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Whats the limit of a wet shortblock?

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perrytheplatypus157

Proven Member
81
44
Jun 18, 2017
Fall River, Wisconsin
Just curious, who here has a high horsepower fully wet block? and what do you make (hp and dyno type) or trap? Looking for personal experiences please. And for those who have half fills and street drive their vehicles, how do you like it? Do you notice any overly excessive heat anywhere? I've seen posts like this that are older but I'd like to revisit the topic to see if the advancements in technology have allowed us to stretch the capabilities of our beloved cast blocks
 
It literally depends on a million things. I think somewhere around 800whp you can have problems. Certain piston designs seem to always appear in engines that split cylinder walls. Half fills don't seem to help anything, and they just crack above the fill. Think about where a flag pole breaks off at.......

I had a motor not only crack a cylinder wall, but break a business card size piece out at 700-750whp. It was a fresh motor with like 10 passes on it. It was 0.040" over though, and it was making some steam, 144mph traps at almost 3300lbs back then. I was also using some oddball pistons - Probe. They have offset pins, and small skirts, just like the pistons that I see in broken blocks all the time.

I'm slightly worried I'm getting into the danger zone on my current setup - 145 traps at 3000lbs. It's only 0.020" over and I have good pistons, so I'm not especially worried. But I'm pretty short on time and money these days so I'm kind of avoiding turning mine up any further.

If I was trying to go as far as possible powerwise on a wet block, I would not do any kind of fill. I would find a block that can be used at standard bore or close to it, and then get custom pistons - shooting for as little of overbore as possible. like 0.002" or so, max of 0.010 over. Cylinder walls are around 0.180" thick, so 0.010" is more than 5% of the wall thickness gone. I'd also search out a good virgin non performance used head. 1 light decking and use a felpro composite gasket, and standard ARP's at like 105 ft*lbs. Work my tune to keep that gasket happy. I strongly believe if you can't keep that gasket happy you are making dangerous levels of cylinder pressure. This is pretty much the current path i'm on (at 0.020" over though) and the car runs 9's and isn't broke all the time.
 
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Hello Sorry for the late reply, but that is completely idiotic information from bastard, his car runs once a year at most and completely falls apart every outing he is not an example to go by.

There is multiple 1000-1150whp wetblock 4gs, i personally made 1006awhp thru an auto on a wet block and the car is still running. Having a experienced quality tuner makes A HUGE difference and bastard isn't one. I would also not run a cometic head gasket and standard ARPs if you floor your car more than 3 times a year like he does plus you make much more power.

Also full fill or no fill, that 1/2 fill seems to cause more problems than good.
 
Cylinder walls can crack around 800 whp, it's not if, but when.

1/2 fills still crack the block where the wall isn't supported by the cement, but you can drive them on the street. I wouldn't half fill a block personally, you have different expansion rates of the cylinder walls because half can move and the other half can't.

Cylinder pressure is the issue, those 10.5 compression motors are not good ideas.
 
Hello Sorry for the late reply, but that is completely idiotic information from bastard, his car runs once a year at most and completely falls apart every outing he is not an example to go by. There is multiple 1000-1150whp wetblock 4gs, i personally made 1006awhp thru an auto on a wet block and the car is still running. Having a experienced quality tuner makes A HUGE difference and bastard isn't one. I would also not run a cometic head gasket and standard ARPs if you floor your car more than 3 times a year like he does plus you make much more power.

Also full fill or no fill, that 1/2 fill seems to cause more problems than good.
Vinny out of nowhere with some bs. IDK what i did to hurt your feels, but it must have been a good one to follow someone around a dredge up shit from 2 years ago. Why don't you bring that hotrod of yours up here and we will hot lap em till the break. See who's lasts longer.
 
Vinny out of nowhere with some bs. IDK what i did to hurt your feels, but it must have been a good one to follow someone around a dredge up shit from 2 years ago. Why don't you bring that hotrod of yours up here and we will hot lap em till the break. See who's lasts longer.
Ya pal! im just trying to help the guy to not take advice from 2 people that have never been fast on what the limits are, one guy who traps 144 and thinks hes at the limit of the block LOL!! Im sure you might think that with your luck, i know your last Shootout outing the car did not run all year just to implode, fling the crank pulley and all in one pass. No one hurt me i was checking his post history as i was discussing the Xona with him.

I prefer results and information from proven people not some self absorbed guy that knows it all with a high 9 sec car that runs once a year. I hear those axle bars you make strip out too LOL!

Buddy IST above you is literally regurgitating a post he just saw by a shop saying the walls crack at 800 with a 63 LOL. I guess Jewer , these 1050-1200whp wetblock evos getting raced are a myth. My auto car made 1006awhp wetblock sold and is still running 2 years later in Oregon.
 
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