Find the Right LS Pistons in Seconds with Our New Piston Finder

Building or refreshing an LS? Our new LS Piston Finder makes it simple to zero-in on the pistons that match your combo. Set your bore range and desired compression, choose your stroke and rod length, and you’ll instantly get a list of suitable pistons with the key specs. No guesswork. No back-and-forth.

Why you’ll love it

Fast filtering: Bore & Compression sliders, plus single-select Stroke and Rod.
Spec-driven: Results prioritise pistons closest to your target compression, then by bore.
Real-world combos: Works great for common LS builds (408, 416, 427 and more).

How it works

Bore: Use the range sliders to set your min–max bore (inches).
Compression: Set a desired compression range (e.g. 9.5 to 10.8:1).
Stroke & Rod: Pick your exact stroke and rod length from the dropdowns.
Click Find Pistons to see matching parts. Each card shows bore, stroke, rod, compression and notes.

Tips for better results

If you’re flexible on compression, use a wider CR range—results are sorted toward the midpoint of your range.
Unsure on bore? Set a slightly wider range (e.g. +/– 0.010”) to see more shelf options.
Not finding what you need? Try removing induction/availability filters (if present) or widen your ranges.

Try it right here

Need a hand?

Got questions about piston-to-head clearance, quench, or which rod bolts to choose? Our team can help you dial in the combo for your use case (street, strip, boosted, E85, etc.). Contact us and we’ll point you in the right direction.

Shop LS Pistons Online with Confidence

Spool Imports stocks a range of popular LS pistons. Anything we don't have, we can get in our weekly express shipment from CP. By using the Finder tool above, you can compare options and click straight through to order. No more second-guessing part numbers or compatibility.

FAQs

Does the Finder guarantee exact compression?

Compression shown is an estimate based on typical chamber volumes and assumptions. Your final CR will depend on your actual chamber cc, gasket thickness, deck height, and piston dish/dome. We can help you verify before ordering.