Mast: LS3 280cc 4.125 Cylinder Heads [Camaro Corvette CTS V, LS3 LSA]

Mast: LS3 280cc 4.125 Cylinder Heads [Camaro Corvette CTS V, LS3 LSA]

Vendor: Mast Motorsports

SKU:

$3,876.00 $4,080.00
 A head that truly has no competition.  The Mast LS3 280 head was designed for customers with big bore LS engines that wanted to run LS3 intakes or superchargers.  This...
Intake Valves
Exhaust Valves
WEAPON-X +10% Port

 A head that truly has no competition.  The Mast LS3 280 head was designed for customers with big bore LS engines that wanted to run LS3 intakes or superchargers.  This head is very capable when paired with the proper intake and displacement and has supported over 900hp on pump gas with a Whipple 2.9L consistently.

Heads come standard with PAC 1207X Double Springs for boosted applications; however, if you want the N/A PAC 1204X Beehive Springs, specify in the order notes.  Listing also includes the GM rocker arm mounts.
  • Utilizes the Gen IV LS7 OEM rockers, but accepts the LS3/L76 intake manifold
  • Designed for any new Gen IV short-block with 4.125" bore or larger
  • The 6-bolt design is compatible with GM LSX and RHS Blocks
  • Uses a 2.200" intake valve and 1.600" exhaust valve
  • 12 Degree Valve angle
  • Has a 280cc intake port
  • Has a deck thickness of .750"
  • 70cc Combustion Chamber Standard
  • Cast & Machined in the USA!

Flow Data w/4.125" Bore Plate
Lift Intake Exhaust
0.100 78 65
0.200 162 118
0.300 243 171
0.400 304 212
0.500 347 229
0.550 362  
0.600 376 245
0.650 384 247
0.700 390 249

