When you make 1300hp out of a factory cast aluminum block and head there is only one choice, Hard Blok. We have spent 1000's of hours of research and development and the only way our motors could achieve these numbers reliably is with the help of Hard Blok filler.
DEE KARAGIANNIS - NHRA Sportcompact Racing

“I am the owner of a Pro-Stock chevy cavalier that has reached 210 mph in less than seven seconds. I have seen many engine fillers that simply do not make the grade. Believe me, I have tried them all.

Hard Blok water jacket filler gave me more horse power by reducing compression loss. It has even extended the life of my race engine. From now on, I am only going to use Hard Blok.”
JOEL BAYLESS - Pro-Stock IHRA Drag Racing

“We have shown on our in-house Dyno testing that our engines using the HardBlok are substainually more stable in the cylinder blocks which results in less cylinder wall distortion and better ring seals.

The HardBlok water jacket filler has no high heat build up during setting, which promotes less engine distortion.”
MYLON KEASLER - NHRA & IDRC Sport Compact Racing

“I have run HARD BLOK Short Fill Water Jacket Filler for three years in the circle track racing industry. All of my event wins came with no overheating problems.”
TOMMY DEVANEY- Circle Track Racing