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  #1 (permalink)  
Old 02-22-2012, 06:12 PM
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Default Difference between 390 and 427

I am looking to purchase a Superformance Cobra. I have been looking for one with a 427 FE but found one with a 390. Other than the obvious, what is the difference between the two? Thanks!
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Old 02-22-2012, 06:24 PM
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Originally Posted by krkucin View Post
I am looking to purchase a Superformance Cobra. I have been looking for one with a 427 FE but found one with a 390. Other than the obvious, what is the difference between the two? Thanks!
About 100 HP in stock form - but that is obvious. The car doesn't know what FE is going into it - shouldn't be any other significant differences in the car. A 390 can be warmed over to move a 2700 lb car pretty well.
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Old 02-22-2012, 06:34 PM
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A huge difference in price. A 390 is a little closer to a 428 or 427 center-oiler. Vast difference to Side-oiler. Don't overpay.
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Old 02-22-2012, 07:59 PM
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A huge different in price.

The 390 has a 4.05" bore and a 3.78" stroke. good low end torque motor.

The 427 has a 4.23" bore and a 3.78" stroke. Great high rpm motor.

The first 427 had 390 truck motor crankshaft but they broke very quickly. Ford made better crank and it broke, then a much better crank till 1965 they had a crank that would last 24 hours at 7500 rpm.

The blocks were improved every year till they could last 24 hours.

The 390 is a great motor for a street Cobra. But the 427 is the holy grail of Cobra motors.

The big different's is the price.
A 390 block may cost $100 but the 427 would be closer to $2000.
And the crank and pistons cost a lot more in the 427.

Remember most 427s had the hell beat out of them and a lot have sleeves or other repairs.
Make sure you get what you pay for.

Dwight
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Old 02-23-2012, 12:01 PM
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37.





.
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Old 02-23-2012, 01:27 PM
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37.





.
That made my laugh.
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Old 02-24-2012, 09:51 AM
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Beat me to it !!!
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Old 02-24-2012, 10:12 AM
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That made my laugh.

what's even funnier is i had no idea what he meant by 37......

about ten minutes later it hit me.....
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