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Old 08-30-2007, 04:49 PM
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427w.. 408w..?

I was considering building a stroker 351.. i figured if you're going to buy new rods, pistons, and crank.. why not go with the biggest displancement you can.. But then i question how come these motors are not common.. (427w that is).. If you're into fords you've probably heard of a 408 most commonly for a stroker application for a 351.. My quesiton is how come most people don't go with the bigger setup..? Is there something a 427w lacks? Or does the 408 just whined out better? Anyone got any input?

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Old 08-30-2007, 05:25 PM
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Your forgetting the 393. I think this would be the most reliable of the 3.
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Old 08-30-2007, 06:44 PM
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There is debate on this subject, but as you increase the stroke, you decrease the rod length. In effect, you hurt your rod to stroke ratio. As for the effect on horsepower, many chat room pages have been sacrificed to that. As for reliability, I think it is pretty much accepted that a poor rod to stroke ratio reduces overall engine life due to increased cylinder wall loading. As for what is a good ratio, a 5.7" rod chevy 350 (a tried and true combo) has a 5.7/3.48= 1.63. This is my only guess as to why you would not want to stroke it that for. The only other thing I can think of is if clearance gets to be a hassle.

Adam
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Old 08-30-2007, 10:08 PM
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The 427 puts the rods into the cam tunnel. Reduced base circle camshaft and/or grinding the rods for clearance will be required

4.1 stroke (418) is more friendly to assemble.
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Old 08-30-2007, 10:25 PM
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I was wanting to make a 393 actually but then i ran across the problem of the stock rods.. If i upgrade the rods.. then i should just go all out and make it even bigger cubes.. But this is just the information i've heard before.. The stock rods would only be good to 3-400 hp..?
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Old 08-31-2007, 08:27 AM
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Quote:
Originally Posted by firestone
There is debate on this subject, but as you increase the stroke, you decrease the rod length. In effect, you hurt your rod to stroke ratio. As for the effect on horsepower, many chat room pages have been sacrificed to that. As for reliability, I think it is pretty much accepted that a poor rod to stroke ratio reduces overall engine life due to increased cylinder wall loading. As for what is a good ratio, a 5.7" rod chevy 350 (a tried and true combo) has a 5.7/3.48= 1.63. This is my only guess as to why you would not want to stroke it that for. The only other thing I can think of is if clearance gets to be a hassle.

Adam
True but. You could keep the same rod length and decrease the height of the piston. But the thinner the distance from the top ring to the top of the piston could make it more prone to breaking.
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Old 08-31-2007, 08:49 PM
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Quote:
Originally Posted by scottford351
The 427 puts the rods into the cam tunnel. Reduced base circle camshaft and/or grinding the rods for clearance will be required

4.1 stroke (418) is more friendly to assemble.
That's the reason I bought the 408 kit. The only grinding I should have to do is a little at the bottom of the cylinders so my rod bolts will clear.

I think there is an aftermarket block with a bigger bore and you can still use the 4" stroke to make a 427. That would be a whole lot more money though.

Danny

Last edited by Kampr; 08-31-2007 at 08:50 PM. Reason: add info
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