How To Build A Crate 427 Windsor Engine Thermactor Port Plugs
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15. Thermactor port plugs (#TE-3818 from Parts Dinosaur must be installed unless you are running a smog pump (yeah, right…). External thread is 5⁄8-inch at 11 threads per inch. Internal thread is 7⁄16-inch at 14 threads per inch. View Related Article
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