#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
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#SpeedSecrets Factory rectangular port heads outflow factory cathedr…
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58K views · 566 reactions | #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 | Facebook
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58K views · 566 reactions | #SpeedSecrets We tested a set of …
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