Make Your LS/LT or Godzilla Motor Fly: Summit Racing Components

Go Go Godzilla

Mast Motorsports has been a benchmark for GM LS and LT engine performance for many years. It’s also quickly becoming the source for go-fast parts for the Ford 7.3L Godzilla. Let’s take a look at some parts.

Black Label Aluminum Cylinder Heads for LS and LT Engines

Mast Motorsports Black Label cylinder heads are designed, cast, and CNC-machined in the USA. They feature CNC-machined runners and combustion chambers, .750 inch thick decks and a six-bolt-per-cylinder mounting pattern to reduce the possibility of blown head gaskets due to large amounts of boost or nitrous oxide. 

Most Mast Motorsports Black Label cylinder heads are available bare so you can build them to your specifications. Assembled heads come with valves, valve springs, locks, and retainers.

LS Cathedral Port
• 245cc intake runners, 70cc chambers with 2.165/1.600 inch valves
• 252cc intake runners, 62cc chambers with 2.040/1.570 inch valves
• 295cc intake runners, 70cc chambers with 2.250/1.600 inch valves
• 305cc intake runners, 70cc chambers with 2.250/1.600 inch valves

LS3 Rectangular Port
• 240cc intake runners, 61cc chambers with 2.080/1.570 inch valves
• 255cc intake runners, 70cc chambers with 2.165/1.600 inch valves
• 290cc intake runners, 70cc chambers with 2.250/1.600 inch valves
• 295cc intake runners, 70cc chambers with 2.250/1.600 inch valves

LS7 Rectangular Port
• 265cc intake runners, 70cc chambers with 2.165/1.600 inch valves
• 305cc intake runners, 70cc chambers with 2.250/1.600 inch valves

LT1
• 292cc intake runners, 60cc chambers with 2.165/1.600 inch valves
• 313cc intake runners, 70cc chambers with 2.250/1.600 inch valves

Cylinder Heads, Camshafts, and Valve Spring Kit for Ford 7.3L Godzilla

The Street Performance Cylinder Heads are factory Ford castings that get a Mast Motorsports CNC porting job. The treatment is worth an extra 39cc of intake airflow at .600 inch of valve lift. At .800 inch of lift, airflow jumps by 60 cfm. That’s a lot of air whooshing through those runners.

Godzilla Hydraulic Roller Camshafts are offered in four versions. They come with an adjustable timing gear that eliminates the factory variable cam timing. This allows you to advance or retard cam timing by up to 10 degrees. The Godzilla camshafts use the factory chain and crankshaft gear and the factory cam sensor trigger wheel.

Cam Specifications
• RV: 220°/236° duration @.050 inch lift, .630″/.659″ lift, 120° lobe separation
• Off-Road: 232°/246° duration @.050 inch lift, .630″/.659″ lift, 112° lobe separation
• Street: 242°/256° duration @.050 inch lift, .670″/.659″ lift, 114° lobe separation
• Street/Race: 250°/254° duration @.050 inch lift, .670″/.659″ lift, 117° lobe separation

The Godzilla Valve Spring Kit is a drop-in replacement for the factory valve springs. It comes with dual beehive valve springs rated to .650″ of valve lift, lightweight titanium retainers, hardened spring seats, and valve seals. The kit reuses the locks from the factory valve springs.

Summit Racing carries plenty of other Mast Motorsports parts including intake manifolds, camshafts and engine swap oil pans for LS engines, and valve covers for LS, LT, and Godzilla engines.