Not sure what all is taken into account but I know for sure that actual displacement of the engine and compression ratio plays a large part in finding the correct psi. You really need to figure out what the safest psi to run, not the max. Im not a turbo guy but I have learned this much just from hanging around my turbo buddies. Im sure others can be more elaborate.350ztt4 said:How much psi can the v6 block take???