engine builder though. But a thou and three tenths ain't that much lol.

 

[sweetdiesel]

I think your okay! Im no engine builder though. But a thou and three tenths ain't that much lol.

I know it is ok or it would of I would of broke something

But I could also drop a grade if I have the room

 

[Josh2002cc]

Grade 5? how thick is that?
Grade C i read compressed are 0.0394 and I need to double check but i think the piston is 0.0013 above the deck

how much play do i safelyhave?

You can be out .0129 - .0149 when using grade c gaskets (GM spec) grade b gaskets is .0109 - .0129, and a grade is less than .0109. :angel:

Put that in your pipe and smoke it! Your :welcome2:

 

[S Phinney]

Make sure you check valve to piston clearances when making these type of changes in your motor build. You should have mininum .050 and .070 on intake and exhaust valves respectively. If you use aftermarket cams and deck the heads and block machining valve reliefs in the pistons would be necessary and these clearances are a must do item.

 

[Josh2002cc]

Make sure you check valve to piston clearances when making these type of changes in your motor build. You should have mininum .050 and .070 on intake and exhaust valves respectively. If you use aftermarket cams and deck the heads and block machining valve reliefs in the pistons would be necessary and these clearances are a must do item.

I believe it is more like .080 on intake and .100 on exhaust minimum. Remember this is not a gas motor

 

[codyn]

Jeff who makes these?

gm

 

[Stingpuller]

gaskets

I think they call it grade 5. They are for milled head(decked block) and overbore. Jeff

 

[LBZrcks]

Grade 5? how thick is that?
Grade C i read compressed are 0.0394 and I need to double check but i think the piston is 0.013 above the deck

how much play do i safely have?


Had to edit

I think those might be the gaskets for decked blocks

 

[ripmf666]

Found it they just dont call it grade 5 lol, It's just Block Over-Bored and Deck MilledCylinder Head.http://www.duramaxdiesels.com/forum/showthread.php?t=6148
1)Grade A(2)Grade B(3)Grade C(4)Block Over-Bored(5)Block Over-Bored and Deck MilledCylinder Head Gasket Grade

 

[malibu795]

iirc mine are .006-.007 protusion

 

[Josh2002cc]

What pistons are you running and what gaskets are you using?

 

[malibu795]

.040 cast lb7 C

 

[Redbone]

I believe it is more like .080 on intake and .100 on exhaust minimum. Remember this is not a gas motor

Hey Josh, please elaborate. Do these cylinder temps cause that much more valve growth? Surely there's not that much valve toss.

 

[LBZ]

Henry, do you have thicknesses of each gasket type?

 

[Fingers]

Just the bridge rocking back and forth is worth .050"

 

[sweetdiesel]

Found it they just dont call it grade 5 lol, It's just Block Over-Bored and Deck MilledCylinder Head.http://www.duramaxdiesels.com/forum/showthread.php?t=6148
1)Grade A(2)Grade B(3)Grade C(4)Block Over-Bored(5)Block Over-Bored and Deck MilledCylinder Head Gasket Grade

Henry, do you have thicknesses of each gasket type?

Click on the link Dale