#SpeedSecrets We tested a set of cathedral port LS heads against rectangular port heads in a dyno shootout. Which one wins? See the results in our Summit Racing Speed Secrets video: | Summit Racing Equipment

12K views · 94 reactions | Boosted Head Test Rec Port vs Cathedral Port 317 vs LS3 (NA and under boost) Single Turbo LS3 | Richard Holdener | Facebook

23K views · 270 reactions | Square Port vs Cathedral Port Heads  Which one delivers more power? Which one brings the torque? We put them to the test — watch the full video to find out!  | GM Motorsport | Facebook

1.4K views · 18 reactions | Holley offers a split plenum manifold for...

9.9K views · 210 reactions | #SpeedSecrets Factory rectangular port heads outflow factory cathedral port heads on a 6.0L LS. But how much power can you expect to gain from a set of PORTED cathedral port heads? Will they outperform the rectangular port heads? And just how important is intake manifold choice with a top-end upgrade? Watch the test and get answers: | Summit Racing Equipment | Facebook

4.3K views · 110 reactions | We obsess over cylinder heads. See why all the world’s fastest racers choose 4P Cylinder Heads #KILL #4P #4piston #4pistonracing | 4 Piston Cylinder Heads | Facebook

10K views · 193 reactions | The 1938 MAN engine. Tightening the cylinder heads down evenly! Ken and I had a bit of a work out today fortunately George who's doing some hands engineering prior to college was cajoled into helping when the higher torque was required! | Anson Engine Museum | Facebook