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Author Topic:   Hard Blok
posted November 25, 2004 08:13 AM
I am considering using a short fill of hard blok in a 400 SBC for an IMCA Mod.
Is this a good idea or useless?

posted November 25, 2004 02:04 PM
I do it all the time, it works great. Makes the cylinders more rigid and the rings seal better. Most of the heat is generated at the top of the cylinder anyway,so water temp is not a problem. It also raises the oil temp a little by "insulating" the oil from the water some,and most of the time that means more HP as well.

Some people give a "half filled" block extra cylinder clearance...but I dont,I run the standard cylinder clearances for whatever piston I am using, and I have never had a problem.

also, you need to have all of your machine work done AFTER you fill the block or it will be a waste of time.

The downside is that it makes the block a little heavier.

Mark's Racing Engines

[This message has been edited by engineman (edited November 26, 2004).]

posted November 28, 2004 10:48 AM
Thanks for the information.