Originally Posted by
bigmatt
Well I am going to find out if mine lasts. since I just put in new wrist pin con rod c clips. My 5 port is a gen 4 because of the crank. It has a circle cut in the end on it. MOstly you can tell by the heads. The first ones said go and 21. then they came with pretty engraving on it. and they changed the carb. I am sure grizz, 22racer[anyone heard from him lately?] or mark from massive mods can give out the info. Also there are a lot of variables here. 1; how are the bearings? are they a little loose causing vibration? are you putting the new conrod in facing the right direction? whats the shim pack? and are you running to lean on the hsn? how many gallons through the engine? and last but not least is the crank pin worn? I think a while back it was 22 racer or grizz that mentioned some thing about that problem.
Forgot to answer the questions.. The rear bearing is a TKO Ceramic with almost 2 gal on it. The front bearing was replaced with P/S/R set. The Rod was pre-assembled and it was the correct way. The motor had less than a gallon on it each time the clips popped or broke. The pin is good. I have had them wear before and had them reground and the rod re-bushed on other motors. Shims were installed by RB. I didn't get a chance to really lean it out either time. Was tuned about 90% when it died.