The last two pix are exactly what you'd want on an iron block or steel sleeved engine, a nice light crosshatching pattern.

 

Needs to be polished then silicon treated according to the books.

 

Mark,
Based on the look, and the relation to the "scratch", it actually looks "ok". Dinan did htis to the old 850 as recommended by the "flex hone" folks .... forget the company name.

The dull sheen of the Si is still present and it is "unlikely" that any metal to metal contact will occur.

Would I use this block ...No ... i would run the pistons up and down, turn the crank by hand or with a "big drill" with some auto trans fluid and see if the surface improves.

Marc

 

Thanks Marc,

I really appreciate the input here on this one. (and so does scot, but he doesnt know it yet.)

Mark

 

Bore it to make a 5.0 liter!

 

Hi, I stumbled across your forum and found this thread so I've just joined so as to comment here if that's ok. The blocks are alusil throughout so the silicone is impregnated throughout the aluminium. Once you have roughed up etc with the various stones you use felt pads coated with silicone paste . The hard silicone in the paste rips out aluminium from around the silicon granules in the block thus leaving the silicon proud of the aluminium. The piston/rings will ride on the silicone. When this has been done properly the bore has a matt grey appearance and feels smooth as glass. It's possible to save blocks that have only light scuffing this way and still remain within porsche tolerences. HTH. Mike. Oh, it's a messy process but I've saved a few blocks this way!

 

What were you searching for that popped up this thread?

 

Don't pay attention to Hacker. His gay lover just left him and he's looking for a new stud.

 

I said I was sorry, what more do you want from me?????

 

Please, guys, could you keep your spat in "Alternative lifestyles?"

 

No way, I'm not going anywhere near the 997 forum.

 

The new ls7 race engine's reputed to be non linered (unlike the road variants). I was trying to find any information suggesting it may be an alusil block given that it's known to be aluminium. By going unlined they'll have more strength between the bores. Searches brought me here

 

I talked to my friend who has this kind of info

"The LS7R that the GT1 car used was sleeved, and now that they are in GT2 all
they did was de-stroke the motor (from 7 liters to 6), same block less
cubes."

No info that he can share on next years all new 5.5 liter.

 

Thanks for that. Originally I'd been looking here:

http://www.corvetteracing.com/cars/c...ne_specs.shtml

I've been reading about the possibility of the 5.5 litre on the same forum.

 

I love those LS blocks. They are so tiny with so many cubes.