I'm about to spray my H/C car, and was just wondering how much rwhp the stock bottom end can handle, assuming its in good shape.

 

somewhere around 500 hp at the crank...should come
around 440 rwhp

 

Well I'm going to be shooting for 500rwhp on spray, so I guess I'll see how it holds up.

 

how much spray??? You should get forged pistons atleast

 

100-125 shot, nothin too big.

 

I think you'll be fine with a 100-125 shot. I've been using a 150-175 shot for a few years now without issues. Stock 77k mile LT1 shortblock. I know I'm pushing over 500RWH+ on the dope. Just make sure your fuel system is capable.

 

If it is a factory bottom end ya won't last long at 500RWHP.
It would have to be built to take 500FWHP N/A and live.
Guys run a hundred shot all the time but that doesn't equal 500RWHP with a stock engine.

 

i'd think it'd be alright if it's a head/cam and nitrous car, cuz just with the heads/cam and all the other stuff you'll prolly be around a good 400 RWHP so then u'd just be spraying a little 100-125 shot to bump that around 500RWHP. You don't really hear about too many people breaking rods or the crank on these LT1s even with a lot of power.

 

how much would it be able to hold w/ just forged pistons??

 

I have a Walbro 255 coming on tomarrow.

 

It depends, but with stock bottom end I wouldn't spray more than 150

 

hit it with a 200 shot

 

What are you reving too on spray? I'm going to set my window switch to 3500/6300

 

There are really too many variables to answer a question like that accurately.....forged pistons alone won't help at all "if" a wristpin or a rod bends, or any number of other common things go wrong.......the big thing with nitrous as it applies to the power levels were talking about here(about 400RWHP NA and another 100RWHP worth of nitrous), is that you never let it go lean....I've seen a 75 shot blow a hole right thru a high dollar forged piston more than a couple times over the years when it went lean, so it's not always the size shot that does it.........I'm currently at we'll over 500 RWHP and over 600 RW Foot LB's of torque with a 4 bolt main stock bottom end and having no problems(maybe that has helped a bit)......In my opinion Im probably right around the "somewhat" safe limit of the stock bottom end.......In some peoples views I've talked to, Im "way" past the safe limit, but the fact remains that I've got another 8 months worth of abuse on it with the current mods in my sig on top of the previous years and years worth.....I just performed a cylinder leakdown test last weekend, and a full cranking compression test (4 rev's for each cylinder) and everything is as even as can be, so obviously the power hasn't cause any verifiable damage yet.......but if it blew tomorrow It wouldn't shock me

 

I ran a stock crank, stock rods, forged 11:1 speed pro pistons with new clevite bearings and a new oil pump a basically stock bottom end with 403rwhp all motor and a 250 shot for almost 2 years then I sold the car.