hard block
 

What is this hard block filler I keep hearing about????

I've never heard of this, what have u heard about it? What does it do?

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66' Mustang 2bbl 289 coupe, stock.
79' Mustang soon to be a 302-selling-
89' Bronco 351w
AIRMEN FIRST CLASS
KASPAR T. HOWE

Having not witnessed the context in which you heard it, I may be wrong, but to "hard block" an engine means to add a hardening epoxy to the water jackets, strengthening the block. It reduces the capacity and the effectiveness of the cooling system, but it isn't commonly done to daily drivers. Below is a link to a picture of an engine that threw two rods so violently that the sides of the block were blown out. You can see just how thin and fragile the block really is. The brown area is the water jacket. That's the area where the epoxy goes.

Picture of Broken Block

Take care,
-Chris

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Retired Moderator
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[This message has been edited by PKRWUD (edited 11-07-2001).]