Edelbrock just need to admit that they have an issue with rotor phasing because they’ve set it up to have perfect alignment at 12 degrees and used a narrow rotor that will struggle to work correctly at normal total timing figures.
Their Super Moderator is in denial & is happy to latch on to any other reason for the issues being experienced - timing chain stretch and moving the drive by one tooth has got nothing to do with poor rotor phasing.
