Quote:
Originally Posted by Bob In Ct
The last engine I saw by Roush came with Motorcraft AGSF32C (SP-447) plugs.
Bob
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My Roush 402SR/tw came with Motorcraft AGSP32C plugs. Roush's website mentions the Autolite 3923 as the standard plug. Very minor difference, but the Autolite equivalent is the 4924.
Seems to run fine with the Motorcraft plugs, so I'm going to stick with them for now.