Not Ranked
Aluminum is probably the right material for a road race application like a Cobra. The Fidanza is readily available (normally - they're on backorder right now with a January delivery date...) for under $400 and will work fine.
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Survival Motorsports
"I can do that....."
Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP
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