Long Blocks

LSXceleration 540HP 383CI 5.3L LM7 Long Block w/ CNC Cathedral Port Heads By ATK This is an LM7 (Iron LS1/LS6) based engine with CNC Ported Cathedral Port Aluminum heads making a very streetable...

LSXceleration 515HP 383CI 5.3L LM7 Long Block w/ CNC Cathedral Port Heads By ATK This is an LM7 (Iron LS1/LS6) based engine with CNC Ported Cathedral Port Aluminum heads making a very streetable...

LSXceleration 500HP 347CI 5.3L LM7 Long Block w/ CNC Cathedral Port Heads By ATK Engine Specifications:• HP: 500• TQ: 450• Block: OE LM7 5.3L Gen III

LSXceleration 600HP 408CI 6.0L Stroker LQ4 Long Block 4.030 58x By ATK This LQ4/408CI Stroker with LS3 Aluminum heads is making 600HP+. Expect big mid to upper end power, will have a noticeable idle...

LSXceleration 505HP 371CI 6.0L 2001-2007 LQ4 Block 24x By ATK This engine was designed to be a performance upgrade for LS based vehicles or perfect for a 2001-2007 Chevy Truck LQ4 or LS swap in a...

LSXceleration 460HP 371CI 6.0L 2001-2007 LQ4 Block 24x By ATK This engine was designed to be a performance upgrade for LS based vehicles or perfect for a 2001-2007 Chevy Truck LQ4 or LS swap in a...

LSXceleration 385HP 330CI 5.3L 1999-2007 Long Block 24x By ATK This engine was designed to be a performance upgrade for a 1999-2007 Chevy Truck LM7 or LS swap in a hot rod. Expect big mid to upper...