Re: 470 riser gasket
>Get the kit from autozone.
>Pressurize the system.
>If does not hold pressure, find the leak
>If leak is not external (where you can see it) check every fitting, hose, gasket etc. Then it is internal, on mine you could actually hear it's gurgling it's way into the cylinders
>Pull plugs and look at top of cylinders (probably #3, and #4). If you can' see it, turn over the motor and look for mist. If there is a good amount in there it will shoot out. I hit my neighbors bedroom window (werent happy but that's a story for another time).
>If it's not leaking into the cylinders and not leaking externally, then maybe the internal seal on the cam / water pump is allowing it to leak inside.
I am certainly not as experienced as some people on here and don't want to lead you down the wrong path. If someone else on this forum has any other advice that is contradictory it won't hurt my feelings. Just trying to help, I have had this same issue this year, and this is what got me through it.
Good luck,
Dave