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My book doesn't have a listing for that casting number. The last 4 numbers should be 6090 not 3090. If it were a C5AE 6090R then it would be a 427 medium riser head. Check the valve size.
TP is right, C6AE-R are excellent heads for performance. Cut the throats for CJ valves, a little pocket porting and cleanup of the exhaust port and you practically have CJ heads!
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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