67belevdere/225
Well-Known Member
what did the factory have as the red line on the six at anybody know?
"But say you shift it at 5000. With 2.94s,26.4 tires, and 5% TC slip, this will be about 47mph"
when i hold it in 2nd gear I'm doing 75 mph about @ 5000 not 47
I am not sure this has been noticed but the above statement is backwards..... You should advance the cam timing to get more low RPM torque. I disagree on moving the cam 3 degrees... it will make a noticeable difference but not a huge one with just 3 degrees change. I don't know this cam's ground-in advance, if any, but going to an ICL of 106 or even 104 is the kind of recommendations I have read (and which make sense with any moderate compression ratio engine if you want better low RPM torque).i think I'm going to retard the cam to get more at the bottom end and less at the top .
yes, i meant it was too advanced !I am not sure this has been noticed but the above statement is backwards..... You should advance the cam timing to get more low RPM torque. I disagree on moving the cam 3 degrees... it will make a noticeable difference but not a huge one with just 3 degrees change. I don't know this cam's ground-in advance, if any, but going to an ICL of 106 or even 104 is the kind of recommendations I have read (and which make sense with any moderate compression ratio engine if you want better low RPM torque).
I also don't think the HP peak will be at 5000 RPM with this head and cam; there is 56 degrees difference in the advertised duration and the .050" lift duration... it is not a big cam. So that changes the numbers on RPM's at shift points and TC stall.
I get about the same numbers as above for 2nd gear at 75 mph. (I used 25.5" tire diameter to account for the radial flat shape on the ground.) If you're actually near to 5000 RPM at 75 mph in 2nd gear, then it may be that you have a 3.31 rear gear....??Of course the tach could by lieing too,I suppose. If 75=75 and 2.94=2.94 then the tach should be reading 4072 plus slip. At 5% slip, this would be 4276rpm.