What is the front cover / water block casting material? It's not pure
 aluminum is it?

 I was looking at just moving the outlet pipe from the front (where
 the slide throttle would hit it), to welding it where the heater
 stove pipes came out on the side.

 Welder just wanted to know what material is made up of the casting?

 - Matt Boiteau

The alloy is probably 356.
Tig welding on pumps has never been a problem.
I assume you mean a an RX7 and not an RX8.

The lower intake to the pump on the RX8 is the main problem.
Not easy to change that.

Paul Lamar

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