I posted longk ago that the exh pulses will interfere in the "Y" in each head, and real bad if a plate is used to block. When EXH crosses-over they interfere with 1-one other CYL. Fill the "Y" to remove heat and reversion caused by the crossover. Of CYLS 4-3-6-5, fill the "Y" completely for best Header (and Manifold!!!) performance.
Yet a torque tube can also occur, if wanted by filling half the "Y". Reversion remains greatly suppressed too. Fill the branch of the "Y" for 6 & 3 to the EXH bowl window.
Reversion mitigation is important. If you run a RA-IV or bigger cam than factory, then i strongly recommend either crossover fill for best results.
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95 Towncar that needs more TQ.
Sold 2023: 12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct
Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct
Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct
Last edited by Half-Inch Stud; 05-27-2026 at 07:37 AM.
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