EMAFALKORLS1

Hello ls1tech, my name is Emanuel I'm from BS. AS Argentina and I hope you can help me. My English is very bad.

In my country there are very few American cars and I have the pleasure of having a Corvette 1998 Gen3 Block of Aluminum 345ci. 6 bolt.. correct

The problem is that after 120,000 milles, spun bearing ..

My idea is to assemble it naturally aspirated, in these measures
4.000 x 6.125 x 3.905 .. This is possible ?????.....

I know that the casting of my engine is not good but here there is no possibility of getting an IRON block,

Another doubt that I have is that if there is a main cap girdles and billet main caps , so that the stroke lasts, it is something that was spinning in my head ..

I hope you can help me, thank you very much.

EMAFALKORLS1

Hi....

G Atsma

Your engine cannot be bored. Cylinders too thin. Your main caps are held with 6 bolts, not 2

pantera_efi

iTrader: (1)

Hi Emanuel, sure I can help.
Fangio and his brother Tito were my friends as is the Gaffoglio Family.
THE BEST VALVES in the WORLD are made by the Bosa Brothers in your country.

I CAN SUPPLY your 3.905" Bore x 4.00" Forged Crankshaft, FORGED RODS, Forged Pistons, rings, bearings, balanced.
Your stock GEN-III caps should be fine with the 4" crankshaft.

You will require a new Oil Pump & Timing Set ?

Would you like my help ?

Lance

EMAFALKORLS1

Hi G Atsma, thanks for the prompt response. You're right, it's 6 bolt, I misunderstood my mechanic. I still do not have the size of the Sleeve stock, but for the accounts I take out I would only have to enlarge the cylinder in 0.007 inches, 0.0035 per side .. 3,898 to 3,905. so problematic is this? With respect to the stroke someone made it in a gen 3 alu, because I can not find information about this work anywhere, Again, thanks for the response.

garygnu

before you buy any thing ,have you block checked out .a spun bearing mite require a honing or boring the main caps .do you have a good engine machine shop locally ?or consider buying a complete ls stroker short block .

EMAFALKORLS1

Hello, garygnu! Spun rod bearing, I consider buying forjed rotating assembly and cams kit .. but I want to confirm that the stroke is possible and enlarge the cylinder as well.

G Atsma

You CANNOT bore the LS1 cylinder more than .005" as the walls are too thin. They are NOT made for boring.

KCS

iTrader: (20)

Welcome! I spent several months in Argentina last summer, mostly in Campana and Buenos Aires. Your Corvette must be a very rare sight!

The 3.905" bore and 4" stroke combination is very common. The increase in stroke will pull the pistons further down the cylinder, so pay close attention to the bottom of the cylinder and make sure that it does not have any sharp edges. As the piston reaches the bottom of the cylinder, some of the piston skirt will protrude below the cylinder, which is not a problem. However, if the bottom of the cylinder is sharp, it will cut into the piston skirt as it moves back up into the cylinder.

There is no need for billet main caps or main cap girdles. The factory components are very strong and will be adequate.

LS1MCSS

iTrader: (18)

For years it was said that you can home the LS1 any more than .010 and a lot of people did that. Recently people have started saying you can't go more than .007. What has suddenly changed on the blocks that have been in service for years?

G Atsma

Too many break-thrus, I would assume.

KCS

iTrader: (20)

I don't think a difference of .001-.002" of wall thickness matters much. Up to 3.905" bore diameter should be fine, but if it needs to go bigger then sonic checking of the remaining sleeve thickness should probably be required.