Agreed. The devil you know is much better than the angel you don't know. You also have the option of upgrading to high lift cams / high compression pistons / porting and polishing the head while doing a rebuild which will guarantee better performance.Maybe. Since we don't know what the actual problem is, so there can be several options to consider. You are looking at a used engine to buy and it could go either way. Yes if the head is damaged then best thing is to replace with another engine. If repairable personally I would go for a rebuild and I had done that in the past.
@hrm what's the issue with remapping at a dyno with wideband O2? I've done standalone ECUs (HKS F-Con V Pro) as well as Remapping (for lancers) and with great success. I'm just curious... Maybe something specific to 240?
------ Post added on Apr 30, 2021 at 9:28 AM