← Previous Product Next Product →
Mast: LS7 265cc 4.000

Mast: LS7 265cc 4.000" Cylinder Heads [Camaro Corvette CTS V, LS7]

Vendor: Mast Motorsports

SKU:

$3,591.00 $3,780.00
Trying to improve on the best factory small-block cylinder heads ever built is no small endeavor. And yes, GM's 12-degree LS7 castings are the best small-block heads of all time-regardless...
Intake Valves
Exhaust Valves
WEAPON-X +10% Port

Trying to improve on the best factory small-block cylinder heads ever built is no small endeavor. And yes, GM's 12-degree LS7 castings are the best small-block heads of all time-regardless of engine make-trumping even the legendary Ford Cleveland heads. With a full CNC rubdown, monster 2.20/1.61-inch valves, and raised 270cc intake ports to go along with a flat 12-degree valve angle, factory LS7 heads flow 360 cfm out of the box. That's big-block territory, and at a hair less than $3,000 for a set of fully assembled LS7 heads from your friendly GMPP distributor, they're an exceptional value as well. So naturally, we were quite intrigued when Mast Motorsports announced it had just developed its own 265cc LS7 castings that outflows the factory design in a smaller bore.

LS7 performance for your LS3 LS2 or other 4.000" or larger bore LS engine!  Ideal on stroked engines, this LS7 265 head was designed from the ground up.

  • Utilizes the Gen IV LS valve-train and intake manifold
  • Designed for any new Gen IV short-block with 4.000" bore or larger
  • Uses a 2.165" intake valve and 1.600" exhaust valve
  • 11 Degree Valve angle
  • Has a 265cc intake port
  • Has a deck thickness of .750"

 

Flow Data w/4.065" Bore Plate
Lift Intake Exhaust
0.100 82 61
0.200 151 119
0.300 230 188
0.400 292 219
0.500 332 236
0.600 352 251
0.650 360 254
0.700 365 260
0.800 369 263
0.850 370  
0.900 371

Reviews

Related Products

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
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
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
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
ARP: Crankshaft Damper Bolt 234-2503 [LS LT]
ARP: Crankshaft Damper Bolt 234-2503 [LS LT] New Sale
$33.00 $35.00
As the crankshaft flexes and twists, the balancer absorbs incredible amounts of kinetic energy.  To ensure that the balancer is...
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 .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
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
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
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
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
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
Southways: 108mm Throttle Body [LS2 LS3 LS6 LS7 LS9 LSA LSX]
Southways: 108mm Throttle Body [LS2 LS3 LS6 LS7 LS9 LSA LSX]
New Sale
$1,349.99 $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
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
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
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
GM: Crankshaft Damper Bolt [LS2 LS3 LS6 LSA LSX]
GM: Crankshaft Damper Bolt [LS2 LS3 LS6 LSA LSX] New Sale
$4.00 $6.00
These are a high-quality harmonic balancer bolts from GM Performance Parts. These GM Performance Parts harmonic balancer bolts are made...
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
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
Mast: LS3 240cc 3.890" Cylinder Heads [Camaro Corvette CTS V, LS3 LSA]
Mast: LS3 240cc 3.890
New Sale
$3,116.00 $3,280.00
 A head that truly has no competition.  The Mast LS3 240 head was designed for customers with medium bore LS...
Select options
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
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 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: LS7 265cc 4.000" Cylinder Heads [Camaro Corvette CTS V, LS7]
Mast: LS7 265cc 4.000
New Sale
$3,591.00 $3,780.00
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 LSA 255cc 4.000" Cylinder Heads [Camaro Corvette CTS V, LS3 LSA]
Mast: LS3 LSA 255cc 4.000
New Sale
$3,581.00 $3,778.00
 A head that truly has no competition.  The Mast LSA 255cc head was designed for customers with medium bore LS...
Select options
Quick View
Lunati: Pro Series Billet Connecting Rods [Camaro Corvette CTS V, LS LT]
Lunati: Pro Series Billet Connecting Rods [Camaro Corvette CTS V, LS LT] New Sale
$1,349.00 $1,499.00
Lunati 6.125" Pro Billet Connecting Rods, .927" Wrist Pin, 2.1" Crank PinLunati's Pro Billet Connecting Rods offer the highest strength...
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
Callies: Ultra Billet Connecting Rods 6.125" [LS LSX LT Engines]
Callies: Ultra Billet Connecting Rods 6.125
New Sale
$1,699.00 $1,851.00
Callies Ultra connecting rods are produced from extremely clean Timken steel that is formulated to our exact specifications.  This proprietary steel is forged...
Quick View
BTR: LS Chromoly Pushrods 3/8" Diameter [Camaro, Corvette, CTS V, LS]
BTR: LS Chromoly Pushrods 3/8 New Sale
$105.00 $109.00
Chromoly One Piece Pushrods for LS - These one piece precision formed pushrods are constructed from SAE 4130 chromoly tubing,...
Select options
Quick View
Morel: 5428 .903" UltraPro LS Solid Roller Lifters [LS LT]
Morel: 5428 .903
New Sale
$899.00 $999.00
Morel Ultra Pro Link Bar Lightweight Solid Roller Lifters featuring cut away bodies for lighter weight. Features .903" diameter body,...
Quick View
BTR: LS Chromoly Pushrods 11/32" Diameter [Camaro, Corvette, CTS V, LS]
BTR: LS Chromoly Pushrods 11/32
New Sale
$105.00 $109.99
Chromoly One Piece Pushrods for LS - These one piece precision formed pushrods are constructed from SAE 4130 chromoly tubing,...
Select options
Quick View
FIC: 1700 CC - LS1, LS6, & Holley Hi Ram
FIC: 1700 CC - LS1, LS6, & Holley Hi Ram New
$135.00
1700 CC @ 3 BAR  All fuel compatible including Q16, methanol, and fuels with MTBE additive.  Direct fit for your...
Select options
Quick View
FIC: 1650 CC - LS
FIC: 1650 CC - LS New
$179.00
At 1650cc @4barThis Bosch EV14-based injector is the highest flowing high impedance performance injector compatible with all fuels, can be...
Select options
Quick View
FIC: 1700 CC - Truck Intake
FIC: 1700 CC - Truck Intake New
$135.00
1700 CC @ 3 BAR  All fuel compatible including Q16, methanol, and fuels with MTBE additive.  Direct fit for your...
Select options
Quick View

Scroll To Top