piston size ok with out boring?

[one eyed willy]

got my pistons today.

stock bore on the block is 3.544 to 3.548

pistons are 3.516 JE 3v

rings are file to fit 3.552 diamond rings

i talked to chris at BBR and he said i may need boring and he wanted me to measure everything,i sent him a email with the measurements and waiting to hear back now.what do you think?

 

[silverstang07]

It all depends on the condition of your block when you go to do the swap. That is what will tell you if you need boring. Needs to be looked at by a machine shop really.

 

[one eyed willy]

block has less than 12k miles on it,still has the factory crosshatching.block is in great shape.

 

[usafimj]

I would just have a shop clean it up. But thats just me.

 

[US-1]

You need to have a competent machinist check the bores. Period. No further discussion is needed. If you have excessive bore wear or taper then that block will need to be bored and new pistons will have to be purchased. Or you can buy a new block and see if the bores will accept your pistons.

Next question: why did you buy parts without consulting a machinist first?

 

[one eyed willy]

there was no previous problems with the pistons,block is pretty much like a new block. so there should not be a problem with the bore at all,only reason for replacing them is because i should with the block all torn apart. i got them for a good deal,im not sponsored so i had to get what i can get for a deal.im just trying to figure out what the rule of thumb is for piston vs bore?if i have to buy new pistons and sell these than i will, but im hoping these will be fine and was just looking for some input. i know a "competent machinest" will get the final call. there is no excessive bore wear or taper.

 

[ClassJ]

New pistons and rings ALWAYS means a trip to the machine shop in my book. Even if the bores are ok, a quick hone will help the new rings seat.

Better safe than sorry. I would even do this with a brand new block from ford with zero miles.

 

[kleistang]

u need to bore enough to take the glaze out of the walls and the it should clear after u messure

 

[SD07GT]

It has to be honed with torque plates period !

 

[don_w]

I would even do this with a brand new block from ford with zero miles.

+1...

 

[kleistang]

there was no previous problems with the pistons,block is pretty much like a new block. so there should not be a problem with the bore at all,only reason for replacing them is because i should with the block all torn apart. i got them for a good deal,im not sponsored so i had to get what i can get for a deal.im just trying to figure out what the rule of thumb is for piston vs bore?if i have to buy new pistons and sell these than i will, but im hoping these will be fine and was just looking for some input. i know a "competent machinest" will get the final call. there is no excessive bore wear or taper.

off topic man where did u get that hood man pm the specs please

on topic.

as i said before u need to slighly hone when its stock bore. use one of this tools which will not take a chunk of material but would get rid of the glase and make a perfect surface for pistons rings to sit right.

if u use one of this be carefull since it would take out a lot more material. make sure u messure everytime u use it. u could do this urself, there are some good videos on youtube that u could learn from. i did this in school a lot of times before building my motor. u can do it

 

[Freaknazty]

try putting this on it to help with the bore size

 

[joestang08123]

YUMMY!!!

 

[shawn13]

try putting this on it to help with the bore size

Thanks Freak, I showed the wife and now I have a BIG lump on my head (forehead)

 

[US-1]

try putting this on it to help with the bore size

Damn you Beau..........shit I'm glad I didn't see that post at work. Bastard.

 

[Freaknazty]

Damn you Beau..........shit I'm glad I didn't see that post at work. Bastard.

lol sorry forgot to put nws

 

[ClassJ]

Do yourself a favor.....if you can spare $150 bucks or so....don't dingleball hone the thing...as said above, torque plate hone it.

Bring the block and pistons to a good shop. You will have it back in a couple days for minimal cash with all the pistons numbered for their respective bores. AKA a fitted block.

If you are not doing this, I would change the rods and put the old piston back in their respective bores and call it a day.