LS OutLaw Block specs and features include:
• CNC-machined cast-iron block
• True priority main oiling
• 6-head bolts per cylinder
• Standard 4.400" bore spacing
• Extra-thick siamese cylinder bores
• Semi-finished, machined thicker decks
• LS7-style, 6-bolt dowel-located billet main bearing caps
• Wet-sump and dry-sump oiling capability
• Production-style deep-skirt head bolt holes
• Production bolt hole and thread sizes
• Maintains production exterior accessory mounting provisions
• Front motor plate mounting holes added
• Additional material cast around cam bearings for greater strength

• 8mm exterior/interior fifth- and sixth-head bolt holes
• Standard 0.842" lifter bores
• Accommodates all LS oil pumps and oil pans
• External oil pump feed (rear of block)
• Main web bay-to-bay breathing holes to support greater horsepower
• Camshaft Journal is 58.605mm (2.3073”) ID bore use GM (P/N 19167218)

LS OutLaw Block – Standard Deck
• 3.880" cylinder bores
• 9.260" semi-finished standard deck height (ready to be decked)
• 4.250" maximum stroke (professional engine builders only!)
• Capable of 364- to 482-cubic-inch displacements
• Powder-coated finish
• Accepts all LS and LSX Series heads, cranks, cams, etc.
• Approximate finished weight is 225 pounds

Superior gray iron alloy

4.00” unfinished or 4.125” finished
4.185” x 3.875” max recommended
SBC - 2.00”
Not Included
+ .010”, +.020”, +.030”
Standard SBC - 1.869”
2.375” dia. Screw in Plug
.275” min @ 4.185” bore
.675” min.
Mechanical pump provision
Standard Length
Screw in freeze plugs
SBC .8427” - .8437”
(350) 2.6401” / -.001”
#1 7/16” (2) 3/8” (2)
#2, #3, #4 7/16” (2) 7/16” splayed (2)
#5 7/16” (2) 3/8” (2)
Billet Steel - 4 bolt, all 5
Deep stepped register on each side (no need for dowels)
Wet Sump - Main Priority Oiling (can use dry sump)
350 main = Stock shaft (.481”OD)
Standard SBC filter, uses 2 bolt filter adapter
Standard SBC oil pan
350 main - std 2-pc seal 
Standard SBC
Blind holes
Standard SBC components
Can use stock cover / Magnesium w/ pump provision avail.
1-5 7/16” bolts - 65 ft lbs
1 & 5 3/8” bolts - 35 ft lbs
approx 205 lbs @ 4.00” bore

SBC 350 Xtreme Block Spec Sheet

Delivering the seemingly impossible combination of professional racing-level strength and entry-level affordability, the LS OutLaw Block is the next revolution in high-performance engine-building. This durable iron-block casting is based primarily on the production LS7 block, but designed with more material in key areas – including thicker deck and bores – to support displacements of 454 cubic inches or more, and unique six-bolts-per-cylinder-headclamping capability that enables forced-induction and nitrous combinations of greater than 2,000 horsepower.

​Because the LS OutLaw block is based on production LS blocks, all of the LSSeries Gen IV cylinder heads, crankshafts, oil pans, camshafts, and accessories bolt right up to it. Adept Performance Products delivers the LS OutLaw Block semifinished, allowing you to finish it to your needs. Whether you’re building a “tame” 500-horse street engine for your hot rod or a 1,700 horsepower turbo engine for an Outlaw drag racer, the OutLaw Block is the foundation for an unbeatable combination – at an unbeatable price!

SBC 350 Xtreme Bare Block  (finished or semi finished)



Bore & stroke:
Cam bearing bore ID: 
Cam bearings: 
Cam Bearing O.S. :
Cam bearing press:
Cam journal OD: 
Cam Plug: 
Cylinder Wall Thickness: 
Deck Height:
Deck Thickness: 
Fuel Pump: 
Fuel Pump Pushrod: 
Freeze Plugs: 
Lifter Bores: 
Main bearing size: 
Main bearing bore: 
Main Cap Bolts: 

Main cap press:
Main caps: 
Main cap register: 
Oil system: 
Oil Pump shaft: 
Oil Filter: 
Oil Pan: 
Rear Main Seal:
Stud holes, Head: 
Timing chain/gears:
Timing Cover:
Torque Specs:

Net Weight: