ATK Engines

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ATK HP is offering a new engine package based off the cast iron LM7 5.3 block. This engine produced 547HP/510TQ on the latest dyno session! It will come as a bare long block, but can be completed with an EFI or Carb setup as well. Other camshaft/power options available depending on application. Long block will have a special introductory price for LS1TECH members for $6475.00 and FREE SHIPPING in the main 48 states!



Iron LM7 5.3 block 3.903" bore
K1 4340 Forged 4.000" crankshaft 24 or 58 tooth
Scat I Beam Rods with ARP 8740 bolts
Wiseco Forged pistons with GFX Steel top ring 10.4:1 compression
CNC Ported core heads (#862 or #706) Stainless steel valves/titanium retainers, .650" lift springs
ARP Head bolts
Stock rockers with Trunion upgrade
LS7 Lifters
Custom Hyd. Roller Cam
ATK 5/16 .080 wall pushrods
Melling High Pressure oil pump
King XP Bearings
Billet .250 Seamless Roller Chain