Now I am not sure about this but I think that all 4.6's are Romeo engines which are assembled at the Romeo plant. They are a little different than the Windsor engines, but do not remember what the difference is other than the heads.
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I think the only difference is the valve covers.
One has more bolts then the other.
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My 97 F150 has a 4.6 Windsor engine. It was made in the Windsor, Ontario plant. There are internal differences from the 4.6 Romeo engine in addition to the valve covers. Some say the Windsor engine is built with more strength.
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The Windsor triton 4.6 had floating wrist pins and a bigger con rod. The cam caps on the Windsor are individual caps and on the Romeo they are a ladder type. The number of cam cover bolts differ. The timing chain guides are different. The Romeo crank has 6 bolts and the Windsor has 8. The Romeo crank caps have cap cross screws and the Windsor has bolts. The Windsor main caps also have dowels. The Windsor 4.6 is a little beefier.
most of the trucks have windsors. the mustangs 4.6L are mostly romeos i have an all windsor truck it was made in canada someone on here gave me a website that reads your vin number and tells you everything about it i forget what it was ill go look for it
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