I have a basic question. I have used pistons that I have cleaned up and look good. I also, have new pistons with pistons rings. Should I just Hone out my cylinder, place new rings on the existing pistons and be done with it?

Or should I get a Plumbers Torch and light up the connecting rods and replace them with the new pistons?

thxs

 

might as well use the new ones

 

What are you doing with this motor?
I've seem many posts from you like this cam look worn, are flat tappet bearing the saem as roller?, How do I press the rods onto the wrist pins, and now should I reuse old pistons?
So you have new pistons, what size did you get? Have you measured your bore? Have you inspected it for a lip at the top?
Does it need to be bored out or just honed. If it needs a bore....how much, and did you purchase the matching pistons?
I think you are out of your depth on this one and suggest you pack it all up, put it in a box and take it to and engine shop.
No offence intended, its greeat that you are giving it a go, but a forum can'tdo it all.

 

lol. Thanks for your concern. I do use the forum to ask alot of questions. And I do have my father and a friend who has more exprience rebuilding engines than I do. As for the above. The pistons of new and existing are STD 4.0. One of them, said if the pistons do not look that bad, just reuse the pistons and replace the rings. (Makes sense to me, but I want to ask to be safe).
Also, since the engine had new parts that were worn alittle. The one I orginally have which is a (68) the cam and lifters where new, and so were the heads (cleaned and rebuilt). So I am just using the block and all (68) parts back in b/c of (My Budget). I know its a said story.
As for the engine for the car, it will be a once a week daily type driver.

I hope that filled you in! Thanks for your help as well.

 

I will continue with the point that fast66 was making. INSPECT & MEASURE!

You need to measure your bores, go to the manual and see if they are within spec. Don't just meaure in one place. You need to measure in several areas such that you can determine tapered or egg shaped bores.

If the bores are within spec, then inspect and measure your pistons. The outside diameter of them will probably be okay, but you need to use a new ring and a feeler gauge to see if the ring lands are excessively worn.

If after proper inspection and measuring you find the old pistons and bores to be reusable, you would probably be better off using them than using a set of new pistons which have not been fitted to the bores.