LT1/LT4/LT5 BoostPrep STROKER Shortblock (Gen.V LT)


Bore: 4.070"

Stroke: 4.000"

Connecting Rod Length: 6.125"

Displacement: 6.8L / 416c.i.

Piston Volume: -16cc or -24.5cc dish with valve reliefs

Compression Ratio:

10.9:1 with 59cc(LT1 Heads with -16cc dish pistons)

10.1:1 with 59cc(LT1 Heads with -24.5cc dish pistons)

10.2:1 with 65.5cc(LT4 heads with -16cc dish pistons)

9.4:1 with 65.5cc(LT4 heads with -24.5cc dish pistons)


Horsepower Rating: Up to 1400whp


Engine Block: New OEM LT1/4/5 Aluminum Block

Crankshaft: Callies 8 Counter Weight Magnum Crankshaft

Pistons: Diamond Racing Forged Pistons

Connecting Rods: Callies Ultra Billet H-Beam Connecting rods w/ ARP rod bolts

Main Fasteners: ARP Main Studs

Main Bearings: King XP-Series Race Bearings

Rod Bearings: King XP-Series Race Bearings

Cam Bearings: Durabond one piece bearings


Cylinder Heads: Strictly Spec'd CNC Ported LT1 or optional LT4 Heads


LT1- 2.126" Hollow Stem Steel intake  / 1.590" Sodium Filled Steel exhaust 

LT4- 2.126" Titanium intake / 1.590" Sodium Filled Steel exhaust


Valve Springs: .660" Lift Dual Valve Springs w/ Titanium retainers

Camshaft: Application Specific Spec'd Camshaft

Timing Chain: Katech C5-R Timing Chain

Lifters: OE Replacement LS7 Lifters

Push Rods: 3/8 Diameter Chromoly Pushrods

Rocker Arms: New GM LT Rocker Arms w/ trunnion upgrade

Head Fasteners: ARP Head Studs

Head Gaskets: GM MLS Head Gaskets

Oil Pump: OEM GM Oil Pump


416 STROKER LT1/LT4/LT5 BoostPrep Longblock (Gen.V LT)

Oiling System
Cylinder Head Option


    *We are currently primarily focusing on:
    LS & Gen.V LT (2014+) GM Platforms

    - 5.0L Coyote & 5.2L Voodoo Ford Platforms

    NO General / Non-Performance REPAIRS*

    Monday - Friday | 8am - 5pm (EST)



    383 South Pitcher Street,

    Kalamazoo, MI 49007

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    © 2020 Strictly Performance Motorsports, LLC.

    383 South Pitcher Street, Kalamazoo, MI 49007

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