The Ford Barn

40cpe · 01-08-2016, 03:33 PM

8CM heads on 3 5/16 X 4 block. I know they aren't the best choice, but they are what I have. There is no interference when placed on the bare block. With a new gasket torqued to 20 # to measure the clearance I have the tightest measurements of .068" on the edges of the piston and .100" at the dome. The Best fiber gasket now measures about .058" so I think I have about .005"-.008" to compress it. Should I cut enough to get about .040" clearance around the edges or cut more to tighten up the dome and then cut for clearance around the edges? Thanks for any advice you have.

01-08-2016, 03:33 PM	#1
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,120	How much should I cut these heads? 8CM heads on 3 5/16 X 4 block. I know they aren't the best choice, but they are what I have. There is no interference when placed on the bare block. With a new gasket torqued to 20 # to measure the clearance I have the tightest measurements of .068" on the edges of the piston and .100" at the dome. The Best fiber gasket now measures about .058" so I think I have about .005"-.008" to compress it. Should I cut enough to get about .040" clearance around the edges or cut more to tighten up the dome and then cut for clearance around the edges? Thanks for any advice you have.