Mangum Racing

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!

07/14/2026

We have several different styles of aftermarket Ls3 heads on the shelf and we would LOVE to see them on your next build! Reach out to me for free chamber softener and half inch head stud up grade this week only! Ending July 19th 2026.

07/12/2026

https://mangumracing.com/

We have officially launched our website! Drop in and take a look around! Keep an eye out for sales and new products!!!

Thanks,
Mangum Racing

Mangum Racing CNC Ported Cylinder Heads