Join Date: Jul 2008
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These are half the equation in my opinion.
In our high compression drag race engines we O-Ringed the block (cut a groove into the block and install a wire into the groove), used a malable gasket (copper is the norm) and machine a matching "reciever" groove into the head. When torqued down, the ring mashes into the gasket and into the reciever groove in the head, making a total seal around each piston bore. This works exceptionally well in high compression, supercharged or turbo engines!
With just a o-ring and a gasket you sill have the block surface "flat" and compression can still get past the flat surface. Not worth it in my opinion!
2004 F-250 CC Lariat FX4, 285/75/16 Goodyear Wrangler Dura Trac's, Full EGR Delete, ARP headstuds, Swamp's 58V FICM, SCT Livewire with Custom Tunes by Innovative Diesel and Quick Tricks Automotive, 4 inch stainless straight piped exhaust, High Idle Mod, Smoke Switch, more mods to come.