On May 24, 8:08*am, jamesgangnc wrote:
On May 22, 9:17*am, "*e#c" wrote:

On May 21, 5:07*pm, bpuharic wrote:

i dont think mine are...but just curious about the warning signs...

Are they used in Salt, or Fresh Water?

Cracks on the outside ( you'll see rust stains ) . Cracks on the
inside are hard to immediately see. Over heating is a sure sign. Using
clear tubing while idling...do you see any bubbles passing through? I
just rebuilt my 40 year old Risers over the winter. Soaking them in
Pickling Vinegar worked great to clean them out. After that, I scored
out the cracks very slightly with the Dremel, and put a nice coat of
JB Weld over top, followed by a coat of Tremclad white.The finishing
touch was to paint the Exhaust Stubs with High Heat Enamel. They do
look nice now.

You need to buy some new risers. *JBWeld is not going to stay in
cracks, the expansion coefficient is to different. *You're just asking
for problems.

Thats funny, because the last application lasted TWO YEARS without
water penetrating through it. And the only reason I removed that
application, was to boil them out. I've had that statement said to me
before.
It has also lasted over two years on the block cracks the engine has .
I check them constantly. Are you getting your information first hand,
as in your experience...or just heresay?
If its first hand, you didnt clean the repaired area well enough.