Join Date: Jan 2006
Location: Orlando Florida
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The 1/4 in tap for the back of the heads is too small for anyone doing this you will need to go to a bigger size
Are referring to blocking the Thermactor (air injection) ports in the back of the cylinder heads?
There are plugs available to block these ports - or I have heard that filling with high-temp RTV also works.
1982 F-250 XLT 4x4, 5800lbs, C6-BW1345, 466 cid, 9.5:1, TFS290 PowerPort heads, Crane Hyd Roller Cam (278/286 adv., 216/224 @.050), Edelbrock Performer, Hedman headers, QFT HR-780VS, MSD6A and Billet dist., NOS Cheater system, 4.56 gearing, 7" lift, 37" tires.
Last edited by 4604X4; 08-08-2017 at 12:11 PM.