hello! I have an 85 sundancer with twin 190’s. I have been able to get a 165 3.7 core. I want to rebuild the 165 as a spare. And also make it a 190, what are the internal differences in the engines ? What all do I need to do to make the 165 a 190?
and if you want to make the 470 motor produce 190hp and be reliable, you should look into the following modifications:
edelbrock, aluminum head for Ford FE motors - requires you to drill the big hole in the end (this will prevent the thermal expansion issues with the aluminum block and iron head)
port matching the head, manifolds
stabilizing the cylinder bores in the floating bore block. this requires a bit of machining and a custom made block girdle/spider
run only Mercruiser head gaskets (not even Felpro gaskets last on the motor due to the odd block)
make sure you have the larger heat exchanger
the aforementioned 500CFM 4-barrel
Or simply bolt in a 4.3 (however on twin 470's the motors are two close together.)
