The heads are being put on now

MOPEkidD-3 said

Am I seeing that pic wrong or do you have the open-chamber models for use on original high-comp 340s with pop-up pistons? If so I might argue that's a step in the wrong direction they're only 2 cc's bigger in volume but you lose all your quench Your engine is really clean btw doesn't look like there was any detonation serious enough to make any noticeable damage

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They are the 65cc heads same as the original heads (think I should put the 12.5 pistons I had in originally ? ) , that's what the shop ordered , if they don't make enough power on the dyno we will look at options . They have their Duster running 10.3 , who am I to argue with success ,they know more about this **** than I do so I follow their lead . Nothing written in stone . Depending on dyno results cam might be changed as well , very mild cam in it now , easy to change while out and testing . I am just aiming for super reliable street car that will run high 12's , and use cheaper gas , 94 octane is 20-30 cents a litre more than 89 octane 60+ litres a tank ads up .
The pistons were clean , looks like it was running well but I did see a few marks on them indicating detonation , nothing serious . sure don't look as good as when they were put in though .