Thread: 6.5 GM Diesel

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Shoot, I hadn't even thought about push rod length, so Erik, what would my compression ratio be, do you have that ability to calculate that?

Originally Posted by TyphoonZR

Shoot, I hadn't even thought about push rod length, so Erik, what would my compression ratio be, do you have that ability to calculate that?

Yes,I do but If you surface the block and heads which you will have a different set of numbers.
Where are the injectors located at?

I am purchasing new bare heads rather than resurfacing, pressure testing etc my old ones. The price difference is only $80.00 each. I am not decking the block other than cleaning it up. My current compression ratio is 21:3 stock, so what gasket thickness do I need to bring that down to close to 18:1? Thanks in advance.

Originally Posted by TyphoonZR

I am purchasing new bare heads rather than resurfacing, pressure testing etc my old ones. The price difference is only $80.00 each. I am not decking the block other than cleaning it up. My current compression ratio is 21:3 stock, so what gasket thickness do I need to bring that down to close to 18:1? Thanks in advance.

I can't find all my formula's.
You will need the inside dia. of the head gasket.
3.14 X radius which is 1/2 the dia. of the dia.of the head gasket squared=area X gasket thicknness.
To convert cubic inches to cubic centimeters.
X 16.387.
One other are to think about is the injector spray pattern and how will the cone spray pattern change and also pressure loss because of the great distance it will travel.

The inside diameter of the holes in the gasket are 4.115. Hopefully that helps.