50 State Legal Replacement 1978-1988 - GM SB Compatible 350 c.i. Engine - Long Block

50 State Legal Replacement 1978-1988 - GM SB Compatible 350 c.i. Engine - Long Block

SKU: G3508088

50 State Legal Replacement 1978-1988 - GM SB Compatible 350 c.i. Engine - Long Block

SKU: G3508088

HP & Torque: OEM

Cylinder Heads: Perimiter Bolt Iron

Compression Ratio: OEM

Camshaft: Hydraulic Flat Tappet - .390 Intake / .409 Exhaust Lift and 194 Intake / 202 Exhaust Duration @ .050

Pistons: Hypereutectic

Crankshaft: Steel Crank - 3.480" Stroke and 5.700" Rods

Regular price $4,799.00
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This engine is designed and manufactured to factory specs for the specified vehicles below. It's manufactured using tighter machining tolerances, higher quality components, and finer balancing of the rotating assembly to make this engine better than the original while still meeting the description of a “replacement” engine.

View the Application List HERE


  • NEW BluePrint Block
  • 4-Bolt Main
  • 4.000" Bore
  • 1-Piece Rear Main Seal
  • Mech fuel pump provision: Yes
  • Passenger Side Dipstick
  • Drilled and tapped for clutch linkage

Rotating Assembly:

  • Cast Steel Crankshaft
  • 3.480" Stroke
  • Forged 5.700" connecting rods
  • OEM Spec Pistons
  • Internal Front/ External Rear

Cylinder Heads:

  • Perimeter Bolt Iron Cylinder Heads

Cam Specs:

  • Cam Type: Hydraulic Flat Tappet
  • OEM Spec per listed vehicles

Ignition Timing:

  • OEM Specifications

Also Includes:

  • New valve covers
  • Oil pan
  • Timing cover
  • Harmonic Balancer


  • Designed as factory replacement long block for specified vehicles and year ranges, using OEM specification parts. Customer to re-use existing intake manifold, ecu (if equipped), exhaust, fuel system etc. Modification or replacement of provided tinware, and minor accommodations such as dipstick location may be required. 
  • Specifically designed as an OEM spec engine to meet emissions requirements of the specified vehicles, to meet the criteria of "replacement engine" in all 50 states. 
  • If your vehicle was originally equipped with a 2-piece rear main seal crankshaft, a new flex plate or flywheel will be required. Note for those same early applications, this block features the dipstick on the Passenger side. 
  • Must verify with application list linked above for fitment.

    Part Number: G3508088

    Fuel Delivery Type: OEM GM TBI and ECU

    Spark Plug: ACDELCO CR43TS

    Spark Plug Gap: .035"

    Harmonic Balancer: BPP350 - Non Weighted, 8" diameter

    Flexplate/Flywheel: Late 350 Weighted

    Stall Converter: OEM

    Fuel Recommendation: 87 Octane

    Timing (Initial/Total Advance): Controlled by OEM ECU

    Firing Order: 1,8,4,3,6,5,7,2

    Recommended Break in Oil : BPP710 (Click Here)

    Recommended Service Oil : BPP10W30 (Click Here) 

    Recommended Oil Filter ; BPP51061 (Click Here)

    Total Oil capacity with production oil pan, and Correct BPP51061 Filter : 5 Quarts

    Header Partners: 
    Click here for our Header Partners and recommendations.

    Click here to download a copy of the Installation Guide that came with your BluePrint engine.


    The satisfaction of our customers is our highest priority at BluePrint Engines. We use quality components to balance your engine's rotating assembly within two grams of spec. We dyno test your crate engine and certify that it's ready to deliver horsepower and torque.

    We give your BluePrint engine the industry's best-in-class warranty for 30-months / 50,000 miles — with the extra confidence only BluePrint can provide. Our warranty applies to individual or professional installations and is fully transferable.

    For a detailed overview of our warranty, click here.

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