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Mast Motorsports

Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451

PART NUMBER:
CH-LSX-302451
MPN:
CH-LSX-302451
Availability:
Ships from Manufacturer
Shipping:
Free Over $98 In U.S. 48
Type:
LS3 Cylinder Heads
Material:
A356-T6 Aluminum
CNC Machined Intake Runner:
No
CNC Machined Exhaust Runner:
No
CNC Machined Combustion Chamber:
No
Minimum Bore Size (in.):
4.000
Bolts Per Cylinder:
6
Assembled:
No
Valve Angle (°):
11
Intake Runner Volume (cc):
255
Exhaust Runner Volume (cc):
106
Chamber Volume (cc):
70
Intake Valve (in.):
2.165
Intake Material:
Stainless Steel
Exhaust Valve (in.):
1.600
Exhaust Material:
Stainless Steel
Valve Guides Included:
Yes
Valve Guides Material:
Bronze
Intake Seat Material:
High Chrome Alloy Steel
Exhaust Seat Material:
High Chrome Alloy Steel
Valve Job Type:
As Cast
Rocker Stands Included:
Yes
Rocker Stand Material:
Mast Billet
Valve Springs Included:
No
Valve Spring Type:
N/A
Valve Spring Max Lift (in.):
N/A
Closed Spring Pressure:
N/A
Open Spring Pressure:
N/A
Retainers Included:
No
Spring Retainer Material:
N/A
Quantity:
Sold as a Pair
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
  • Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451
$2,300.00

Description

Mast GM LS3 255cc/70cc 11° Cylinder Heads Factory Cast - Pair w/ Valves CH-LSX-302451

Introducing the Factory Mast "As Cast" Port Cylinder Head.                                           
Mast launched the Factory Mast product line to deliver an economical product line for our customers. 
Mast completely engineered and manufactured their long standing best in class CNC port into an "As Cast" port.  This new process saves a significant amount of time and manufacturing cost, which is savings we pass down to you.
You have come to love the "Black Label" Cylinder heads, but now you can get the same quality at a lower price without SACRIFICING performance.
Manufactured using permanent mold technology, this casting is simply an amazing surface finish and quality.  
Mast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. 

Dimensional Specs

  • Bore Size: 4.000 (+)
  • Weight: 28.5 lbs.
  • Intake Valve Size: 2.165"
  • Exhaust Valve Size: 1.600"
  • Valve Stem Diameter: 5/16"
  • Valve Length: 5.450"
  • Valve Angle: 11°
  • Valve Spring Pocket Diameter: 1.580"
  • Valve Spring Install Height: 1.800"
  • Head Stud Size: .4375"
  • Valve Guide OD: .502"
  • Valve Job Type: As Cast

Air Flow & Performance Criteria

  • Intake Max. Flow: 358 CFM @ 7.000"
  • Exhaust Max. Flow: 230 CFM @ 7.000:
  • Intake Average Flow: 236 CFM
  • Exhaust Average Flow:160 CFM
  • Intake Seat Material: High Chrome Alloy Steel
  • Intake Port Volume: 255cc
  • Exhaust Port Volume: 106cc
  • Standard Chamber Volume:70cc
  • Port Type:As Cast

Materials

  • Cylinder Head Material: A356-T6 Aluminum
  • Intake Valve Seat Material: High Chrome Alloy Steel
  • Exhaust Valve Seat Material: High Chrome Alloy Steel
  • Deck Thickness: .750"
  • Rocker Stand Type: Mast Billet
  • Rocker Arm Type: OE LS7 1.8 or Aftermarket
  • Guide Material: Bronze

General

  • Rocker Stand Type: Mast Billet
  • Rocker Stands Included: Yes
  • Rocker Stand Dowels Included: Yes
  • Uses Stock Rocker Bolts: No
  • Rocker Bolts Included: No
  • Rocker Arm Type: OE LS3 1.7 or Aftermarket
  • Head Bolt QTY: 6 Bolt Style
  • Valve Cover Rail Height: + ½ inch
  • Can use OE Valve Cover: Yes

Custom Options Available

  • Chamber Softening
  • Custom Chamber Sizing
  • ½ inch head stud clearance
  • Copper Exhaust & Intake Valve Seats

 

 

 

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