is it by the #4 or #6 cylinder?

Eagle Driver:

FWIW, 7R's do crack behind the #3 cylinder in the rear case wall after sustained 7500 RPM usage. How long its lasts depends on how much time is spent in those RPM ranges and how many races you do per year.

I would not hesitate to keep a good spare 7R case around.

Sorry about the late reply, I was out of town for a few days. The crack was on #4. There is only one head stud that doesn't have a case through bolt next to it. That's the one where the case cracked. Thanks for the advise Steve. I keep the revs to 7300 max and normally shift at 7k.

-Andy
72 RS replica E stock racer

I don't know about a 4R case, but when I compare my 7R case with a 3R case there are a lot of reinforcements done. It seems to me that more is better in this regard.

3R

http://forums.pelicanparts.com/uploa...1072488575.jpg


7R

http://forums.pelicanparts.com/uploa...1072488596.jpg