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If you're concerned about 289 piston weight, use a longer rod. You could use a stroker rod such as a 5.4" or 5.315" and a piston with shorter compression height and lighter weight. You may have to use a Chevy piston and bore the rod small end to piston pin. Used to happen all the time when people mixed and matched parts to make a one-off engine before more parts became available, but it's more fun to do something a bit different.



The piston speed in a 289 is low though because of the short stroke so stock weight pistons are not usually an issue up to 7000 with ARP bolt equipped rods. 11:1 compression with the piston .030 in the hole means a loose quench and greater potential for detonation. Did you calculate compression ratio assuming the .030 "in-the-hole"?
 
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