I had a Shorrocks supercharger fitted to the 1300 crossflow on my Escort Sport back in the early 70's. A big SU fed it. I remember it seizing on the A40 after I had fitted the recommended slightly larger oil feed metering pin following running in. It was replaced without issue with a recommendation to leave the running in pin there. Got home fine with seized unit although limited top speed.
Performance was at least equal to Mexico and leaving MGB's behind.
Following some bodywork damage, I remember quickly removing it before the insurance accessor turned up
