the compression on that 91 block and 20 head has got to be close to 12:1 
Is this with the flat top pistons , or domes
I assume your talking about flat tops , because I would think you would have to cut valve reliefs if you use the domes.
I would have thought if you ran a 20r head on a laser block with flat tops the compresswion wouldn't be near that high . I know your decking a lot off the head , but it's still a dome head and the flat tops are designed for a closed chamber head which is a lot less CC's. Does anyone know how many CC's a decked 20R is compared to a closed chamber 22r.
Also I'm working on an adapter to put the 22re EFI intake on a 20r head. I'll let everyone know how it turns out. If it works I'll be building several if anyone's interested in buying one.
