[Brandn74]

Which block would be better for a 2-stage 550hp nitrous application 69 428(4-bolt) or 73-74 455(2-bolt)?

[screamingchief]

Neither.

Sell both and put that $$$ towards an IAII.

That's a healthy dose of juice.

[David Holmberg]

I agree, if you're spraying that much an IAII is needed.
And if you absolutely had to run a factory block, get a late 60's to early 70's 400 block and add billet caps and fill it to the top. (race only)
Then you might live at the 800 HP level, but who knows for how long.

[johnta1]

I just have to ask this.

If someone throws a rod through the side of an aftermarket block, will it be replaced free under warranty?

[71firebird400]

Originally Posted by johnta1

I just have to ask this.

If someone throws a rod through the side of an aftermarket block, will it be replaced free under warranty?

If you throw a rod, it isn't really a failure of the block.

[SupergasDil]

If you throw a rod, would the rod be replaced free under warranty ?

[Brian Baker]

Originally Posted by johnta1

I just have to ask this.

If someone throws a rod through the side of an aftermarket block, will it be replaced free under warranty?

If a tree fell in the forrest...and landed on a mime's head...would anyone care?

That much nitrous is definately aftermarket block territory.

[SupergasDil]

Ok, What if I build a Factory Block 455 to make about 100 horsepower then spray it with 700 shot of NOs ?

[johnta1]

Dil, don't use a 455 block.
Use a 400.

With all the 400's I have, I could go through quite a few before I got to the aftermarket price.

So, Brandn74, I'd use a 400 block with a stroker kit if you want the cubic inches.

With 500/more HP from the nitrous, the rods probably won't stay long in it anyway.

[David Holmberg]

Originally Posted by SupergasDil

Ok, What if I build a Factory Block 455 to make about 100 horsepower then spray it with 700 shot of NOs ?

How do you build a 100HP 455?

[Brandn74]

Thanks for the info gentlemen.I have a BIG MONEY race coming up with some local chevy boys and well you know the rest.

[David Holmberg]

Only if it was the block's fault, Jon.

And FTR, I didn't mean to leave the MR1 out, it would also be a choice for anyone looking to make more horsepower than a stock block will take.

[screamingchief]

Originally Posted by David Holmberg

Only if it was the block's fault, Jon.

And FTR, I didn't mean to leave the MR1 out, it would also be a choice for anyone looking to make more horsepower than a stock block will take.

Agreed,I probably should have said use that $$$ towards an aftermarket block,in a more general context,as opposed to stating a specific option,the choice is up to the end user,and at this point I dont really carry any preferences one way or the other.

How's that for diplomacy?

[BILTIT]

PDUDE- what do those pills=in HP?

Sorry, i dont understand the relationship between pills and the advertised HP of the kit.

[PONTIAC DUDE]

Originally Posted by BILTIT

PDUDE- what do those pills=in HP?

Sorry, i dont understand the relationship between pills and the advertised HP of the kit.

I go roughly by the manufactures listed hp to start but fine tune from there. HP can vary depending on cu.in and your combo with the same pills.

You can run a plate square or more nitrous then fuel and bump the pressure to atomize a little better.

Same deal with a fogger.
Ya start somewhere on the low side, jet wise, to get a grip on what your nitrous system tune up likes.

Remember, nitrous doesn't make the hp. The fuel does.

[Probird]

Originally Posted by PONTIAC DUDE

I go roughly by the manufactures listed hp to start but fine tune from there. HP can vary depending on cu.in and your combo with the same pills.

You can run a plate square or more nitrous then fuel and bump the pressure to atomize a little better.

Same deal with a fogger.
Ya start somewhere on the low side, jet wise, to get a grip on what your nitrous system tune up likes.

Remember, nitrous doesn't make the hp. The fuel does.

Come on Dude, you sound like a politician. Never really answered the question. Give us an estimate on the hp made with the jet sizes you listed. Is it anywhere near the amount this guy is wanting to spray?

I'm guessing by the question he asked that he knows enough about nitrous to be dangerous. It will take careful tuning at that level to get it done without hurting parts, especially with a stock block.

Now I have to ask. What other parts are in the plans to go with the stock block? Rods, pistons, crank, main caps, crankshaft? If these are also going to be stock or stock replacement type parts I would say it probably won't make a full pass. If these parts are good aftermarket parts that are up to the task of hp level you are planning to make with good machine work, it will live for a while but I wouldn't spray it too many times with that much juice. You would be living on the edge. The block would definatley be the weak link. Either that or the tranny, convertor, or rear end if you can put all that power to the ground.

[BILTIT]

''I have put 36/38/40 pills to a factory block.

I have put 120 plate pills to a factory block.''

So the first statement is a fogger and the second a plate system? That would make sense.

~300hp plate?

[David Holmberg]

Biltit, there is a lot more to it than just the jet size.

Once you get into custom tunes with different bottle and fuel pressures the factory listed HP numbers are out the window. Its all about flow rates and distribution.

[BILTIT]

Ya, starting to see that. Just easier for me to keep everything straight in my head as a reference.

[EVIL_TWIN]

GOOD LUCK
Go For it.... everyone here is doom and gloom, can you post the carnage pics after?
I have always thought it was cool to see a motor come apart.... as long as it isnt mine.