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Junior User
Joined: Sep 2001
Posts: 70
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From: Simi Valley United States
Quick Question
[updated:LAST EDITED ON 02-Jul-02 AT 00:41 AM (EST)]Does a 427 (Not including the side oiler)have the basic configuration as any other FE? Like will 427 High Riser heads fit ona 390?
Thanx in advance.
Bri
Thanx in advance.
Bri
Post Fiend
Joined: Feb 2000
Posts: 5,130
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From: Brea CA
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Well, the 427 head will fit the 390 but the valves will hit the cylinder walls. On the 427 head the valves are bigger and spaced wider apart, the 390 bore is just too small in diameter. To make a notch big enough it would break into the water jacket.
Barry
Barry
Senior User
Joined: Jun 2002
Posts: 110
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From: Tulsa usa
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first, Baryy is right on about valve size issues, in addition, High rise and tunnel port heads had their own unique intake manifolds and must be used in conjunction.
Early 427 heads (C3 vintage) are excellent for swaps though as they are basically the same as 428CJ heads. In addition, they require no special intake manifold.
One thing to watch for when swapping heads though is the bolt pattern on the exhaust ports. The 390GT and 428CJ used a horizontal exhaust bolt pattern, that is what allowed those engines to be used in the smaller Mustangs and Fairlanes. Putting an early 427 head in those bodies requires headers or the ULTRA RARE 427 Fairlane cast iron baseball glove exhaust manifolds.
Early 427 heads (C3 vintage) are excellent for swaps though as they are basically the same as 428CJ heads. In addition, they require no special intake manifold.
One thing to watch for when swapping heads though is the bolt pattern on the exhaust ports. The 390GT and 428CJ used a horizontal exhaust bolt pattern, that is what allowed those engines to be used in the smaller Mustangs and Fairlanes. Putting an early 427 head in those bodies requires headers or the ULTRA RARE 427 Fairlane cast iron baseball glove exhaust manifolds.
Senior User
Joined: Jun 2002
Posts: 110
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From: Tulsa usa
Quick Question
one more thing, the 427 (even the side oiler) and the 390 are the same except for the larger bore of the 427 (4.23). No, 390's cannot be bored out to 4.23 The 427 did use the crossbolts etc, but all of the bearing sizes, reciprocating mass ect all have the same dimensions. Most 427 sideoilers used steelcranks, but most topoilers, even the marine versions (which was the sideoiler machined as a topoiiler) used cast cranks.