Reviews

Related Products

DSX: Flex Fuel Sensor Kit [Camaro Corvette CTS V G8 GTO SS]
DSX: Flex Fuel Sensor Kit [Camaro Corvette CTS V G8 GTO SS]
New Sale
$299.00 $349.00
The DSX Tuning flex fuel kit is the original plug and play solution to adding flex fuel on Gen IV/Gen V...
Select options
Quick View
SMC: Catch Cans [LS LT]
SMC: Catch Cans [LS LT] New Sale
$119.00 $139.00
Saikou Michi Co. is here to make the finest oil catch tanks you can find anywhere. These are not blingy...
Select options
Quick View
PS: Magnetic Oil Pan Drain Plug [Camaro Corvette CTS V SS G8 GTO]
PS: Magnetic Oil Pan Drain Plug [Camaro Corvette CTS V SS G8 GTO] New Sale
$20.00 $25.00
Want to further protect your LS or LT engine, then consider this mangentic drain plug.  Select your vehicle below! Plug...
Select options
Quick View
NW: 102mm Throttle Body - Boosted (3rd Party) [LS3 LS7 LS9 LSA]
NW: 102mm Throttle Body - Boosted (3rd Party) [LS3 LS7 LS9 LSA] New Sale
$699.00 $749.00
Nick Williams 102mm LS3/L92/LS7/LSXR (Electronic) Throttle Body, Will work on modified LS1/LS2/LS6 engines also. This throttle body accepts the LS2/LS3...
Select options
Quick View
WEAPON-X: LS3 (LS7) 90mm Ported Throttle Body [Camaro Corvette CTS V]
WEAPON-X: LS3 (LS7) 90mm Ported Throttle Body [Camaro Corvette CTS V]
New Sale
$174.00 $199.00
The WEAPON-X ported throttle bodies are quickly becoming notorious for quality, improved driveability, and power!  These are the newer brass...
Select options
Quick View
Elite Engineering: E2-X Catch Can Kit [Camaro Corvette CTS V, LS LT]
Elite Engineering: E2-X Catch Can Kit [Camaro Corvette CTS V, LS LT]
New
$300.00
The E2-XTM Dual outlet system: All the features of the E2-X single outlet and more! A must for the aggressively driven...
Select options
Quick View
WEAPON-X: 102mm Throttle Body Spacer 4 bolt flange [LSA LS1 LS2 LS3 LS6 LS7 LS9]
WEAPON-X: 102mm Throttle Body Spacer 4 bolt flange [LSA LS1 LS2 LS3 LS6 LS7 LS9] New Sale
$69.00 $79.00
When running the stock upper pulley, the housing on the 102mm throttle bodies get in the way.  This spacer will...
Quick View
Injector Dynamics: ID1050x Injectors [LS3 LS7 LSA LS9 L76 L92 L99]
Injector Dynamics: ID1050x Injectors [LS3 LS7 LSA LS9 L76 L92 L99] New
$1,024.00
Upgrading injectors?  Any injector can "flow" at wide open throttle, the difference is in low end driveability; don't settle!  These...
Quick View
ARP: Cam Bolts for 3 Bolt Cam 134-1003 [LS LT]
ARP: Cam Bolts for 3 Bolt Cam 134-1003 [LS LT] New Sale
$7.00 $8.00
End your camshaft timing worries! High-quality ARP cam bolts have increased preload clamping force to ensure positive timing gear register....
Quick View
GM: LS Cam Gear - 3 Bolt, 4 Pole
GM: LS Cam Gear - 3 Bolt, 4 Pole New Sale
$20.00 $25.00
This GM 3 Bolt 4 Pole timing chain gear is used when converting from a 1 bolt camshaft to 3...
Quick View
BTR: LS .660 Double Spring Kit
BTR: LS .660 Double Spring Kit
New Sale
$229.00 $309.99
Details THESE ARE FOR STOCK ROCKERS .660" Lift Platinum Spring Kit   SP001/SK001 springs are designed for use with stock rockers....
Select options
Quick View
NW: 102mm Throttle Body [Camaro Corvette CTS V, LS3 LS7 LS9 LSA]
NW: 102mm Throttle Body [Camaro Corvette CTS V, LS3 LS7 LS9 LSA] New
$629.95
Nick Williams 102mm LS3/L92/LS7/LSXR (Electronic) Throttle Body, Will work on modified LS1/LS2/LS6 engines also. This throttle body accepts the LS2/LS3...
Select options
Quick View
GM: PCM [Camaro Corvette CTS V ATS V SS G8 GTO]
GM: PCM [Camaro Corvette CTS V ATS V SS G8 GTO] New Sale
$389.00 $449.00
Looking for a tune but for various reasons you don't want to overwrite your stock PCM?  Buy a spare unit,...
Select options
Quick View
BTR: LS Front Timing Cover Gasket [LS2 LS3 LS6 LS7 LS9 LSA]
BTR: LS Front Timing Cover Gasket [LS2 LS3 LS6 LS7 LS9 LSA] New Sale
$16.00 $20.00
Front Timing Cover Gasket for LS engines, like 12633904
Quick View
GM: Water Pump Gasket for LS
GM: Water Pump Gasket for LS New Sale
$5.00 $6.00
Water pump gasket for LS engines.
Quick View
Morel: 5290 LS Link Bar Hydraulic Roller Lifters [LS LT]
Morel: 5290 LS Link Bar Hydraulic Roller Lifters [LS LT]
New Sale
$349.00 $379.00
Morel Link Bar Hydraulic Roller Lifters with stock .700" diameter wheels .842 body.  Link bars ensure that you'll never have...
Quick View
Comp Cams: Rocker Arm Trunion Kit [LS1 LS2 LS3 LS7 LS6 LS9 LSA LT1 LT4]
Comp Cams: Rocker Arm Trunion Kit [LS1 LS2 LS3 LS7 LS6 LS9 LSA LT1 LT4]
New Sale
$140.00 $150.00
