Well like I said in the previous post about the 400 sbc my 383 is outta balance. Do to the fact that I cut corners when I put it together. The problem is the rods. I had the engine balanced, brought home the rotating assembly and put it together. Then to my dismay, I found that the cam was too big. So I tore it apart, pulled the rods, went to work on the grinding wheel and now it shakes like milkshake maker. If I buy a set of balanced rods, will I have to rebalance the entire rotating assembly or can I just drop in the rods and everything will be fine???

 

Well alot of people would be supprised at how much difference just a gram makes you would really be scared to grind anything after your done. Thats why its so important to pre assemble. If you get a matched set you may be o.k. but if your pulling it that far apart you may as well have it rebalanced. Good luck.

 

Yeah very true. Cutting corners and trying to save a buck is what got me in trouble last time. Might as well do it right this time.

 

There's more to balancing than just making all of the parts weigh the same.

THe crankshaft counterweights have to be matched to the weights of the other rotating parts. That's what's wrong with your current setup. The only way you could get it to work by doing what you're saying, is if you know how much rod weight your crank was set up for, and could buy rodds that match that weight. Which I'd say is a pretty low-probability prospect.

Do it right; that way, what happened last time, won't happen again. Sounds like you already know that's what you should do.

 

Can't you just bring in your current rotating assembly, to the machine shop, and get it rebalanced? Rather then buying new rods?

 

I was wondering how much you ground off the rods. If it is shaking as bad as you posted, maybe it is another issue.

Wrong flex plate, bad convertor, or maybe wrong damper for the application. Just a thought.

RBob.