393 stroker build questions-block machine work
Here are some general guidelines concerning strokers, though. There are disadvantages in trying to get the most stroke possible out of a motor, ( which pretty much describes a 427ci 351W).
As the stroke gets longer, the piston moves further up and down in the bore. This causes several problems- the piston must get shorter to clear the crank counterweights and the heads at the top of the cylinder. The rods must get longer to keep the piston skirts form hitting the counterweights.
As the piston gets shorter, the area for piston rings becomes smaller. In some instances, the distance between the top ring and the top of the piston is so close that the top of the pistons are weak and tend to break off.
The top of the piston ring area is shorter and doesn't transfer heat as well.The skirts are shorter, which makes for less stability and can cause sealing issues.
Along the same lines, as the rod gets longer, it pushes the pin further up into the piston where it starts intersecting the oil rings and the pin is closer to the heat created by combustion , which shortens it's lifespan.
The extra length of the stroke increases piston speed, which puts more force on the moving parts at the same rpms and again helps shorten engine life. The extra stroke can increase rod angles which puts more stress on the skirts and bearings.
Extreme strokes call for extensive clearancing. (This is where you see the pictures of big chunks taken out of the bottoms of cylinders and the sides of blocks.) You can also run into cam to rod problems with certain cams, this is where the Chevy guys start grinding away rod bolts.
This is why I don't know a lot about 427 stroker kits, I don't want to deal with those kinds of issues.
As far as gas mileage, you can put together a mild build and actually gain a little MPG. But when you increase displacement, you increase fuel consumption and when you increase displacement, increase performance, and put your foot in it.... well, you can't have your cake and eat it too.
It's another thing I haven't looked into that hard. The truck has a stock 2barrel 302 in it now, and if I was that concerned about economy, it would have a fresh one with an economaster going back in it instead of a 399 stroker with a 750 CFM 4 barrel.
I used a Gateway and I........ oh, sorry,... thought you were talking to me.
Ford Trucks for Ford Truck Enthusiasts



I`m using the MAF coversion kit from Ford but went w/30lb injectors and a Summit mass air meter.I know you cant use a computer from a standard trans or it will burn it up