2G High Mileage 6bolt motor, worth buying for rebuild?

[Kai Hefner]

I have the opportunity to pick up a 6-bolt longblock for a good price. I'm looking to step up my game and possibly do a 7-bolt head/6 bolt bottom end swap, but I'm wondering if the hile mileage on the 6-bolt is going to affect anything.
I'll likely be replacing the crank/rods, etc for around a 500whp goal, but will the over 200,000km on the 6-bolt come with any block integrity issues or something along those lines?
Thanks in advance.

 

[DSMPT]

Almost all 4g63 already have high mileage. Since the block is cast iron, it is strong. But recommend to sonic test it while rebuilding.

 

[motomattx]

Its actually going to be a better block, its well seasoned and should hold its shape well.

 

[Kai Hefner]

Its actually going to be a better block, its well seasoned and should hold its shape well.

Is this serious? I feel like that exactly the opposite of how material stress affects structure.

 

[zedicus]

he is serious.
there are race teams that pitch iron blocks out in the elements for years and then use them in their race cars.
bore that thing out 1 size and run it. (if you are having pistons made a bore might not even be necessary)

 

[1990TSIAWDTALON]

I tore down my 180K mile block and it is still within spec and going back together with the stock crank and std pistons. We are actually doing 2 at the same time and both blocks were hi mileage and they are both staying std. Maybe we are just lucky but they didn't even have any ring ridge!

 

[sep596]

Still running a standard 6 bolt, it had 100k when i put it in my car and was within spec and im sure it still is