They may have a lot of the exact same qualities as bridgeports besides there is no Interruption while in the move route, only one major hole much like the exhaust port. Using this set up primary side ports are shut off and it's necessary to build a custom intake manifold. https://beckettptspk.affiliatblogger.com/80898964/the-ultimate-guide-to-rx7-13b-motor-for-sale