The 4.250 stroke pulls the piston pretty far out of the bottom of the cylinder even with a 6.200 rod. As a "weekend only" deal I don't see a real big deal. As a "daily driver , highway cruiser" longevity WILL be an issue. The combination was never meant to be a "high mileage" deal.
Randy

 

cool..

 

For those of you keeping score , the rod to stroke ratio is a "terrible" 1.458. When used in a BBC ( common) , the taller (9.8) block allows a 6.385 rod which is still "only" a 1.502 ratio. FAR from ideal. Both make a 347 that everyone worries about pretty good looking at 1.588.
Randy

 

I did this and have been very happy with everything. Awesome torque and HP. I went with a fairly mid cam and left a lot on the table with a pump gas tune.
The car is a handful, but a blast to drive.

Ford Mustang 460 Stroker Small Block Motor Fast EFI 600+ HP - YouTube

 

I did this and have been very happy with everything. Awesome torque and HP. I went with a fairly mid cam and left a lot on the table with a pump gas tune.
The car is a handful, but a blast to drive.

Ford Mustang 460 Stroker Small Block Motor Fast EFI 600+ HP - YouTube

nice bro

 

Yes , I am aware of that but they still come out of the block at BDC . I deal with this every day in my "day job". Even a switch to a 6.300 rod doesn't help much. A 4.000 stroke does keep the piston in the block.

 

I went the Dart 427 Windsor route. A 4 1/4" bore and a 4" stroke with 6.2" rods for my street car.

 

The piston speed must be wicked.

 

Lots of torque to say the least!

 

With 470 hp at 5300 RPM and 570 ft-lbs at 3900 RPM I am not worried.

 

About the same numbers as my 87 octane 408 daily driver.

 

Rod to stroke ratios.
302=1.696 347/363=1.588 351W=1.70 408/427W=1.55 460W=1.459. "perspective"- BBC 454=1.53 BBC 496=1.50. Put an aftermarket aluminum head on a 460 and it's no longer a dog. I have a couple of 521s and a 545 that "might " surprise you.

 

stroked to 557, an effortless 500 hp / tq at 5,400 rpm.

 

I kept my bore at 4.390 so it's only a 545. Should make 700 on 91octane.

 

Just a comment. Is there a problem? If so send me a PM so it doesn't involve anyone else.