Thunder

388/412/428 CID Ford
All Aluminum Dirt Late Model Engine
D3 Cylinder Heads
Complete - Dyno Tested

Lightning

388/414/428 CID Chevrolet
All Aluminum Dirt Late Model Engine
13degrees Dart Cylinder Heads
Complete - Dyno Tested  

414/428 CID Chevrolet
All Aluminum Dirt Late Model Engine
Brodix BD1010 Cylinder Heads
Complete - Dyno Tested