Hi all
I'm about to strip my 6.2 down and replace the heads with 6.5 heads and
install a 6.5 turbo set up.
It's an early 82 block red in colour, i've heard these blocks are stronger than the later blocks? The thing is i have come across a set of 6.5 pistons and rods for not much money, would i be ok having the block bored out to 6.5 and fitting these pistons? what problems would there be? I will be getting the cranck polished and fitting new bearings and a new oil pump while the engine is stripped down.
Thanks in advance.
Phil

I'm sure boring to 6.5 specs can be done or you can use the next possible oversize piston for the 6.2 such as .30MM or .75MM and so forth.The 82' block was supposedly the best of the bunch because of its high nickel content.1993 6.2 diesel blocks are also quite good from what I hear.

Since your going through your engine,a new timing chain set would also be a good idea.You should have the rods checked for straightness,have a look at the rod bushings and have new rod bolts installed as well.If new rod bolts are being installed,the big end will need to be resized because of any distortion that could take place when installing new bolts.

Some guys don't use new rod bolts,but for peace of mind and to protect your investment i'd highly recommend new rod bolts to keep things intact.

Hi. It's the price of the parts over here in the uk thats the problem again. My mate has some 6.5 pistons and rods that have only done 4000 miles from new and i can get them pretty cheap. Thats wwhy i was asking about using the 6.5 pistons. The cylinders have a bit of wear plus one of my pston tops has been damaged some time in the past, looks like a small metal object had got in the cylinder. have already put a new timing chain in there and new IP drive gears. Would I have to get the crank polished before i could put new bearings in there with it being niterided or can i just put new bearings straight in there?

I'd have the crank journals checked carefully by your machine shop because a journal could be slightly tapered or out of round.If it passes the test and does'nt need to be reground,a polishing of the journals would be a good idea if they are dull.Also be careful when removing the bearings.Some cranks could have different sized bearings on one or more journals.That has been known to happen in some cases.Keep the old bearings in order and you'll be good to go when you install the new bearings.