Kredz28

I see forums over on ls1tech all the time where guys make 1000+ hp with a built ls1. Im thinking about opening up the bottom end of my 355 and adding 4 bolt splayed caps, forged crank, better rods and diamond pistons.

I want to put a 3.4 inch pulley on my F1A and see what happens! With a built 383 with all the doo dads, will i even get close to 1000 with a 3.4 inch pulley?

RealQuick

hmmm... 1000fwhp or 1000rwhp?

I see you getting to 800-850rwhp max with the F1A... that will convert to ~1000fwhp.

Now if you want 1000rwhp, time to start rethinking your combo.

Kredz28

RWHP

Thought the F1a could make more than 850 rwhp. Im assuming I can boost 25+ psi with an f1a..so theres NO WAY to make 1000 rwhp with this combo? I could get there with some spray on top

roguedriver

...with one 255 in tank? Your gonna need to do more then the pulley. A healthy fuel system, some cubes, some strength and some boost and its very possible. Its all in the details though.

Ken R.

RealQuick

Not with those heads. You are going to need something special to get there IMO.

ak95ta

Id also imagine you might need a cog drive for the blower to see 25 psi. But your definatly going to need a fuel system. Maybe a 300 shot???

ramair96ws6

you will break the block. 1000hp at the crank is all it will take unless you fill the block. trust me. We built an Impala that made 890 rwhp through a th400 and loose converter F1r and it twisted the block and broke the heads. filled the block with a F2 the car made 1200 rwhp

boosted-lt1

ramair96ws6,

I'd be interested in what broke in the example you gave. Was it the block that broke or the heads because of deformation in the block? It was a little hard to tell from the wording. Was the block checked for thin areas in the bores?

What type of fill did you use on next build?


Kredz28,

1000hp is no every day setup on an LT1 - in my opinion. I will admit that I'm only begining to research and understand what it might take to build a high horsepower LT1 with boost - The mains being one, at much less than 1K.

The LS1 has capability to flow a lot more air than a 23 degree SBC. With our 'flow-limited' head, you push the motor a lot farther into detonation in order to hit your goal.

I'll let others continue..

-Scott.

ramair96ws6

The block twisted like a rag from the force. The Block was no longer square. (this was a fresh motor less than 5 runs). The block twisted so much that it broke the heads.

Sparkz28ss

didnt SleeperZ make close to 1000rwhp with a 383Lt1 with twins?

i dont remember him having any block issues

ramair96ws6

was the block filled half filled with block filler? I know after we half filled a new block the car made over 1200rwhp and never had an issue. When the block wasnt filled is when we has the issues.

1000 with turbos is differnt then 1000 with a blower. The motor with the blower is making more hp but it is being robbed by the blower.

Kredz28

When you guys talk about the block being filled, are you referring to filling the water jackets half way? Does that pretty much kill the daily driver car?

boosted-lt1

Kredz28,

From what I've gathered, there should not be any change in water temperature when using a street fill (half fill). With this the jackets are filled up to the bottom of the freeze plugs.

Couple of points: Cylinder walls considerably stiffened. Stiffer bores deflect/distort less under load which means better cylinder sealing and more power. Really should help as well to offset thin areas due to shift or large over-bore. Cylinder temps are greatest at the top portion of bore (top ~1") and you will still have water in that area and in the head. So you lose total water capacity but retain it where it's needed the most. This could also mean increased system circulation. Increased insulation in lower part of the bore meaning higher oil temperature. May need to consider an oil temp gauge and cooler.

http://www.hardblok.com/

-Scott.

Kredz28

Thanks for the info...very interesting!

Blownbird355

I think LJ was very close to 1000rwhp if not there.