I have 2 VG30 engines one is dual cam 4 valve with one turbo and the other is a single cam 2 valve engine with one turbo. What I need to know is the compression ratios for these engines. The SOHC engine I am considering installing it in my 87 Truck with the trucks induction system. and I dont know if the turbo engines compression is lower than the engine that is already in the truck which is a VG30E SOHC. The dual cam engine I will probably sell as it looks too complex of a swap. Thank you in advance.