brrymnvette

Anybody know what the biggest bore and stroke you can get into a 6.0l iron block without sleeves?

kromberg

All block can be overbored to 4.03", but some blocks you can overbore to 4.06". A sonic test will let you know how far you can overbore. A crank with 4.125" stroke will require no extra work.

4.06 x = 4.125 = 427 CID :)

Keith

extremecorvette

Augostine Racing is getting a 436

kromberg

They are using a 4.25" stroke crank for that, but I have heard that it requires some serious work/grinding to clearance the crank.

Keith

MattG

Agostino Racing does not get 436ci from a 6.0L steel block. They are using their 4.100" Resleeved Aluminum block with a 4.125" stroke crank to get 436ci.

The most ARE will bore a 6.0L block is 4.030 and when matched with a 4.125" stroke crank gives 418ci I believe.

Chris@SD

They might not be, but we are. :smash: :smash: :smash: We should have results in the next few weeks depending on heads!




[Modified by Chris@SpeedDemon, 11:14 AM 6/18/2003]

MattG

What are you guys doing? Using a 4.250" crank? To me that sounds like too much stroke to go with the deck height of a LS1 block...

I remember a forum member had a custom 4.250" crank built a few years back and never had much luck with it.

What rod length would you use?? I am interested to see the results.

kromberg

What kind of clearance issue did you guys run into with the 4.25" crank?

Keith




[Modified by kromberg, 3:07 PM 6/17/2003]

Mopar Jimmy

:iagree: but just make sure if you go to a 4.060 overbore that you have that block sonic tested as many think .060 overbore is to much and you must make sure you have enuff cylinder wall thickness.

427cid in my honest opinion with 4.060 bore and 4.125 crank is as big as i would want to go with the 6 liter LQ4. That is exactly what MTI built me this past winter! I believe 4.250 would be wayyy to big o a stroke.


[Modified by MTI 427 Roadster, 3:25 PM 6/17/2003]

NEPTUNEBILL

I was talking to Shirl Dickey about the 4.250 stroke and the clearance issues were too much to overcome in his oppion. A lot of people will punch the iron block to 4.06 but it leaves little to work with after that, not saying it can't be done.

Chris@SD

Any particular reason as to why? What is the detriment to putting a longer stroke in a street car? Piston velocity will not become an issue at any kind of sane RPM.
Just curious...

Chris@SD

There is a good amount of clearancing to do.

As for how it will turn out, we will have to wait and see... :yesnod: :yesnod:

kromberg

Do you think the same clearancing would be needed on a 4.125" bore block?

Keith

2014stingrayjoe

i havre just assembled my 6.0 block bored 30 over withha lunati 4.125 crank, lunati billet 6.125 rods, and diamond pistons. no clearance problens except for piston clearnce on # 8 with the relucor wheel, but diamond has since fixed it, i used the ole dremel tool. the problem was i had a set of early design custon pistons, and they now clearance for all strokes, and theyare sweet looking pieces if you are in the market for pistons. other than some assembly new deals such as "dumbell", few plugs, and the alignment of front and rear covers for pan placement, pretty straight forward. should have it in in about 2 weeks.joe

redbob

Matt
I want to use the ARE block with 4.125 bore/stroke for 441ci with dierct port nitrous. Have you heard of any problems with this combo?

MattG

You can go 4.125" with the ARE resleeved block if you desire, but they don't usually recommend it. They have tested the 4.100" to over 1000hp with a very large TNT direct port nitrous shot and experienced no block failures.

MattG

Isn't there more to it than just Piston Velocity though? What about the force that is pushed against the cylinder wall because of the rod angle from the long stroke?

Regardless, I am interested to see how you make out with this engine as it is always great to grab some more cubes! :yesnod: