Quote:
Originally Posted by BWeir49221
Does anyone have any experience to share regarding adding compression? If I run the 225 cam, I know the overlap will cause some compression loss, so what I want to do is raise the compression to where it will be back to stock level with the cam. I was recommended to run a .040” gasket, but at what compression will that put it at? I guess what I need to know is, does anyone know what compression drops to with the 225? I’m trying to plan it out to see if the heads will need milling as well.
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Here is a compression chart for a SBE LT1 posted by James @ GPI. Just a .040 gasket will put you just under 12:1. I know some have run 12.5:1 supposedly with pump gas but I believe that is with the best 93 octane in the country. Now if you are going to run E85 then it doesn't matter. Run as much compression as you can but you will run into PTV issues at some point. Don't quote me but I think .040 / .040 puts you on edge of PTV and that is around 13:1. There are calculators out there to figure this all out.