SKU: ISK100-GRM
MPN: 100GRM
The Groove-O-Matic Block Ringing Tool from ISKY CAMS cuts O-ring grooves into cylinder block decks to lock down head gaskets on engines that see real pressure. It's built for engine builders running superchargers, turbochargers, or high-compression setups where standard gasket sealing gives up. The 100GRM model handles cylinder bore sizes from 3-1/8 to 3-3/4 inches, which puts it in the sport compact and mini engine range. As an o'ring cutter tool, it does one job and does it cleanly: a repeatable groove that gives copper safety wire a positive seat around each bore. Anyone fighting head gasket failures on a boosted combination knows the value of getting this step right.
The tool pilots directly into the cylinder bore and adjusts for both bore diameter and depth of cut, so you set the groove dimension to match your wire and your block. Cobalt cutting blades handle the cast iron and aluminum decks builders work with, holding an edge through repeated passes. ISKY CAMS includes a 1 lb spool of copper safety wire so you have material to ring all the cylinders out of the box, along with complete instructions covering setup and depth settings. The pilot-and-adjust design keeps each groove concentric to the bore rather than referencing off the deck surface, which is what produces consistent crush on the wire when the heads torque down. It belongs alongside other engine-related shop tools on the bench.
Reach for the Groove-O-Matic when you're assembling a boosted or nitrous combination and want insurance against head gasket lift between the cylinders. Set bore diameter, set cut depth, pilot into each bore, cut the groove, then lay in the copper wire before the heads go on. It's a one-time setup per block that pays off every time the engine sees a power adder. Builders working sport compact and mini engines in the 3.125 to 3.750 inch bore range will get the most use out of the 100GRM. Browse the rest of our engine-related tooling and shop equipment to round out a serious engine assembly bench.
The 100GRM model handles cylinder bore sizes from 3-1/8 to 3-3/4 inches, which covers most sport compact and mini engine applications. The tool pilots into the bore and adjusts for diameter within that range, so you dial it to the exact bore you're cutting.
Yes. ISKY CAMS includes a 1 lb spool of copper safety wire along with complete instructions. That gives you enough material to ring all the cylinders on a typical block and a documented setup procedure for bore diameter and cut depth.
O-ringing cuts a groove around each cylinder bore so a copper wire can sit proud of the deck surface. When the head torques down, that wire crushes into the gasket and creates extra clamping pressure right where boosted, turbocharged, and high-compression engines tend to lift the head gasket.
The Groove-O-Matic uses cobalt cutting blades, which hold an edge through repeated passes in both cast iron and aluminum decks. That durability matters when you're cutting four to eight grooves on a single block.
The tool pilots into the cylinder bore itself rather than referencing off the deck, so each groove cuts concentric to the bore. That consistency is what produces even crush on the copper wire when the heads are installed and torqued.
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