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Introducing the Factory Mast "As Cast" Port Cylinder Head.
We launched our Factory Mast product line to deliver an economical product line for our customers.
We completely engineered and manufactured our 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.
Full Send, no compromises, no shortcuts, ever.
Dimensional Specs
Bore Size:4.125 (+)
Weight: 28 lbs.
Intake Valve Size:2.250"
Exhaust Valve Size:1.600"
Valve Stem Diameter:5/16"
Valve Length:5.450"
Valve Angle:12°
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: 372 CFM @ 1.000"
Exhaust Max. Flow: 191 CFM @ 1.000"
Intake Average Flow: 287 CFM
Exhaust Average Flow:164 CFM
Intake Seat Material: High Chrome Alloy Steel
Intake Port Volume: 294cc
Exhaust Port Volume:104cc
Standard Chamber Volume:71cc
Port Type:As Cast
Materials
Cylinder Head Material: A356-T6 Aluminum
Intake Valve Seat Material: High Chrome Alloy Steel