Post by
C-Kwik »
https://forums.nicoclub.com/c-kwik-u426.html
Fri Jan 02, 2004 11:05 pm
I'm on my second one. Out of the box, the rev-hard is rather poor. Some porting helps quite a bit as the ports don't line up to the ports on the motor very well. I had bought my kit used, so when I got it, it was already cracked. I had it repaired, but it ended up cracking again. I didn't prep the first manifold for expansion as I was worried that it cooled down under stress. Either way it failed. My newer manifold, I prepped by cuttung the manifold to head flange so that each runner has it's own flange. I've had no problems since and I don't expect that there will be any in the future. The crank in my first manifold was right between the #2 and #3 runners through the collector portion. Based on the nature of the crack, it seems most liikely that the crack occurred as the manifold to head flange was not expanding as much as the rest of the manifold. Separating the flange should eliminate this problem.