I was wondering what the disadvantages of running a 6.0 iron block as opposed to the aluminum 5.7. I know there is a weight increase, but what about part issues. Do the blocks have the same main diameters ect. Will all of the LS1 part interchange with the iron block? What is the biggest bore that can be accomplished and still be streetable,and reliable?

 

Yes, all parts interchange and have the same size of mains, etc. There's a few bolt holes missing for accessories but thats about it. Largest bores size is 4.060 but I'd suggest a sonic test first.

 

I'm about to go this route myself, if everything works out.

I'm going new 6.0L block and keep the stock 4.00 bore. Using a 6.0L crank, Diamond pistons, Manley rods, a custom ground cam w/ matching springs, and topping it off with my current LS6 heads (no money left for porting).

I hope it is gonna work well and make some good power. I really don't know what to expect. I guess a lot of it depends on the cam.

I figured why bore it now if I don't need to - I'll save that for the day I tear it apart and build a stroker out of it

Let us know how your decision goes!

 

I agree with RODENT 100% as i ran a 427 iron motor before my C5R motor and did a ton of research. If your staying N/A 4.060=max bore but MUST SONIC TEST to make sure you have enuff meat, as many of the new iron blocks are to thin for 4.060. Matched with a 4.00 crank you have 414 cid. DON"T RUN more than a 4.00 crank or your LOOKING for HUGE reluctor wheel problems and oil consumption with a 4.125 crank on a ironblock.

If your spraying or planning GAS or other F/I then stick stick with 4.030 bore and that matched with a 4.00 crank gives you 409 cid and leaves room for rebuild if ever needed. IRONBLOCKS a GREAT way to go if you want extra strength don't mine 100 lbs in front and if you stay anywhere from stock crank to 4.00. Throw in the new eagle crank (4.00) and build yourself a kick azz iron superstroker!

 

Everything swaps over just fine. You do however have to tap a hole for the alternator bracket.

 

Sooooo. the 4.125 need to build a 427 is outta the question?. Point me in the right direction guys... I have an aluminum block that I can resleeve...or i can pick up an iron block for less than it would cost for the machine work on the 5.7, have it machined and still save some $$$. Any way going I want to build a kick @$$ stroker thats capable of 500+. i am going t o start the build in Jan...so I am running out of planning time

 

No way you can bore an iron block to 4.125". You'll hit the other cylinders by then.

A 408/409 would be the ultimate reliable superstroker setup.

 

If you want to go with a 427 i would go with one of the new kick *** alum. block darton set ups warrantied by folks like MTI, LPE and many others. If you want to save some dough and 409 cubes sounds good go with the iron bored 4.030 over with a 4.00 lunati crank and your good to go N/A and with MEGA N20 if thats your thing. Just remember to get the best heads that you can afford matched with a kick *** aggessive cam! Also, if you go iron or even alum. for that matter i WOULD NOT use a stroke over 4.00 as i had a CALLIES 4.125 crank that failed on me with an ironblock bored .060 over and was told ultimately the geometry of the motor was off with that BIG STROKE!!!

 

Good thread, with good info.

So, to be on the safe side, only bore it to 4.030 and then when the time comes to do a rebuild, have it bored to 4.040 for the service bore?

I plan on getting my 6.0L block tested very soon, so hopefully I'll have a good block to make the bore bigger...

Bill

 

All good advice! I may be selling my recent 364 (stock bore) 6.0L engine if the car does not sell.

 

Hey Levi.. would my cam work with a 408? Ya know...the MTI one

 

Yeah, it'd work

 

Rob, I have been trying to tell you this is the way to go for your budget and goals. Don't worry about the extra weight up front we can help ya get that all worked out.

 

DemonSS is 100% correct that ths is the way to go. Just buy the BEST HEADS you can afford. These, IMO, will make or break your engine's power output.

 

How do you think my stock bore 6.0L project is gonna do with stock LS6 heads and a decent cam? I can't afford to port the heads. Will they do alright?

I was looking for around 400 rwhp - is that wishful thinking?

 

I have stock bore 6.0L with Absolute 5.3L heads. Car dynoed 400/438 through a th400 tranny, steel DS, 12-bolt, and with slicks on. Traps consistently about 121, so that is more indicative of about 440rwhp based on my weight.

 

If you are debating about staying all aluminum I would hold off until someone gets their hands on an LS2 block. I have heard it will be compatible with LS1 internals.

I hooping this becomes the cheap option for going all aluminum big bore.

 

Unless the LS2 block comes in different flavors other than the 6.0L block you will still need to re-sleeve the block for things bigger than 380's I think. You might be able to squeeze a 390 something out of it depending on what the bore is going to be.

 

Let's hope they just start mass producing the C5R block

 

This maybe a dumb question but I thought I read somewhere in another post that for the geometry to be correct you needed to have the bore bigger than the stroke.

Is this correct?

What is the stock bore and stroke on 6.0L block?

I like the idea that BLK02WS6 has with stock 6.0L block and 4" crank