MTI Racing GM Ported Rectangular Cylinder Heads
Price : $1,495.00 per pair
MTI Racing provides a CNC Ported version of the Rectangular LS3 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 275cc’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.
Price $ 1,495.00 per pair
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 $2990.00 for you to purchase our product, and then when you provide us with your used cylinder heads, we will credit you back $1,495.00.
Stainless 1 piece 2.02/1.57 valves additional $275.00
MTI Racing LSx Dual Valve Spring Titanium Retainer & Seals Kit additional $345.00
Intake Runner Volume 256 stock 275 ported
Exhaust Runner Volume 85 stock 91 ported
Intake Valve Diameter 2.165 OEM
Exhaust Valve Diameter 1.590 OEM
Valve Stem Diameter 8mm
Valve Angle 45 degrees
Valve Lift Stock MTI CNC Stock MTI CNC
.1 71 73 50 52
.2 182 150 105 108
.3 212 227 147 148
.4 262 278 177 191
.5 298 314 196 223
.6 307 332 204 231
.7 296 332 208 235
Note: Tested with 4.125 bore, clay entry on intake port. No pipe on exhaust port.
Untouched combustion chamber.