just got a quick question. is this normal for a ls block w/ 84mm je flat top
9:1 piston to have 238 compression on a stock gsr head that has been milled .001. I was expecting somthing like 195 or 200. any intelligent answer is appreciated. The 238 compression seemed a little too high. The piston was and did look like 9:1.

 

Ive had a comp tester throw my stock A6 165 across the board and another shitty one run 195-200. they seem to vary

 

is the block freshly built?

 

What engine was the 9:1 rated for?

The GSR head has quench pads that will raise the compression.

 

engine was 95 ls b18b1 block. block is freshly built by benson.

 

You just have a good Seal thats all!

to Benson!

 

yeah, you are right. Benson did a great job! That's after breaking it in with ACCEL ND SAE 30 oil. Vacuum on it was 23. Motor has 241 miles on it. The rings looked to be seated as well. First 35 miles on it was pure accelerating and decelerating. I might quick throttle response. With lugging. Putting load onto it. The rest was normal driving with occassional smooth acceleration to 7k rpm. The motor runs really well. I will change oil to stock honda 10w30 unitl 750 miles or so then go dyno my car. Everyone thanks for the info. just want to see if anyone had experience with high comp. numbers.