Re: Water Jacket ~ Purpose?
I wouldn't drill them out. You want to maintain the proper flow through the block and head. The holes you see in the deck for the water jacket that don't have gasket holes are for removal of casting sand after the block has cooled, along with the freeze plug holes.
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
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