[DAVID GAGNARD]

Dan;

Some call them "eyebrows" but they are valve reliefs.....You can get pistons with four reliefs or two reliefs or actually one big/long relief,they come in all shapes and sizes..........The four reliefs would be more suited to your build.......

Yes you will have to find out just how much your block will need to be bored before ordering your pistons.......Usually if the block does not have too much wear they will bore it .030..... Once that is determined I like to order my pistons because different pistons call for different clearances and your machine shop will need to know the final specs to hone the block to........

Usually,but not always, the two valve reliefs and the one long one will give more compression,just depends on the piston....... You can call the piston manufacter and find out the cc's of the piston before hand and that will also help you determine compression ratio......

Dish pistons will lower your compression ratio quite a bit,probably more than you would want............

David