Eagle Rods & Crankshafts

What are the best connecting rods for a built WRX, STI, or Evo? When you're raising boost or chasing power beyond what stock internals were designed for, forged connecting rods are one of the first upgrades a serious engine build gets. The Eagle H-beam rods in this collection are forged from 4340 steel and cover the platforms builders actually work with, from Subaru EJ and FA engines to Nissan SR20 and KA24, Mitsubishi's 4G63, and Ford's Coyote V8.

Connecting rods link the pistons to the crankshaft, and they're the part that fails when cylinder pressures outgrow factory hardware. H-beam rods are the classic answer for high-output street and track builds because the H-section profile handles bending loads efficiently at a reasonable price. This collection also includes Eagle's stroker crankshafts, like the 4G63 stroker crank for 7-bolt Mitsubishi Evo 8 and 9 (2003-2006), for builders adding displacement along with strength.

Brands in this collection

Eagle is the specialist behind every part here, and the brand has built its name on affordable forged rotating assemblies. The rod range runs from H-beam sets for the 2002-2014 WRX and 2004-2021 STI, to sets for the BRZ, FR-S, and 86, to Nissan 240SX KA24 and SR20 applications and Ford 4.6L/5.0L Coyote engines (part EAGCRS5933F3D). That breadth lets builders working across Japanese and domestic platforms spec Eagle rods and cranks from the same line, and forged 4340 steel is the spec sheet that matters for boosted applications.

If you're comparing brands, Carrillo is another rod maker with a dedicated collection in the store, and CP Pistons makes the pistons that pair with rods in a complete forged short block. Our turbochargers and engine management collections cover the supporting mods that usually come with an engine build.

Engine work is not a bolt-on job, so plan the build with your tuner or engine shop before ordering. Fitment is listed per product by application, so check your year and model, and confirm bore, stroke, and rod length with your builder.

Frequently asked questions

Do I actually need forged rods?

If you're staying at stock boost with bolt-ons, probably not. Once you add a bigger turbo, raise boost meaningfully, or raise the rev limit, forged rods are cheap insurance against a failure that totals the block.

What's the difference between H-beam and I-beam rods?

Both are forged rod profiles. H-beam rods like these Eagles are the popular choice for high-output street and strip builds because the design handles high cylinder pressures well at a reasonable price. Your engine builder can advise on which suits your power goals.

Do rods require machine work to install?

Yes. Installing rods means a full engine teardown and rebuild, including balancing and clearancing checks. Most builders recommend refreshing bearings, rings, and gaskets at the same time.

Can I run a stroker crank with stock pistons?

No, a stroker crank changes the stroke, so pistons and rods must be matched to the new geometry. Check the product page for the recommended combinations, and confirm your setup with your engine builder.

Featured parts include the Eagle Connecting Rods for 02-14 WRX and 04-21 STI and the Eagle 4G63 Stroker Crankshaft for 7-Bolt Evo 8 & 9 (2003-2006). For build planning, read A Guide to Subaru Engine Modifications on the blog.