Manufacturer reference photos may show other components. Your order includes the sale unit described here.
Mahle · New
Mahle MS Piston Set BBF 544ci 4.39in Bore 4.5in Stroke 6.7in Rod 0.990 Pin -38cc 9.7 CR Set of 8
MPN 930245690 · Store SKU mhl930245690
Sold as one set of 8.
Supplier stock checked 11/8/2026, 3:41:06 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
521cid 4.390 x 1.350CH, 4.300stroke,6.800rod,0.990pin,-38cc,506g,9.3CR, 4032 Piston (set) - BIG BLOCK FORD
Manufacturer fitment & guides
- Ford Big Block 521 cu in.
- Manufacturer-supplied application summary from Turn14; this may not be an exhaustive fitment list.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
- Emissions acknowledgement required before purchase.
- California Proposition 65: Y