A torque plate is an essential tool for anyone serious about building a reliable high-performance engine. When a cylinder head is bolted to an engine block, the clamping force slightly distorts the cylinder bores. Honing without simulating this stress can lead to imperfect bore geometry, resulting in less power and increased PCV pressure because the rings can’t properly seal an out-of-round bore. Some engines are more prone to distortion than others, but they all move to some extent. That’s where a torque plate comes in. By bolting it to the block during the machining and honing process, the cylinder walls are stressed exactly as they will be in the finished engine. This ensures a perfectly round and true bore, giving you maximum ring seal, better efficiency, and long-term durability under load. This plate fits all Subaru EJ20 or EJ25 engine with a maximum bore of 102mm. The EJ20 has a maximum bore of 94mm while the EJ25 have a maximum bore of 102mm. The EJ25 plate can also be used on the EJ20 engine. Bigger/custom bore sizes are available from the drop-down menu, as well as options for larger head bolts/studs. They are CNC-machined from 2″-thick 6061-T6 aluminum. Stainless-steel inserts are included, so the plate can be used repeatedly without damaging the mounting holes. The inserts also give you close-to-stock cylinder-head height so you can use your existing head bolts or studs to torque the plate down. Dowell holes are machined on the bottom side and a single plate can be used on both side. It is suitable for bores up to 102mm for anyone increasing displacement, but it can obviously be used on smaller bores as well. Included; A pair of Honing plate 12x Stainless Steel Spacer This plate will ship to the USA or Canada for Free! Need a plate for another motor not listed? Just contact us!
