[DAVID GAGNARD]

Woodz;

I agree,distilled water is the best thing to run in a cooling system,especially with aluminum heads,I have a couple of five gallon buckets on the edge of my shop to catch rain water to use for different thing.........I used to use water out of the faucet when filling my radiators until a good friend that happens to be an FFA mechanic came by one day and asked me what the rain water was for???? Told him and he told me to use it in my vehicles instead of tap water,said he had been using only rain water for the last 20 years with no problems,so being I had it,I began using it,that's the only reason........In my application I have tried with and without anti-freeze and my car does run at least 10 degrees cooler with a gallon of anti-freeze in it............

UT,I would go to Wal Mart and read the back of every brand of anti-freeze they have on the shelf,I think most are very compatible with aluminum heads/intakes/water pumps,and offer some degree of lubricant for water pumps.....or better yet,contact your nearest Chevy dealer and ask what comes in the new Vettes,they have aluminum heads and I think the ZO cars have aluminum blocks............I'm sure GM has done "some" testing regarding the anti-freeze they use in these cars.......

David