Mangum Racing

09/09/2026

Just in case you wanted to see down the runner of our 267 ls3….

09/04/2026

Laser engraving the new MR 229 Cathedral for SW!

08/27/2026

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!!

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!

07/30/2026

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!!

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!