As the title suggest, can i reuse them if their still in one piece on the iron? Just like slap the thing together or should i put in new ones? Their not broken or anything

 

If they're old... no. Not worth it.

If you just re-pulled the engine apart because you screwed it u when you put it together... sure.

 

Never re use old wearable parts like o-rings , the exception like previously stated is if they are like new and you are fixing a mistake in your rebuild.

Old o-rings will fail and you'all be wishing you spent the money to get new ones.

I've seen many people have problems with RA coolant seals getting pinched , OEM are much better , then there are pineapple racing heavy duty coolant seals which I've heard good things about , suppose to be stronger than OEM.

 

I only took off the rear iron, should i replace just those or all of them?

 

Unless you managed to clamp the rest of the "stack" (everything forward of the rear iron) together, and there are threads explaining this, you must now replace them all if they're old.

If you haven't already removed the rear iron, find the thread and read it... otherwise, go ahead and order a new set of coolant seals.

 

I would only use NEW. Your asking for early failure.

 

Your post is almost pointless. If your engine failed due to a cracked rear iron, its perfectly fine to do as I stated iny previous post. He stated he is only pulling/has pulled the rear iron... The answer is already in this thread.

 

Think of it this way. Is the cost of new o-rings worth risking pulling the engine to replace them after the old ones fail? Is your time worth anything? Theyre not much money just change them. I use OEM ones...but I wanna try the Pineapple heavy duty ones in my next build.