40 Delta Flow® - 2.50 Center In / 2.50 Offset Out - Aggressive Sound 1975-checker-marathon-esi5000286 1 - Synthetic - 500

1 - Synthetic - 500 ml - each

Rotating Assembly - 348 CID - Cast Crank - Forged Pistons - 3

Shock - Eliminator Series - Twintube - 12

567 in Insert OD - Chromoly - Black Oxide - Head Bolts - Set of 10

40 Delta Flow® - 2.50 Center In / 2.50 Offset Out - Aggressive Sound 1975-checker-marathon-esi5000286 1 - Synthetic - 500This two chamber design incorporates Flowmaster's Delta Flow technology. The Delta deflectors generate increased scavenging for better performance and reduced interior sound. Milder exterior tone and reduced interior resonance over standard 40 series. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.