15/09/2026
BIG BLOCK TROUBLESHOOTING 🔧🔥
Paul’s tough old girl in for some dyno time, running a Speedworks-built 540ci big-block Chev controlled by a very nice Autronic SM4.
This one had an ongoing gremlin that had managed to slip through the last few shops. After a bit of digging, we finally tracked it down — the MSD rotor with adjustable phasing was slipping, causing all kinds of ignition timing mayhem. 😵💫
With the problem found and sorted, we could finally get the big 540 to behave itself and get on with the tune.
Always satisfying when you find the actual problem instead of trying to tune around it. 👌