Just wanted to see if anyone has made over 700rwhp on there stock unsleeved block. Or if anyone has cracked there block making more than 600rwhp.

 

MRC has hit 673whp/500+wtq so far without sleeves and Headgames heads at only 12psi!

 

I'm unsleeved and loving it....

 

im going to be unsleeved too, but then again i got 3 weeks left till the install date so no numbers yet

 

MrA is unsleeved and I think he is at something like 760rwhp 800+trq. Not 100% sure of the numbers but they are around there.

 

Those are awesome numbers for unsleeved motors, props to the pioneers!
I wonder how they will hold up though..

 

How the unsleeved blocks hold up is my concern. I am getting ready for a rebuild and i am figting weither or not I need to get a sleeved block or I just want a sleeved block. I am looking for, when all said and done atleast 550 to 600. So are the needed that is my only question?

 

Yeah all the high numbers people are getting on unsleeved blocks are just 1 or 2 dyno runs. Only time will tell.

 

While meatbag brings up a valid point that some of these people are only making one or two dyno runs, I know that bigbri, for example, runs his car hard on the street quite often and has a few times at the track and he has been doing fine. From what I know, quite often the street will put more load on the engine then a dyno will.

 

yeah but is bigbri running the 700+ tune on the street all the time?

 

I am not quite sure about this but the turbo kit could also have a determining factor in how well the engine holds up as boost may come in different on one turbo kit compared to another and put slightly more load on the engine.

The only other thing which I would like to point out is that BigBri also revs his engine to 8000rpms if I am not mistaken which is far hard on the engine then the compressive force of boost.

 

Im gonna say this straight up, sleeves are very hard to do, from what i have seen chances of head lift increases, a sleeve can drop and its a 1000 bucks for somthing you dont need. They are over rated on on the vq.

 

VRT made over 700whp on a non-sleeved block. Of course, that was a dyno and not a daily power level, but still....

600whp seems to be safe on stock sleeves.

 

If your gonna build a alum. block for 600+ you have to sleeve it. I dont care, this is what i learned from having a turbo honda and 6 engines. People are just being cheap about there build, if your gonna stay with under 500, you can get away with no sleeve's, but only time will tell....

 

Yep.

 

Is it an increase in psi or whp that increases the chance of headlift?

 

Then what have you done to keep the heads down or blowing coolant?

 

I'm going to guess very little timing and lots of water injection. I mean how else could he do it?

 

personally, if i had the money to build a 700+ monster i would spend the extra dough and sleeve that bad boy

youre basically having the rebuild the block with new heads, cams, pistons, rods, crank, valve train etc anyways?

 

IMO opinion both...remember all the 600-500-400 HP club like last year, most of the 500 and 600+ plus cars had to pull there built motors, and i believe most of them got sleeves this time and better headstuds