ATK Engines

iTrader: (1)

We are now offering a machined 5.3L Bare block. This is a great option for a fresh build and guys going from an LS1/LS6 to an Iron version. All blocks will be a .030 bore size, NO OTHER OPTIONS AVAILABLE at the moment. I have 9 of these in stock at the moment and they will come as pictured.

$675.00 shipped in the main 48 states. Tax is additional in (TX, CA, MA, WA, MI, FL, GA, MO, KS, IN).

Shoot us a PM or give us a call at 866-721-2315 if you are interested.


Cast Numbers: 358, 392, 393, 398, ETC (1999-2007)
Bore Size: 3.809" (.030 Bore)
Cam Bearings: Installed
Plugs: Installed
Painted: Yes

We DO NOT use a torque plate on the 5.3L Blocks (Nor did GM). The 5.3 with it's small 3.799" bore and thicker cylinder walls is much further away from the head bolt pattern that cylinder distortion is minimal. The 6.0L block with its 4.000" bore does distort enough for us to use a Torque plate on all of our engines/short blocks.

After testing numerous blocks with a Torque Plate bolted down:

The 5.3 only changed around .0001 - .0002
The 6.0 changed .0015 - .002

ATK Engines

iTrader: (1)

Just got informed by my core division that we have an excess amount of these cores so we are knocking the price down to 675.00 SHIPPED! Liftgate service is an extra $50.00