Rokblock, Professional Engine Block Filler, 25 lbs ...
Rokblock, Professional Engine Block Filler, 25 lbs. The most advanced block filler on the market today. Designed to expand into all interior voids. Helps prevent cylinder wall cracking and keeps cylinder walls round which will improve ring seal. 98 cured within 24 hours. 24 hours after filling with Rokblock, the block is ready for all machine work.