Stock Rocker Arm trunion kit for all LT and LS rocker arms.
Quick View
GM: Timing Chain Damper Seal
GM: Timing Chain Damper Seal New
$20.00
Timing Chain Damper Seal for LS engines.
Quick View
GM: Timing Chain Dampener [LS2 LS3 LS7 LS9 LSA]
GM: Timing Chain Dampener [LS2 LS3 LS7 LS9 LSA] New Sale
$18.00 $22.00
Production LS2 and newer Timing Chain Dampener, helps dampen chain whip and extend chain life. Will not fit LS1 and...
Quick View
Intake Elbow for 90 to 102 TB [LS LSX]
Intake Elbow for 90 to 102 TB [LS LSX]
New
$349.00
GM LSX, F-BODY, CORVETTE INTAKE ELBOW -4.2" high for use with Edelbrock  Victor Junior or GMPP intake -Available for stock...
Quick View
Elite Engineering: Standard Catch Can
Elite Engineering: Standard Catch Can
New Sale
$155.00 $160.00
The PCV (Positive Crankcase Ventilation) system is designed to remove fumes from the engine crankcase, and alleviate crankcase pressure which...
Select options
Quick View
WEAPON-X: LS Billet Valve Covers [Camaro Corvette CTS V G8 SS]
WEAPON-X: LS Billet Valve Covers [Camaro Corvette CTS V G8 SS]
New Sale
$799.00 $899.00
Valve Covers are one of the most overlooked upgrades on the modern LS engine and this solution will add both...
Select options
Quick View
Southways: 108mm Throttle Body [LS2 LS3 LS6 LS7 LS9 LSA LSX]
Southways: 108mm Throttle Body [LS2 LS3 LS6 LS7 LS9 LSA LSX]
New Sale
$1,499.99 $1,599.00
Southways has built the first functioning LS3 style 108mm throttle body. It uses all the factory LS3 electronics and motor...
Select options
Quick View
Elite Engineering: E2 Single Catch Can [Camaro Corvette CTS V G8, LS LT]
Elite Engineering: E2 Single Catch Can [Camaro Corvette CTS V G8, LS LT]
New Sale
$180.00 $185.00
The PCV (Positive Crankcase Ventilation) system is designed to remove fumes from the engine crankcase, and alleviate crankcase pressure which...
Select options
Quick View
ARP: Pro Series Head Stud Kit [LS2 LS3 LS6 LS7 L92]
ARP: Pro Series Head Stud Kit [LS2 LS3 LS6 LS7 L92] New Sale
$299.00 $325.00
ARP Pro Series cylinder head studs are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and...
Quick View
Katech: C5R Billet Timing Chain [LS LT Camaro Corvette CTS V G8 SS]
Katech: C5R Billet Timing Chain [LS LT Camaro Corvette CTS V G8 SS] New Sale
$149.99 $174.00
Induction hardened and precision machined steel billet gears for bullet proof durability. Feature 9 keyway crank sprocket for 2-degree incremental...
Select options
Quick View
BTR: Rocker Arm Trunion Kit [LS1 LS2 LS3 LS7 LS6 LS9 LSA LT1 LT4]
BTR: Rocker Arm Trunion Kit [LS1 LS2 LS3 LS7 LS6 LS9 LSA LT1 LT4]
New Sale
$115.00 $125.00
Stock Rocker Arm trunion kit for all LT and LS rocker arms.
Select options
Quick View
WEAPON-X: LS2 (LS7) 90mm Ported Throttle Body [Camaro Corvette CTS V]
WEAPON-X: LS2 (LS7) 90mm Ported Throttle Body [Camaro Corvette CTS V] New
$499.00
The WEAPON-X ported throttle bodies are quickly becoming notorious for quality, improved driveability, and power! These are the silver blade...
Select options
Quick View
Mighty Mouse: Oil Fill -AN Adapters
Mighty Mouse: Oil Fill -AN Adapters
New Sale
$30.00 $35.00
These Direct mount on LS and other valve covers that fit an LS type oil cap to provide a new...
Select options
Quick View
GMPP: Racing Lifters [LS2 LS3 LS6 LS7 LS9 LSA LT1 LT4 LT5]
GMPP: Racing Lifters [LS2 LS3 LS6 LS7 LS9 LSA LT1 LT4 LT5] New Sale
$189.00 $199.00
GM Performance hydraulic roller lifter set for high performance applications. This new hydraulic roller lifter was developed by GM Racing...
Quick View
Comp Cams: Billet Timing Chain and Cam Sprocket [LS1 LS2 LS3 LS6 LS7 LS9]
Comp Cams: Billet Timing Chain and Cam Sprocket [LS1 LS2 LS3 LS6 LS7 LS9] New
$175.00
LS engines - billet timing gear set with single row timing chain and 3 bolt cam gear. All timing chain...
Select options
Quick View
TPIS: 102mm Throttle Body [Camaro Corvette CTS V LS2 LS3 LSA LS7 LS9]
TPIS: 102mm Throttle Body [Camaro Corvette CTS V LS2 LS3 LSA LS7 LS9]
New Sale
$1,099.00 $1,299.00
TPiS has built the first functioning LS2 style 102mm throttle body. This throttle body takes care of the issues many...
Quick View
IWIS: Single Roller Timing Chain [LS2 LS3 LS6 LS7 LS9 LSA LT1 LT4 LT5]
IWIS: Single Roller Timing Chain [LS2 LS3 LS6 LS7 LS9 LSA LT1 LT4 LT5] New
$99.00
The timing chain is the finest chain on the market. This single roller chain will work with factory and aftermarket...
Quick View
Trick Flow: 255cc 4.060" LS3 Cylinder Heads [Camaro SS ZL1 CTS V G8]
