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Originally Posted by LT1-DAN  In the Summit advertisement they say this kit will make 515 hp. with 10.5 compression. My question a stock LS1 is not 10.5 compression is it?? |
I actually calculate stock compression around 10.25-1 with stock 67cc heads. With the 64cc heads I calculate around 10.55-1. Most all of our customers have us mill the heads down to 61cc to get close to 11.0-1.