Crazyeights Posted July 4, 2010 Share Posted July 4, 2010 Several search's yielded a lot of information about pistons that can be used in EA81 blocks. I didn't see the actual factory part number for the EA82 SPFI (9.5 STD Bore) pistons listed. My parts manual lists one number for all four pistons 1989 SPFI/MPI and different LH and RH numbers for a 1990 loyale with SPFI. Which part numbers are correct for use in an EA81 block? Thanks Link to comment Share on other sites More sharing options...
LeoneTurbo Posted July 4, 2010 Share Posted July 4, 2010 Why do you want to use different pistons? If you plan to use the EA81 heads why not stick with the EA81 pistons or do you want to increase compression ratio? Link to comment Share on other sites More sharing options...
Crazyeights Posted July 4, 2010 Author Share Posted July 4, 2010 (edited) I built 1 solid lifter EA81 already with 1600 pistons (higher compression) and a delta cam and it turned out VERY well with GD's SPFI. Since that build I found a really nice low mileage EA81 Hydro block and I might want to do a second one. From what I have read the EA82 SPFI pistons are the ones to get for higher compression (slightly better than the 1600 ones). The Hydro block has already been diamond-honed and pressure washed and the machinist said STD size pistons will be fine. Edited July 4, 2010 by Crazyeights Link to comment Share on other sites More sharing options...
LeoneTurbo Posted July 4, 2010 Share Posted July 4, 2010 RH SPI piston 12013AA030 grade 'B' LH SPI piston 12018AA030 grade 'B' Link to comment Share on other sites More sharing options...
Crazyeights Posted July 4, 2010 Author Share Posted July 4, 2010 Many Thanks! That confirms what my info said. Do they list a different number for "A" size? Link to comment Share on other sites More sharing options...
LeoneTurbo Posted July 4, 2010 Share Posted July 4, 2010 No, strangely enough there are no A pistons listed on my official USDM factory parts CD. The 020 part number is for second oversize carb piston and the 040 is for the first oversize SPI piston... Link to comment Share on other sites More sharing options...
Crazyeights Posted July 4, 2010 Author Share Posted July 4, 2010 Thanks Again. There isn't that much difference between the A and B sizes anyway. For what I am doing they will be fine. Link to comment Share on other sites More sharing options...
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