GM Marine Small Block Compatible 383 c.i. Engine – 405 Horsepower – Long Block

Your BluePrint engine was dyno tested with the parts and specifications listed below.  If you prefer to install a different part, your engine may not produce the horsepower recorded on your dyno sheet.  BP302MAXCT Recommended Fuel Delivery: Carbureted, 600cfm Spark Plug: BPP7938 NGK 7938 BKR5E (.750 inch reach, 14mm thread, 5/8 hex, plug) Spark Plug Gap: .035″ Harmonic Balancer: BPP50 – 50 Ounce, 6.4″ Diameter Flexplate/Flywheel: 50 Ounce Weighted Stall Converter: 1800-2200 rpm Intake Manifold: Dual plane Fuel Recommendation: 91 Octane Timing (Initial/Total Advance): Initial timing – 10-16° and Total timing 32-34° Firing Order: 1,3,7,2,6,5,4,8 Notes: Not for EGR  Engine requires a V-belt standard rotation water pump and belt system. Recommended Break in Oil : BPP710 (Click Here) Recommended Service Oil : BPP10W30 (Click Here)  Recommended Oil Filter ; BPP51515 (Click Here) Total Oil capacity with production oil pan, and Correct BPP51515 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.