If I run a healthy 355 small block with Vortec heads= approx. 375-425 horsepower, what's gonna happen if I get Hyperuectic pistons and not forged and run a shot of nitrous between 75-125 horse?? I know you guys are gonna say to just spend the extra 150 bucks or so, but it's not that easy. I had to sell a car just to build this bottom end I'm workin' on!!!

 

Just my opinion here...75-125 shot on hypers is fine as long as you don't get carried away with compression ratio to help avoid detonation.You will be skating on the line of hurting them if you run closer to a 150 shot but I have seen it done many times..but it will blow eventually on juice.So here is my advice...take your time and save the extra dollars to buy forged pistons.So what if it is a few months longer to save the added $150 or so to get the motor together..unless you need it is as daily ride that changes things.If you are planning to spray you will be better off saving for the forged pistons.I started my current 355 5 years ago as a forged piston motor..3 years saving and buying later and I finally had a fully 4340 forged bottom end...AFR's..the list goes on cause I knew after awhile I would want MORE!.Build the strongest short block you can and no need to worry about it down the road.After talking to many people about juice motors I decided to hold off and keep saving and build a forged bottom end so I can spray and not worry about it and am glad I did.IMO..you start at a 100 shot but a few months go by and that 100 shot is not enough anymore so here comes 150..then 200..then..ah you know how that goes.Build it strong..build it once JMHO.Save for the forged!

 

I've gone a dual stage 250 shot on hyperpathetics. It can be done. Just make sure your fuel is ok, and you'll be fine at 150.

What CR are you running?

My current setup is a single stage 150 wet shot, on hyper's. Not a problem with it.. I can't count the # of bottles I've used. The dual stage setup was a first wet 100, second wet progressive 150.


If you're really worried about breaking something.. Put some thought into the Jacob's Mastermind. It will allow progressive use. It does require an aftermarket ignition box. (I reccomend the 6AL of course)

 

hey if stock cast piston motors can run for years and years on 150 how come a hyperuetectic couldnt. like I say, "go for it, its only metal...."

 

Yes, for the few extra bucks forged is worth it, i think we will all agree on that. but my 305 with stock cast pistons and 220,000 miles took a 120 shot on numerous occasions. still purring.

 

I posted a similar question on this board a few months ago,And i also called the tech line for the company that makes my pistons,And i was told by them that hypers will be fine as long as your careful with your timeing,i also found out that there are quite a few people on this board that know hyper pistons will be o.k. as long as you do it right.

 

The hyper piston will be fine as long as the tune is correct. Make sure you back the timing down when your going to spary and make sure you have good fuel in the tank. You might also want to up the fuel pressure and change to a set of colder plugs. I have sparyed 250+ on a stock 1995 mustang engine with came with hyper piston and I am sure the aftermarket piston are stronger then the ford factory pistons.

 

Yeah I know, nothing against you, but KB is soooo full of themselves; "we have a 1,000 hp dyno motor with a 1,000,000 hp of nitrous on it.... blah blah blah" Im sure you can pump massive amounts of nitrous into any engine until it reaches its "actual" breaking point under laboratory like conditions. as far as running some nitrous on hypers, as long as the ring gap is high and the amount is not excessive, the fuel is supplied good and the timing isnt too high, no prob.

 

Hyper's are very strong, you can stand a mountain on them and they won't break under the weight. But the minute you ring them with the frequency that nitrous causes when it detonates
they will shatter like glass. They break, they don't melt.

 

I use hypers and 125 hp shot of nitrous with no problem. I am using vortec heads just like you plan to do. My car has gone a 7.78 in the 1/8 mile.

 

I always thought how strange it was how some guys with 220,000 miles can do this kind of stuff, and some guy can go and power adder a newer car/motor and it blows right up. Its a zen thing I think.