We offer complete Eagle rotating assemblies UNBALANCED from Eagle so you can utilize your local shop and save money although we DO offer an option for balancing. Kits include main bearings, rod bearings, and file fit rings.
NEW 455 and stroker crankshafts available in traditional 2.250" and stroker 2.200" rod journal sizes, respectively.
What's the difference? Manufacturers are able to use pre-existing 6.7" and 6.8" BBC rods for a cost savings that we can pass on to you. Stroker assemblies utilize 4", 4.25" and 4.5" strokes while traditional long stroke Pontiacs utilize 4" and 4.21" strokes.
What do the BBC rod journal differences mean to you and the performance of your engine? For the average enthusiast looking for a street drivable engine combination putting out around 600hp/lb-ft, not much. But the available rod bearing over- and undersizes are nice, if one wants to fine tune their bearing clearances.
How about rod length? How does that effect the power curve? For an engine built to the Nth degree, it MIGHT make a difference, but for an engine only putting out 1.5hp/ci, cylinder wall loading would be of more significance. For a street/strip type build, I would rate that importance after cylinder heads, compression ratio, intake manifold, camshaft, valve springs, carburetor, ring pack, bearing prep, oiling considerations, balancing, and finally, which Pontiac blue.
What does a longer stroke do for you? First and foremost, it increases displacement and therefore TORQUE. It skews the power band lower in the rpm range by increasing the piston velocity as it moves down the bore, thereby increasing airspeed through the ports. Air speed in the 240 feet per second range corresponds with peak torque. The smaller the port, the faster the airspeed is for a given stroke. Therefore, the SOONER, in rpm, peak torque is realized. Increasing the port size and slowing the airspeed down, delays the point in rpm where peak torque is realized and, if your engine is built to take advantage of it, increased horsepower and rpm capability if so desired!
Again, what does this mean to you? If you have a 400 that needs to be rebuilt and want the simplicity of a stock type build, then the addition of a stroker rotating assembly is the answer. For late model Pontiacs built in the 1970's with their low compression cylinder heads, then a stroker will IMMEDIATELY increase efficiency by increasing the compression ratio! Have your machine shop lay the crank in the block and check for front counter weight clearance, then rotate the crank a few times to check for any other casting flash in the block that may cause any issues. Any interference can be quickly removed by ten minutes with a die grinder.