21.png
LTR.png
19.png
20.png
22.png
23.png
21.png
LTR.png
19.png
20.png
22.png
23.png

LTR 427 Boost Ready Shortblock

$15,950.00

The Flag LTR shortblock is built to handle up to 2000 horsepower boosted, and can be built NA as well depending on configuration. LTR blocks are dimensionally identical to any factory LT block, meaning this will bolt into an LT powered vehicle as a direct swap. The shortblock is assembled with ACL tri-coated main and rod bearings, and coated camshaft bearings that have been hydraulically installed and burnished for perfect camshaft fitment.

For any questions or modifications please contact us.

The Flag LTR shortblock is built to handle up to 2000 horsepower boosted, and can be built NA as well depending on configuration. LTR blocks are dimensionally identical to any factory LT block, meaning this will bolt into an LT powered vehicle as a direct swap. The shortblock is assembled with ACL tri-coated main and rod bearings, and coated camshaft bearings that have been hydraulically installed and burnished for perfect camshaft fitment.

For any questions or modifications please contact us.

Engine SPecifications

Block:

Fleece Performance LTR Block (2000hp rated)

Connecting Rods:

Manley H-Tuff H-Beam connecting rods with ARP 2000 bolts (1800hp rated)

Crankshaft:

Callies Apex 4340 USA Forged Nitrided 4.000 Stroke (2500hp rated)

Pistons:

CP Carrillo 10.7cc dish forged pistons with .230 wall 9310 upgraded steel wrist pins

Ringpack:

Mahle 1.5mm/1.5mm/3.0mm

Bearings:

ACL tri-coated main and rod bearings

Block Technical Specifications:

Deck Height: 9.251”

Cylinder Bore: 4.110”

Maximum Cylinder Bore Size: 4.185”

Cam Bore: 2.3075"-2.3088"

Lifter Bore: 0.8430"-0.8435"

Main Bore: 2.7475"-2.7485"

Main studs: M10, 8740 alloy (190,000 PSI tensile strength)

Head studs: Threaded for M11 bolts/studs

LTR Features:

Cross-braced lifter valley: Provides added structural integrity and individual drain backs for improved reliability.

Heavy-duty deck thickness: Features a robust 0.750-inch deck thickness for enhanced durability.

Robust design: Includes additional stock to the front and rear valley walls for increased strength along with minimum 0.625-inch skirt wall thickness. Complete reinforced exoskeleton combined with Hot Isostatic Pressing (HIP) ensures the highest quality casting available.

Enhanced main caps: Premium construction ensures stability and precision fitment. Utilizes M10 main studs and side bolts along with dowels on the inner studs of the block for superior clamping and reliability. Exclusive domed main cap design provides for maximum crankshaft support.

Maximized crankshaft saddle radius: Optimized for performance under high-stress conditions.

Lightweight: Weighs only 120 pounds with main caps, offering a strong yet lightweight solution.

Priority Oil System: Oil rifling provides priority oil feed to the critical bottom-end components, reducing heat, wear, and risk of failure.

Ductile iron sleeves: Provide a durable wear-resistant surface with improved shock absorption to handle high-performance applications.

*Horsepower ratings depend on combination and application. If you have a question about parts selection, ratings, or want to discuss your build, please contact us.