Reply to "stroker motors"

Severely rearranging the innards of an engine with a stroker crank can be done various ways. First, the crank counterweights must be cut down to miss the sides of the crankcases and the oil pump castings. This is counter to what the engine needs to balence the engine, so most shops cut the crank & grind the cases the absolute minimum, then use slugs of Mallory-metal (a tungsten alloy) to get things balenced again, at more expense. The drilled holes for the heavy metal slugs must be drilled parallel to the crank, not the "easy way" down into the counterweights, as centrifugal force WILL sling verticle slugs, even if welded in, out through the pan (or block) like missles at higher rpms. The wristpin rises up into the ring stack unless you have custom pistons built. If you choose to use some sort of "stock" piston for economics, the oil control ring can be supported by two aluminum plugs in the wristpin hole, with a section of ring groove machined in each, or a steel support ring under the oil control ring. Both work for short periods; it depends on whose pistons you use as to how they do it. Both are drag-race mods which implies very frequent rebuilds. Note the plugs do not take the place of pin locks like Spirolox or E-rings, as 99% of strokers use floating wristpins for more convenient rebuilds. Finally, unless you use ultra-premium parts and clearance the bearings for it, the redline on a stroker motor will be lower than what you had stock, so a rev-limiter is a good idea Some cheaper commercial stroker cranks are cast-steel made in Taiwan, rather than much stronger forged steel units. The ads often only say 'steel'.... There are other problems with some combinations, involving the rods and the cam lobes interfering with each other, too. I suggest you contact an engine builder who has actually put one or two of these things together successfully, rather than trying to accumulate a bunch of parts yourself, and learning expensively what doesn't work. This is really Advanced Engine Building 101, not just a quick overhaul.