Do the 6L iron block can be bored to use 6.2L pistons? Safe?

 

I wouldn’t throw boost at a 4.065” iron block, but na should be fine. Lots of guys have done this for a poor man’s ls3 with oem pistons

 

I have a 6.ol iron block that probably will need to be bored and have an offer for a 6.2l pistons/rods set. Can i bore it to that size so can use the 6.2 pistons? Its safe?

 

The post between both of the ones quoted says you can.

 

I'd keep the extra margin in the block for possible future use if needed and plus a set of hypereutectic pistons run under 300.00 bucks new.
https://www.summitracing.com/parts/slp-h1129cpa75mm
But ultimately its your build and your say.

 

I'd go with 4.030 bore and gain your cubes with stroke but that's me.

 

^This you can bore it over, put a stroker together, and still have enough meat left on the cylinder walls that if you want to go FI you are able to.

 

i vote 4.030 and use a summit forged piston/rod kit with stock crank for a forged 370. use all arp head and main hardware and it should handle any thing you can throw at it...

 

That's what my thinking was with the LQ9 build.

 

Hello, I have read quite a few threads where the poster asked if it was safe to bore the 4.8/5.3l blocks to the ls1/6 bore and the general consensus is to have the block sonic checked first . Ls1 bore is 3.898" minus 4.8/5.3 bore of 3.779" so thats .119"coming off the smaller bore blocks and I have'nt read where anyone had any trouble doing that. So I would imagine You could easily have a 6.0l (4.001") bore block taken to 4.065" safely . I suppose it all depends if You may boost it someday or not.

 

The reason for this is there's still plenty of cylinder wall left around the cooling jackets on a 5.3 block when bored to 3.898, hell they've even been to 3.905 bore. Not so much the case with the 6.0 blocks that already comes with a 4.00 inch bore and you're looking to go with power adders. You could use power adders on a 6.0 bored .060 over but now you're filling the water jackets with blockcrete and when it goes you'll have yourself a nice table stand.

 

Most are just regurgitating what they have read others write on here, 0.060" a very conservative and outdated safe margin imo, they only said that when the engines were brand new and not proven performers

Maybe there's someone unicorns who will chime in who's broken a 6.0 from boring it too far, or maybe somewhere in a faraway land there's a machine shop with a pile of 6.0 blocks in the corner that failed a sonic check who knows but It's just no one of those things people seem to think will happen if 0.060" over is fine, what's another 0.005" really going to do besides free up a whole heck of a lot of cheaper piston options, In fact I read on here all the time and I've never read of anyone having a cylinder on one of these come apart for it being too thin.

It's not going to be a "poor Man's LS3" It's going to be an iron 376 cubic inch torque pig of Doom

Correct me if I'm wrong, Tell me I'm riding the razor's edge every time I turn the key, but fear is the most powerful weapon and it's in this hobby just like everywhere else only here it robs you of horsepower and money. It's just like people today are still scared of compression because old ignition systems were crap and they still think the LS engine needs just as much careful machine work for a simple rebuild as an old SBC because there's no way manufacturing tolerances could be any better now than they were in the '60s 🙄

So yes you can totally punch out a 6.0 for 6.2 pistons. Mine has over 35,xxx miles of abuse on it, 4+ years of auto-x abuse (7200 RPM all day long every weekend. It gets daily several times a week and it always gets its *** kicked when I drive it.

My bill at the machine shop was just $300, All I paid for was the overbore, no Sonic check no nothing, they didn't even ask if I wanted one because they bore them that far all the time. 4.085" over is more common than you think, there's a reason most of the shelf gaskets are 4.100"

 

You speak as if you've built and then sprayed or boosted them without issue. Hey bud can you throw 50lbs of boost at .065 over iron block with a 200 shot on top of it? Well the answer is yes you can do it at least once.