Web15 Jan 2024 · The square port plates were maybe 1/8" thick, but had bigger shoulders to cover up the dogleg kickout and kept the headers/manifolds from leaking. ... Dog leg headers on square port heads shouldn’t be an issue flow wise, doing it the other way around would be more of an issue. Gasket seal can be a bit of a challenge as the amount of sealing ... Web20 Feb 2024 · Square port manifolds are ok on round port heads, but round port manifolds are no good for square port heads. 280z and 280zx bodies are different, so you also want …
Big-Block Heads Shootout - The Big O Vs. The Big R
WebGenerally speaking, cathedral port heads have much better exhaust flow than rectangular ports, which is why cam grinds tend to have more exhaust duration with a rectangular port. For optimum performance, changing cams is recommended, though not necessarily a must. (Photo Courtesy Comp Cams) WebThe GMPP head (PN 12363400) with 300-cc rectangular intake ports (left) performs very similarly to the oval port head (PN 12363392) with 290-cc intake ports (right), if both have the same compression ratios. The oval port head has 110-cc chambers, and the rectangular port head comes with 118-cc chambers. Open or Closed Combustion Chambers thermometer body rature
Square port heads? I found some square port heads a buddy has ... - reddit
Web11 Jun 2024 · The best factory cathedral port heads (243, 799, and 317 castings) flowed near 250 cfm, which represented a huge step up from the conventional small-block heads … Web6 Jun 2024 · After running the same setup with the LS3 heads, the 6.2L produced 826 hp at 6,700 rpm and 771 lb-ft of torque at 4,600 rpm. The gains offered by the high-flow LS3 heads continued under boost, but ... Web21 Mar 2012 · The 289LRRHR14 rectangular-port cam offered the same .624-inch lift, 239-degree intake duration and 114-degree LSA, but increased the exhaust duration to 255 degrees. LS3 cams typically offer a... thermometer body