Engines that are being pushed hard and making a lot of horsepower need a strong foundation. Filling an engine block’s cooling passages will increase its strength and stability. Rokblock is an engine block filler offered by Competition Products that is better than the old-school method of using concrete to fill a block.

Any space inside an engine block could be a weak point that might fail under extreme conditions. A block that’s been filled will be more stable and allow the cylinder walls to maintain their shape, this will also provide a better environment for the rings to maintain their seal. By increasing the cylinder’s stability, it will help prevent cracking as well.

If you’re going to fill an engine block, you want the block filler to expand into all of the interior voids to provide maximum strength. Brian Adix from Competition Products adds some details about what makes Rokblock a great choice for filling an engine block.

“Rokblock is going to lock permanently into place and not separate from the block. At 70 degrees Fahrenheit, it will take about 30 minutes for the compound to fully set up. The expansion is +.2% at 75 minutes. You can machine Rokblock within 24 hours after it’s been poured into a block.”

Rokblock can be used for either a partial fill or a full fill of any engine block. You can pick up a 25-pound bucket of Rokblock right here on the Competition Products website. If you’re looking for tips on how to use Rokblock you can check out this article here.