| Brand: | Speedmaster |
| Part Number: | 1-286-015-01 |
| Part Type: | Engines, Bare Block |
| Block Material: | A-356 Aluminum |
| Cylinder Bore Diameter: | 4.000 to 4.125 |
| Bore & Stroke: | 4.155 in. x 4.000 in. Max Recommended |
| Cam Journal OD: | Standard SBC - 1.869 |
| Cam Plug: | 2.375 in. Dia. Cup Plug |
| Cylinder Wall Thickness: | 0.275 in. min @ 4.155 in. Bore |
| Deck Height: | 9.025 in. |
| Deck Thickness: | 0.675 in. Min |
| Fuel Pump : | Electric Only |
| Fuel Pump Pushrod: | n/a |
| Freeze Plugs: | 10 x 1-5/8 in. Press In Cup Plugs |
| Lifter Bores: | SBC 0.8427-0.8437 in. |
| Main Bearing Size: | 2.450 in. (SBC 350) |
| Main Bearing Bore: | 2.649 in. (SBC 350) |
| Main Cap Bolts: | #1 7/16 in. (2) 3/8 in. (2) #2, 3, 4 7/16 (2) Splayed (2) #5 7/16 in. (2) 3/8 in. (2) |
| Main Cap Press: | 0.005 in. |
| Main Caps: | All 5 Billet Steel. 3 Center Caps Splayed |
| Main Cap Register: | Deep Stepped Register (No Need for Dowels) |
| Oil System: | Wet Sump - Main Priority Oiling (Can Use Dry Sump) |
| Oil Pump Shaft: | 350 0.481 in. OD - Standard |
| Oil Filter: | SBC, Uses 2 Bolt Adapter |
| Oil Pan: | Standard 350 SBC |
| Rear Main Seal: | Standard 350 SBC - 2pc |
| Serial No. Location: | n/a |
| Starter: | Dual Bolt Pattern |
| Stud Holes, Head: | Blind Holes |
| Timing Chain/Gears: | Standard SBC Components |
| Timing Cover: | Standard Cam Location SBC |
| Torque Specs: | 1 - 5 7/16 in. Bolts 65 ft. lbs. 1 & 5 3/8 in. Bolts - 35 ft. lbs. |
| Weight: | 110 Lbs @ 4.0 in. Bore |
| Quantity: | Sold individually. |
| Notes: | Check hood clearance before installing. |
If your standard Bowtie block could handle 1000+ HP it would be Speedmaster's AH1 engine block. Design from the ground up based upon your favourite bowtie block with the ability to handle naturally aspirated, supercharged, turbocharged and nitrous applications. The Speedmaster AH1 is the perfect starting point for a powerful and reliable engine build suited for the street or race track. Precision pre-machining is the perfect starting point for a powerful and reliable engine eliminating time and expense of blueprinting a stock block or ''semi-finished'' factory casting. Best of all can be used with standard off the shelf small block components.Speedmaster AH1 Chevy SBC bare blocks feature:Cast A356-T6 Aerospace AluminumStandard deck height allows the use of off the shelf partsUses standard small block Camshaft, Timing Chain, Oil pump, Oil filter, Motor Mounts. sold as is