Trick Flow: 255cc 4.060
New
$2,599.00
Looking to increase the airflow into the cylinders and reduced the heat and boost pressure on your CTS V or...
Select options
Quick View
RX: Monster Catch Can
RX: Monster Catch Can New
$359.00
The RX "MONSTER" oil catch can is for the huge boost built applications and works unreal well at providing proper...
Select options
Quick View
Injector Dynamics: ID1300 Injectors [LS3 LS7 LSA LS9 L76 L92 L99]
Injector Dynamics: ID1300 Injectors [LS3 LS7 LSA LS9 L76 L92 L99] New
$1,799.00
Upgrading injectors?  Any injector can "flow" at wide open throttle, the difference is in low end driveability; don't settle! The...
Quick View
Callies: Compstar Connecting Rods
Callies: Compstar Connecting Rods New Sale
$625.00 $699.00
Better by Design Designed and produced with engineering and finishing advancements, CompStar high performance connecting rods have what it takes...
Quick View
Hinson: C7R Billet Timing Chain [LS LT Camaro Corvette CTS V G8 SS]
Hinson: C7R Billet Timing Chain [LS LT Camaro Corvette CTS V G8 SS] New Sale
$149.99 $174.00
Induction hardened and precision machined steel billet gears for bullet proof durability. Feature 9 keyway crank sprocket for 2-degree incremental...
Quick View
Katech: Piston Oil Squirters [LS LT Camaro Corvette G8 SS]
Katech: Piston Oil Squirters [LS LT Camaro Corvette G8 SS]
New
$899.00
When stroking a stock motor or sleeving a motor with oil squirters, they have to be removed. Katech has the...
Quick View
Injector Dynamics: ID1700X Injectors [LS3 LS7 LSA LS9 L76 L92 L99]
Injector Dynamics: ID1700X Injectors [LS3 LS7 LSA LS9 L76 L92 L99] New
$1,984.00
Upgrading injectors?  Any injector can "flow" at wide open throttle, the difference is in low end driveability; don't settle! The...
Quick View
Comp Cams: Lifters [Camaro Corvette CTS V, LS LT]
Comp Cams: Lifters [Camaro Corvette CTS V, LS LT] New Sale
$195.00 $225.00
Getting rid of the factory AFM for a more aggressive cam and performance? Take a look what the pros at...
Quick View
BTR: LS Chromoly Pushrods 5/16" Diameter [Camaro, Corvette, CTS V, LS]
BTR: LS Chromoly Pushrods 5/16 New Sale
$92.00 $99.99
Chromoly One Piece Pushrods for LS - These one piece precision formed pushrods are constructed from SAE 4130 chromoly tubing,...
Select options
Quick View
GM: LT5 6.2L Supercharged Crate Engine [Camaro, Corvette, CTS V]
GM: LT5 6.2L Supercharged Crate Engine [Camaro, Corvette, CTS V]
New Sale
$17,499.00 $17,915.00
As heart of the Corvette ZR1, the supercharged LT5 6.2L SC is the most powerful engine ever offered in a...
Quick View
RX: Clean Air Oil Separator
RX: Clean Air Oil Separator New Sale
$99.00 $149.00
Designed for the LS and LT dry sumps. This newly re-designed unit now features a threaded billet capwhich disassembles for...
Select options
Quick View
RHS: GM LS Race Blocks
RHS: GM LS Race Blocks
New
$4,999.00
Select your bore, deck height, and rough or finish hone!  If it says unavailable, they don't offer it.RHS® – Delivering...
Select options
Quick View
Mast: LS7 EFI Single Plane Intake Manifold [Camaro Corvette CTS V]
Mast: LS7 EFI Single Plane Intake Manifold [Camaro Corvette CTS V]
New Sale
$1,661.00 $1,749.00
4150 or 4500 EFI Single Plane Option CAD designed and Super Flow flow bench tested Fully CNC machined, fully ported...
Select options
Quick View
Mast: LS7 305cc 4.125" Cylinder Heads [Camaro Corvette CTS V, LS7]
Mast: LS7 305cc 4.125
New Sale
$3,951.79 $4,159.78
Trying to improve on the best factory small-block cylinder heads ever built is no small endeavor. And yes, GM's 12-degree...
Select options
Quick View
Mast: LS7 285cc 4.125" Cylinder Heads [Camaro Corvette CTS V, LS7]
Mast: LS7 285cc 4.125
New Sale
$3,876.00 $4,080.00
Trying to improve on the best factory small-block cylinder heads ever built is no small endeavor. And yes, GM's 12-degree...
Select options
Quick View
Mast: LS3 280cc 4.125 Cylinder Heads [Camaro Corvette CTS V, LS3 LSA]
Mast: LS3 280cc 4.125 Cylinder Heads [Camaro Corvette CTS V, LS3 LSA]
New Sale
$3,876.00 $4,080.00
 A head that truly has no competition.  The Mast LS3 280 head was designed for customers with big bore LS...
Select options
Quick View
Intake Elbow Low Profile for 90 to 102 TB
Intake Elbow Low Profile for 90 to 102 TB
New
$299.00
Intake elbow for 4150 or 4500 Dominator -4.875" for low hood/cowl clearance setups -Available in 90/100/110 degree configurations -Available in...
Quick View

Scroll To Top