hey guys,

I have been thinking about going to F/I. I don't really want to swap out pistons too badly. So was thinking about doing a head swap they need upgraded anyway. Going from a 63CC prc 2.5 5.3L head to a 72cc chamber how much compression would i drop. I was told that i am sitting about 11.25:1 with the PRC's and that's a little high for 92-93 premium... my viable option

 

found a compression calculator and it's down to about 10.3 from 11.4

 

is that with the stock head gasket? i would get a thicker head gasket and see if you can drop the compression under 10:1, closer to 9.5:1 if possible. why dont you get the chambers smoothed up and widened to a 4" bore to allow more chamber volume?

which heads are you going with anyway? 317?

 

Im not sure what heads to go with yet? haven't looked very much yet, i think needing 72CC chambers kind of limits my selection.