Aluminum Head Nipple Restrictor Mod?
It's been mentioned here several times that a restrictor should be inserted in the hose from the passenger side head to the heater core, particularly when using aluminum heads as the nipple screwed into the head does not have a restriction. Sometime ago, I saw a post showing a pipe plug screwed into the threaded end nipple. I'm curious what was done to accommodate a pipe plug as a 1/4" is too small in diameter and a 3/8" is too large?
Pic of the type of nipple that goes in the aluminum:
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Will Rivera
'69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
'69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress
‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here:
https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb
Last edited by grivera; 09-02-2025 at 11:50 AM.
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