dats a pity man, were u drivin when it died? was an rb24 in d makings meself, but it doesnt use rb25 pistons, tink ur wrong dere, even with ur rb 23.

rb20 bore size is 78mm. . .
rb25 is 86 mm i tink, doubt dey bored it out 8mm,
some use 4agze pistons(81mm) with rb25/26 crank rods mixture,
i got some tomei 272 cams, springs, solid lifters with special tomei rb24 (82mm) pistons with gtr crank and rods.

pity she died neway, u shud try make her up as rb23/4 again, cool engine. sorry to hear its gone. hope u get sorted