Chevy SBC 400 B-4.125 M-400 DH-9.025 4-Bolt Billet Main Bare Iron Engine Block

If your standard Bowtie block could handle 1500+ HP it would be Speedmaster's H1 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.

Brand:	Speedmaster
Part Number:	1-286-011-01
Part Type:	Engines, Bare Block
Cylinder Bore Diameter:	4.125 in.
Bore & Stroke:	4.185 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 @ 4.185 in. Bore
Deck Height:	9.025 in.
Deck Thickness:	0.675 in. Min
Fuel Pump :	Standard Mechanical Provision
Fuel Pump Pushrod:	Standard Length
Freeze Plugs:	10 x 1-5/8 in. Press In Cup Plugs
Lifter Bores:	SBC 0.8427-0.8437 in.
Main Bearing Size:	2.650 in. (SBC 400)
Main Bearing Bore:	2.849 in. (SBC 400)
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 SBC
Rear Main Seal:	400 Main FelPro# 2909
Serial No. Location:	Laft Front & Main Caps
Starter:	Standard SBC
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:	205 Lbs @ 4.0 in. Bore
Quantity:	Sold individually.
Notes:	Cam Bearings not Included, Replaces Dart 31182211

The Speedmaster H1 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 H1 Chevy SBC bare blocks feature: 
 

• Cast from premium high-strength Class 32B iron
• Standard deck height allows the use of off the shelf parts
• Uses standard small block Camshaft, Timing Chain, Oil pump, Oil filter, Motor Mounts.
• Priority main oiling system directs oil to main bearings
• Blind tapped head bolt holes prevent water leaks
• Extra thick decks ensure reliable head gasket seal
• Billet steel 4-bolt main caps (splayed for extra strength)
• Front and rear external oil feed, crossover and restrictor provision
• Simplified plumbing for external pumps
• Used in 1500+HP Applications