Mangum Racing
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Offering a full line of CNC-ported cylinder heads, including aftermarket and OEM stock castings.
09/23/2026
Time to put this run together!
09/11/2026
Our good friend installs our new 235 cathedral on another close friend’s car!
Just in case you wanted to see down the runner of our 267 ls3….
Laser engraving the new MR 229 Cathedral for SW!
All new big runner 15 degree cathedral heads in production!!! Perfect for the 3.898-4.030” bore guys!!
08/19/2026
LOok out for this BEAST!
11 degree LS3….
08/11/2026
Have a friend swapping heads/cam on their 4.8L/5.3L LS based engine? The all new MR 229 cathedral head clears 4.8L/5.3L bores and offers a ground up new port/chamber design for big power gains!!
229cc LS Cathdral CNC Ported Cylinder Heads | Mangum Racing CNC ported 229cc LS cathedral port cylinder heads on Mangum Racing castings. Big airflow and power for LS builds, with custom valve spring options. Clears 4.8l/5.3l bore size!
07/27/2026
We are proud to announce the all new MR-229 cathedral port heads are now available in 4 & 6 bolt configuration!! The best part is these cylinder heads flow killer air and support a 4.8l/5.3l bore or larger!!
229cc LS Cathdral CNC Ported Cylinder Heads | Mangum Racing CNC ported 229cc LS cathedral port cylinder heads on Mangum Racing castings. Big airflow and power for LS builds, with custom valve spring options. Clears 4.8l/5.3l bore size!
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113 Cantera Way
Georgetown, TX
78628