273 Commando Slugs

Looking at the 273 Commando pistons on the engine I just took apart the 10.5:1 pistons appear to be quench pistons. They actually come above the deck and match quite well into the heads.

I never had pinging problems even with 87 Octane gas.

If paying for new pistons and concerned about the compression ratio, I wouldnt go and bugger them up. Just order a lower compression piston and reduce your HP.


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Edit: Not really Quench Pistons by definition, but have a small distance between the piston and the head. And matches to the head chamber. Because they come above the deck and fit into the chamber without matching flat areas to flat areas on the head, they arent quench.