It is a true LT4 virgin block bored 20 over. The shortblock is assembled but the heads and intake are not on it, if you question anything you can look at it before bolting it together.

The motor specs are as follows: ($2500 for just the short block)
LT4 block .020 over (spent 800 on block without machine work)
Cola race crank (stock stroke)
Eagle H beam rods (6.0 in rod)
ARP rod bolts and main studs
Diamond custom pistons (#11130) 10 to 1 depending on heads (they are a forged 2618 aluminum piston's)
*Motor includes oil pan (pictured) and oil pump (pictured)



Heads are Dart 215's fully upgraded ($1750)
They have dual springs for a solid mechanical roller good to in the .700 lift
Titanium retainers
The come assembled with guide plates, one box has been opened to look at it the other is still sealed in the box
Heads cost me over $2k with all the bells and whistles
They also have boost valves in them. 1 piece stainless steel valve.
Additional specs:
Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads Details

Intake Ports: 215cc

Specifications:
Valvetrain: Standard SBC 3/8" stud mount or can be modified to 7/16"
Intake Port Location: Stock
Intake Port Dimensions: 1.190" x 2.075"
Intake Flow: 257 cfm @ .500" lift/28"
Exhaust Port Location: Stock
Exhaust Port Dimensions: 1.410" x 1.350"
Exhaust Flow: 172 cfm @ .500" lift/28"
Manifold: LT-style
Pushrod Length: Stock (should always measure)
Pushrod Guide Plate: Not used (uses stock-type self-aligning rockers)
Retainers: Steel 7°
Stud Girdle: Any standard girdle
Valve Length: 4.890"
Valve Stem Diameter: .3415", 11/32"
Valve Guides: .439" OD Mag-Bronze (.002" press)
Valve Guide Length: 2.100"
Valve Guide Clearance: .0014" to .002" (using Dart .3415" valve stem)
Valve Guide Spacing: Moved .030" from stock
Valve Seats: Hardened Ductile Iron, .006" press
Valve Seat Dimensions: Intake 2.160" x 1.810" x .350", Exhaust 1.650" x 1.350" x .350"
Valve Seat Angles: Intake 32°, 45°, 60°, 70°; Exhaust 37°, 45°, radius


The motor was assembled with the idea of making 800-900 hp and the heads were chosen to support that.

Motors has a 230/236 Blower cam currently installed

Asking $4000 for combo.... much less than what I have in it. I have over 2000 in heads alone, and over 4000 in short block

**Pick up is free. I will meet someone part way for a fee.

Pictures can be seen here. LT4 Virgin Block Forged Short Block for Boost w Dart 215s LT1 SBC Corvette | eBay

 

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