one last thing will i be able to keep AC dont know where u live but gets hot in eastrern North Carolina and will be a daily driver.

 

yea you will be able to keep the a/c no problem...

 

the stroke difference isn't offset by the rod length. the static compression will be something like 12.3:1 because the longer stroke provides for a smaller piston-to-deck height.

 

The stroke is only 1.8 mm different between the LS and GSR cranks. The impact on compression would only be .2 compression points.

Since that is the case, JDM ITR pistons will yield a 11.3:1 static compression ratio with a GSR crank and 11.5:1 with an LS crank.

 

i used the zealautowerks calculator-- it hasnt failed me before.

using the ls crank with the jdm p73-00 pistons pushes the pistons up into the head gasket.. in terms of compresion i'm sure it is above 12-- i even calculated it out myself using the swept volume method and got 12.28

 

Ahhh, you are right. I forgot that the LS block has a smaller deck height than the GSR.

The C-speedracing compression calculator sucks. h:

 

it has the same deck height, it's just that the compression height on the pistons are higher and the that along with the extra stroke pushes it into the head, it makes the headgasket volume .5665cc, as you can tell theres it's past the first two layers and almost in the head. c-speeds calculator has been known to go awry when the pistons go past the deck.

:edit:
the deck hiehgt is different, but what i meant to say is that you already took care of that by saying the stoke is different.

 

the pistons are usdm type r pistons not jdm this will have a slightly lower ratio i think somewhere around 11.5/1. and deck height on gsr and ls are the same 8.347. stroke difference is ls 3.504 and gsr 3.433, ls has shorter rods though 5.394 compared to 5.429 in gsr. And also using b16 head cause it flows better has better valve angle and not so hard to find intake manifold i like.

 

you may want to recheck your info.

ls block/rod: 211.84mm/137mm
gsr block/rod: 212.39/137.90

 

the measurements i gave was in inches not mm and came from locale honda dealer.