225 rebuild

I'm in the process of rebuilding my 1970 CJ-5. The original 225 V-6 block was cracked. Just picked up a 1967 225 block. I'm salvaging the best of both units. Crank was polished, new pistons, reconditioned rods, etc.

My question: When I ordered the pistons, the guy told me "you have a 225 odd-fire V-6, you had better get the crank, pistons and rods balanced or you are asking for trouble."

What's the scoop? I don't intend doing any "hole-shots" at the drag strip, just some weekend off-roading.

Thanks!

 

and his brother owns a machine shop

not neccesary
its your choice
in my opinion

edit: welcome, go to introductions and tell us about yourself and your Jeep; oh, and they all want pics R)

 

as long as it stay under 5000 rpm you should have no trouble..


BUBBA

 

Somebody is smoking something that isnt authorized..

 

Brannon, who do I need to talk to for that particular authorization??????

No help here but . . .Welcome!

 

Not sure Brad, but it has to be easy to get as half of the people I meet are doing it....at least they act like it according to the accuracy of the info they give out!

 

I agree. Ballance an Odd Fire? Yea right!

BUT, I would not rebuild an engine without getting it ballanced. The 'Ol Hot Rod in me I guess. It DOES make a difference.

 

I'm with the ol' hot rodder on this. Are you asking for trouble not doing it? No. Would I do if I were building the motor? Yep.

 

The bad problem with balancing this motor is that the original balance was set at roughly 34 1/2% and most engine builders balance at 50%, that is a huge amount of material to remove from the rotating assembly or a huge amount of expensive mallory metal to add to the crank. I thought long and hard about it and decided that for a basically a normal trail rig that doesn't run the motor at 5000 + rpm that it just wasn't worth the $300 that it was gonna cost. Remember factory motors are only balanced half assdly, thats so they can mix all the parts up on a table (so to speak) and build a dozen motors and the balance will be relatively close (probably +/- 5%), by no means good or perfect!!

 

Mike: You might be right on this. Remember our OF 225's redline at 4500 rpm. I've never built a OF 225, just SBC's that see over 7K rpm. My old "Hot Rod Sence" says to do it, but in reality it doesn't seem to make any real diference for our 4500 rpm engines.

I guess the bottom line is--it's up to you.