Just realised some of you wont actually now what engine i am running. its a 2.0l sierra twin cam 8v that i fitted a turbo kit to recently. the vauxhall piston are the same bore size and will drip my comp ratio to 8.6:1 instead of about 10.5:1 and they are forged so i can run more boost.

https://passionford.com/forum/viewto...=asc&highlight link to the engine swap when i did it.