Callies APEX LS Crankshaft

Callies APEX LS Crankshaft

For LS builds that demand serious strength, smooth balance, and reliable performance, the APEX delivers. This crank is tailor-made for performance engines that make big power, live under boost or nitrous, or spin high RPMs.

Specs & Features:

-Stroke: 4.000″ to 4.250" — great choice for larger LS displacement combos up to 468ci

-Main Journal Diameter: 2.559″ — standard LS main size

-Rod Journal Diameter: 2.100"

-Reluctor Options: 58X

-Balance: Internal — smoother operation, better bearing life. APEX series fully counterweighted

-Material & Treatments: Forged 4340 steel; heat treatment with Perma-Case deep nitride; gun-drilled mains; all rod journals lightened for weight savings without sacrificing strength

Why It Stands Out:

If you’re building a powerplant that will see high levels of boost, high RPMs, or heavy loads, this crank gives you the durability you need. The APEX blends robust materials, modern machining, and balance features so you can push harder without worrying about crank flex, fatigue, or bearing stress. Whether you’re racing, frequently launching or just pushing your LS near its limits, it’s a foundation part built to last.

Siebert Performance Tip: Pair this crank with Callies Ultra rods and quality Wiseco forged pistons for a rotating assembly that's proven to win.