some people seem to love them, others hate them....why?

 

Im not sure, but I read somewhere that you have to heat the block while installing them in order to keep from damaging it. That might have something to do with it, and maybe that some people feel its only a bandaid if you will.

 

I would rather lay my nuts on a hot stove while getting my nipples pierced with a steak knife than use a blockguard in any of my motors.

I had a bad experience with them and I don't care to talk about it anymore.
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concrete works better

 

just fill up your cooling jacket with JB WELD

 

Or get a solid deck block, hehe.
Why do car makers even make open deck blocks?

 

Its cost effective, cars are designed by accountants not engineers

 

I guess saving 500 grams of aluminum on one car makes for 500 tons on a million cars.

 

they block off coolant flow from the tops of the cyl.

 

there are block guards with holes drilled through the brace to allow for coolant to pass through. anyone used those?