We use OE Crank web cores from engines that had low milage/hours. Replacing pins, bearings, rods. To give your engine new life. Using Japanese bearings with Hot Rod Rods. We weld the center section and outer webs after truing webs, and re checked after. Which after market cranks don’t come with that option done. This helps prevent your cranks from waking and coming out of True or apart from high RPM harmonics or hard engine use from performance adders.
No crank cores required. 
Don’t forget to ask about our Teflon coated seal kits for RZ’s and Banshee. PV seals included for RZ’s . 
Drop us a message or call if any questions. 714-530-2215