need help with new model

hey im tired of the same old easy engine motor models is there already a site that has engine models to chose from cause i would like to see modelers making v8, 4 cyl, Chevy small blocks, and like for the boat motors real life looking board motors shit like that but if there is a site please let me kno and if there is no replacement models at all can some one start making some i don’t have source sdk and i would really appreciate it thank you