Eagle 4" 8BA Crank?

[Ol' Ron]

Mike is right, it takes air to make hP. However I have a "stock'280 ci engine in my truck. It has astock valves and ports. Milled EAB heads.eab cam, 2gc carb and a dist by richard. The compression is close to 9:1 and the torque is increadable. I have a 3spwith OD and a Spicer 44 3.74 rear. The drivability is fantastic. Yes those 4" cranks sure do work. Gramps

[flatjack9]

For a street driven engine, torque is king.

[KiWinUS]

I’m with FlatJack. Having driven many stroker flatheads some built by me some by others. There’s no comparison. Strokers rule.

[Pete]

Originally Posted by FL&WVMIKE

Airflow is what dictates maximum potential horsepower. You could bore/stroke a flathead out to 500ci, and it wouldn't turn over 1200 rpm before it was maxed out in the breathing department. Only thing it would be good for is a tractor. Horsepower requires airflow. Once the airflow path is maxed out, it's simply maxed out.

We'll ignore the 500ci reference, as it was only to make a point. When an engine has limited airflow, adding more displacement doesn't make that much more peak horsepower. It's main effect is lowering the rpm where peak horsepower is made. It also tends to add torque.

If you have an airflow limited engine making 200 hp at 5000 rpm, and then add stroke... It will likely still make 200 hp, but do so at let's say 4500 rpm, while adding more average power below that peak.

Don't forget, there are 2 MAIN things that alter the RESULTS of the maximum flow through a given port and that is pressure and the composition of what is flowing......

[leon bee]

So Ford 8BA rods would be okay with one?

[Ol' Ron]

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I think we all like to consider say, 91 oct fuel and a normally aspirated Carb or EFI. The amount of fuel and air necessary to make 200 HP is beyond comprehension. Especially when you consider the fact that AIR is only 20% oxygen . The rest just goes along for the ride. I'm sure it can be done, but it eludes me.

[Krylon32]

I'm no FH guru like you guys but when I put the Roadrunner blower with 2 94's on the 276 motor in my one of my deuce roadsters it came alive. More air definitely helps. I would do it again with my French FH but to my knowledge Joe's not doing anymore.