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These bushings can be used as a last resort option instead of replacing your cylinder head on Ford Modular engines. This bushung is NOT intended for 3-valve engines. If you repaired your spark plug thread with a thread repair kit, and it blew the adapter out, this big beefy adapter can fix the thread one more time. This adapter is made with SAE Coarse threads, and will anchor deeper into the head than the metric fine threads. These adapters will NOT screw all the way thru and fall into the cylinder.

Choosing the right size . . .

Oversize Bushing If your spark plug hole is blown 21/32 (.660") or smaller, you will need this oversize 3/4" Bushing. External thread is 3/4-10 Internal is 14mm x 1.25 pitch (same as factory spark plug thread) Overall length is about 7/8". This bushing comes with Priority Mail shipping included in the price of $55.

Mega Bushing This extra large bushing is for extreme blow-out or if the hole blew crooked and made your plug hole egg shaped. If your spark plug hole is blown out bigger than 21/32 (or .660"), you will need this extra-large 7/8" Mega Bushing. External thread is 7/8-9 Internal is 14mm x 1.25 pitch (same as factory spark plug thread) Overall length is about 7/8". This bushing comes with Priority Mail shipping included in the price of $75.

These adapters will NOT screw all the way thru and fall into the cylinder. Contact me for a price on shipping outside of the U.S. Disclaimer: No guarantee or warranty expressed or implied with these adapters. You are buying a bushing to use as you see fit.