09-11-2011, 10:44 PM
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Club Cobra Member
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Join Date: Dec 2002
Location: Penn Valley,
CA
Cobra Make, Engine: Purchased CSX3225 in 1968 for $4,995. Original 428 car but changed to 427 MR about 20 years ago.
Posts: 238
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Not Ranked
My car originally had a 428. It was rated by Shelby at 390 HP. It had the same AA mechanical cam as the 425 HP 427 and an aluminum intake manifold, Ford 4 bbl carb, low riser 427 heads and 10.1 compression. I replaced the carb with a 780 3310 Holley and added Mallory dual point distributor and side exhaust. Running Dunlop rain road race tires the car ran 12.40 at 112 MPH in the quarter back in 1970 at Lyons Drag Strip (sea level). I shifted at 5800 rpm and sometimes ran through in 3rd gear at 6000 rpm. "Stock" SC Cobras ran 12.20 in magazine tests with race tires.
I'm now running a sideoiler 427, medium riser heads with a higher lift mechanical cam and 9.5 compression. It doesn't feel any quicker than the 428. The 428 got 15 mpg and the 427 gets 10-12. Since I don't have a roll bar I cannot run at the drags anymore so I don't know how quick the 427 is. In the early 70's I didn't need a roll bar. Most likely it's a bit quicker than the 428 but not by much.
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