• Dec 15, 2017 · The heads were run with a Fast LSXR intake and 102mm throttle-body (we had both the cathedral and rec-port versions on hand). Also present was a Meziere electric water pump, QTP 13⁄4-inch long-tube headers and a FAST XFI/XIM management system.
  • Buy LS Rectangle Port Cylinder Head to Cathedral Intake Adapters (551317) from ICT Billet and browse through a huge selection of Made in USA LS/LT swap and conversion parts, manufactured at the state of the art plant.
  • 02:48. LS Heads - Cathedral Port vs Rectangular Port. 17:14. THE WORLDS MOST BAD A$$ Cathedral Port CYLINDER HEAD!!! 00:43. 03:16. Heads/Cam/Intake on an LS1: How Much Power?? 00:55. Fastest Street Cars LS2 + Trick Flow Specialties Top End kit.
  • Mar 29, 2011 · The intake was A+B puttied and port matched to the oval heads using rec port gaskets. I have no idea how close the original 325hp was to that advertised number and we did not baseline the engine, but it did make about 385-390 on a water brake with that mani, what would be considered an RV cam, and some work I did to the runners and bowls as the ...
  • Holley LS1 EFI Split Intake. (Cathedral Port) The new Holley single plane race intake manifold was designed with performance in mind. They feature a race bred, two piece split feature that was previously only found on the most expensive race intakes. The manifold will fit GM LS Gen III engines with cathedral port heads and are intended for 4150 style square bore flange carburetors or throttle body EFI.
  • The BTR Equalizer 3 is a square port intake designed for combinations that are looking to make peak horsepower between 6,000 and 8,000 rpm. Boosted engine combinations are actually more reliable making efficient & stronger peak horsepower in this higher RPM range compared to making peak power around 6,500 RPM like most stock style & aftermarket ...
  • But the much larger rectangle port heads sacrifice port velocity to gain high cfm of airflow. The rec-port 404-cubic-inch LS ran 11.70s in my '66 Chevelle but with this high-torque, longer-runner intake package and cathedral port heads - I think this could easily run 11.20's at probably 122 to 124...
  • Cathedral port vs. rectangle dyno results. What heads would you put on your engine? The red trace is the rectangular port LS3-style heads, while the black trace is the cathedral port heads. While there is a clear difference between the two above 5,000 rpm, we have to admit it looks like there might be...

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Oct 15, 2018 · The intake ports also seal to the heads with supplied O-rings. The manifold is designed around a 4150, standard carburetor mounting flange that will accommodate up to 1.750-inch throttle bores (which is 1,000 cfm territory) and the carb pad height is plenty tall at 3.28 inches.
Construction year: 08/82-12/86. Just trying to learn how to do things. (Note: this is for radical engines only!) Larger fuel pump required for all 383 engines. Find your yodel. Product group: Engine / Gaskets. Engine Oil Level. J2 intake. Stock Intake Manifold Comparison. Ford Tunnel Ram Intake Manifold 351c Redline 2v Cleveland Race Dual Carb ...

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Intake ports are cathedral, exhaust ports are D. This excerpt..... High-Flow Cylinder Heads and Valvetrain: the L96’s cylinder heads feature “cathedral”-shaped intake ports that promote exceptional airflow. They’re derived from the high-performance cylinder heads that were used on the “C5″ Chevrolet Corvette Z06 and support great airflow at higher rpm for a broader horsepower band, along with strong, low-rpm torque.
Available for LS engines with rectangular or cathedral port cylinder head configurations, Holley's Single Plane Mid-Rise intake has a power band ranging from 2500 through 7,000 rpms with a square bore mounting flange that can be used with either a four-barrel carburetor or EFI throttle body with throttle bores measuring up to 1.75-inch diameter.

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LSX RT Injection Molded Polymer Intake Cathedral-Port Head Equipped Applications. Designed specifically for GM 4.8/5.3/6.0L cathedral port cylinder head-equipped truck engines and cathedral port LS1, -2, -6 applications where hood clearance is not a concern, the FAST™ LSXRT™102mm Intake Manifold follows the path chartered by the original FAST ™ LSX™ Gen III Intake by featuring a ...
Fits GM LS1/LS2/LS6 w/cathedral port heads; ... 4150 Square Bore Carb Flange; Holley_Intake Manifold_GM LS3/L92_Dual Plane_Carb_4150 Square Bore Flange