MTI Racing GM LT1/LT4 CNC Ported Cylinder Head
Price: $1,995.00 per pair
MTI Racing provides a CNC Ported version of the GM LT1 and LT4 Cylinder Head.
MTI Racing cylinder heads are precision CNC machined in house on our Haas and DMG Mori 5 Axis CNC machines to ensure that exact tolerances are maintained.
We have partnered with former NASCAR Specialist to optimize the available area of the stock casting out to 324cc’s ! Our LS and LT heads are cut in the exact same machine right here in Dawsonville, Ga. that has had Cup Series Racing heads developed in it.
Following each porting, each cylinder head receives a precision 5 angle valve job, not 3 angle used by many shops, to maximize flow and provide extended life of the cylinder head. To improve the performance of our valve job, MTI Racing also performs a contouring procedure on the exhaust valves seat using our Newen valve machine which blends the chamber into the narrow “throat” section of the port. Our development in this critical area is based off of countless hours of NASCAR cylinder head testing.
Note of Consequence: Don’t be fooled by competitors with flashy CFM numbers using larger valves, etc., that may be drastically larger than ours. Just like every chassis dyno will report your car at different power levels, so do cylinder head flow benches. Through our research, making a port bigger is NOT always better. Similar phenomenon occurs with CFM flow numbers. A particular head with slightly lower numbers may end up making MORE POWER due to the quality and direction of airflow. At the end of the day, MTI Racing is about making POWER, not selling CFM numbers.
Base price package includes porting your supplied cylinder heads. Upgraded valves and springs are additional cost.
This is a "core exchange" product. If you do not provide us with your cylinder heads to port before we send cylinder heads to you, we must charge you $3990.00 for you to purchase our product, and then when you provide us with your used cylinder heads, we will credit you back $1,995.00.
Price $ 1,995.00 per pair
Stainless 1 piece 2.02/1.57 valves additional $275.00
MTI Racing LSx Dual Valve Spring Titanium Retainer & Seals Kit additional $345.00
LT1 and LT4
Intake Runner Volume 299cc stock 324 MTI Ported
Exhaust Runner Volume 108cc stock 117 MTI Ported
Intake Valve Diameter 2.125 stock 2.165 MTI
Exhaust Valve Diameter 1.590 LS6 OEM
Valve Stem Diameter 8mm
Flow Characteristics CFM
Valve Lift Stock MTI CNC Stock MTI CNC
.1 63 72 55 57
.2 130 132 113 105
.3 203 200 149 143
.4 269 266 167 177
.5 309 309 194 205
.6 313 341 199 221
.7 318 .75 367 205 228
.75 205 231
LT4 Ported and hand polished. New aftermarket, very nice, valves.
Note: Tested with 4.125 bore, clay entry on intake port.
No pipe on exhaust port.
Untouched combustion chamber.