MTI Racing GM LT1/LT4 CNC Ported Cylinder Head

MTI Racing GM LT1/LT4 CNC Ported Cylinder Head

Price: $1,495.00 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.

Customer must supply the undamaged heads to be ported. 

Price $ 1,495.00 per pair

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

                                       Intake                                           Exhaust

 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.

 Milled .050”

Note: Tested with 4.125 bore, clay entry on intake port.

No pipe on exhaust port.

Untouched combustion chamber.