Originally Posted by edvancedengines
I would say to run alcohol or don't use the heads. In this kind of racing application the concrete will probably not be a problem.
I personally can't see ever a reason to do this though.
I have been tempted a few times to fill only the intake side of head with a Hard Block and having the head sit on the intake runners to allow the filler to set up in only that one section of the hed. That was becuase of continual pin hole leaks in intake runner with extremely modified heads.
Ed
Hey Ed,
There's a proccess, called alum impragnation, it done under pressure and vacuum at about 500 degrees and will fill any voids/pin holes or small leasions that are in the material without changing the machine surfaces. It's done all the time in aircraft cast alum. parts and some time forged alum.Aircraft parts.
I spent 20 plus yrs. machining part for AirResearch out West, and they almost always call for that process.
Do a google search and read about it.
Zip.