piston dome size need help

[GreenLS6]

Used to build alot of "781-049" big oval port Large valve 454 and 489 ci Motors for people, 15-20 years ago. Used the TRW Ls6 replacement piston (or speedpro equiv ), 3/8 truck rods ARP rod bolts, cast or forged crank ( Cast 8lbs lighter plenty strong and cheap) with felpro Blue .041 head gasket. end up true comp. 9.8-10.1 range. You do have to releive the edge of the chamber about .030-.040 thou.. Hits very edge of dome on some heads due to core shift( always check!!!)

The 489-496 motors I would mill about .085-.100 off the deck face of the piston(not dome) to acheive a postive +.005 out of the hole, then run the same .041 head gasket for optimum quench of .035 thou. then run the Comp cam 288AR solid roller .623 lift. Super torque and almost 600hp. <span style="font-weight: bold">CHEAP!!!!!</span> Street monsters

[GreenLS6]

Sorry forgot cc's trw 2349 LS6 piston was 30cc if i remember, the speedpro 2365 was like 26ish.

For those wondering 1/4 inch more stroke how doesn't it hit?? 1/2 of 1/4 inch more stroke is .125.... mill deck face .085-.100 depending on pistin in hole DECK height. leave .005+ out of hole so you can run Cheap but good head gasket for optimum quench(Free 5hp)

Lots of good pistons out there now that are great ,cheap open chamber designs. Didn't have them back then.

[1968BM]

Now this is sounding more like what i need to know. Right now i have a 454 stndard bore with a forged crank and flat top pistons, and 049 heads. I have to get cylinder 4 sleeved and put back to standard bore. I dont think i can get enough compression out of the flat tops to be where i wanna be without out nitrous or supercharging. That is why i want to go with a forged dome piston. Now my question is this what sized dome can i put under the 049 heads? My other option would be to build a 427 out of it.