Stop in for a cup of coffee

halifaxhops said

Something is not right. What book did you use? The cards go 270 then to 325? First time I found a issue with them.

Click to expand...

There has been a lot of conflicting info on this subject. Mostly because of the restrictive exhaust manifolds. I think the 67"s were more restrictive than the 68's. Thats why most 68's are rated higher HP......