So my old compression numbers with the Inline 3mm Headgasket were:

200, 200, 200, 200

After I installed the stock headgasket, drove her for an hour the results were:

257, 255, 264, 257

That seems kinda nuts don't you think? With my same gauge, my old motor was around 235-245 on a stock gasket. This thread wasn't meant to be an issue but kind of a shock. What results are you guys seeing on your motors? By the way, she only has 5,500 miles on her

 

Ive heard 235-245 is very very good so dont complain lol

 

got 250-255ish across the board last time i did mine

 

20,000 miles ago I pulled 240 - 240 - 230 - 240 on stock HG.

 

I just got 275psi in each on this 20k F22.
My last 2 motors with similar miles showed 240-250psi in each. Same gauge, same method, same time of year. I want to get a baseline dyno now.

 

Nice! So this motor is extremely fresh even after its raping over the last 1000 miles lol.

 

i would think the compression should be much higher with the stock head gasket. stock compression is 11.1 and the 3mm gasket drops compression to i think about 8.5.

 

my f22 with over 60k miles of boost was recently put back to stock compression. It made about 185ish Psi across the board and now makes 220ish with a few psi variance between the cylinders. It burns a bit of oil under boost but still idles well and doesn't shoot smoke out the breather. Gotta say its impressive what a good tune and well built motor can do!

 

Wow, unless my gauge reads low, even before boost mine was only in the ~210-215 range.