Leukic

I checked out the big dogs list and it looks like there are a lot of 346 and 400+ ci motor with SC or TT hitting the 800 plus range. I am at the start of my journey for the 800+ club and I am just looking at peoples opinions for the best setup motor wise with a SC to hit these numbers.
-J

CamminC5

I'm running a LQ9 390ci with a YSI making 880/770. Heads are worked 243's.

Leukic

That's the 6.0 block correct?

PEETYZ

Iron 6.0 correct :


D1SC,Novi 2k, Novi 2500, Ysi, F1A/C/R/X, etc all will get you 800+ on just about any block with the right amount of boost

EDIT:

Even the T trim and novi 1,500 will be getting up there (800ish) with the right combo.


For 800 rwhp you can keep it pretty simple with a forged 346 on a D1 or bigger blower. From what Iv'e seen 1k will require atleast a YSI or bigger and you may want to consider an iron block for added strength at that point but plenty of people have pushed the aluminum blocks that far.

Turbo-Geist

I recommend the stock engine for 800 rwhp with the appropriate modifications.

Purchase a blower, single turbo or twin turbo kit that is capable of moving the air required.

Add:
Head studs and new head gaskets
Aftermarket camshaft, springs, and pushrods
Methanol Injection
Injectors
Convert to return style fuel system with rail mounted regulator
255 lph or greater in-tank pump
Racetronix harness
Boost-a-pump
2.5 bar MAP sensor
Free-flowing exhaust
Tune

Now increase boost and fuel until you hit 800rw.

blown81bu

416 w novi 2000 or 2200r/ysi...easy 800+

blown81bu

how important is the return system?..I have the lonnie double pumper system w billet rails and one feed on the front and other feed on the rear of the other rail

Turbo-Geist

How much power are you making? I had the 255 in-tank, racetronix hotwire kit, meth injection and 60# injectors and was having fueling issues at about 580 rwhp. I purchased 97-98 fuel rails and added a boost referenced regulator and return line and the fueling issues were solved.

Turbo-Geist

I pulled the following from an old post and made a couple of changes based on where I ended up:
---
Fuel delivery is one of the most important things to pay attention to when pushing for more power.

To be very conservative I would rank it like this for 93 octane fuel:

1. 500 to 525rwhp: No meth, stock fuel system, Hot wire kit, 60# injectors.

2. 525 to 550rwhp: Meth, stock fuel system, Hot wire kit, 60# injectors.

3. 550 to 575rwhp: Meth, stock fuel system, 60# injectors, Hot wire kit, BAP.

4. 575 to 650rwhp: Meth, stock fuel system, 60# injectors, Hot wire kit, BAP, return line, 1:1 regulator.

5. 650 to 700rwhp: Dual Nozzle meth, stock fuel system, 80# injectors, Hot wire kit, BAP, return line, 1:1 regulator.

6. 750+rwhp: Consider installing a secondary fuel pump and correct size injectors. May want to consider additional octane.

Notice I recommend an injector change to atleast 80# when trying for 700+ rwhp but people have made it with 60# injectors. I made over 750rwhp without a second fuel pump but the meth was acting as additional fuel.

These ranges will depend on many variables such as how much meth you are using, what type of A/F ratio you are trying to achieve, supercharger vs. turbo,etc. It also depends on what type of engine modifications are installed for more air flow.

The list above is very conservative. People have surpassed these values. I'm conservative and tend to err on the side of too much fuel capacity. It gives you a little bit of cushion in case something happens. Fuel upgrades are usually way cheaper than replacing an engine.

blown81bu

who knows..made 804 on a mustang with a slipping belt and unlocked converter...
i really hate the dyno killed my trans quick

breecher_7

346-427ci will all make the power you are after. Easiest build would be a 364ci or 402ci using either a Iron 6.0 or a LS2 block. I wouldnt get a blower smaller than a YSI. You want room to grow.... I would have the main caps pinned regardless of that block you choose, extra insurance....

CamminC5

I had the same issue, and it was solved by going to a return after the rail system.

Can also back up needed more than a single in tank fuel pump after 750rwhp. That's exactly where mine ran out of fuel.

breecher_7

Twin 340's in tank, -8 feed to billet rails, Boost referenced regulator on return side with -6 return to tank… Problem free for 5 years and 20,000 miles now at 700-1000 whp

69ls6

I'm making 1042 on a Ysi and 347.. Call me I can help you save a bunch of money..

PEETYZ

redcycle13

I tried for 800rwhp on a 9.5 compression forged 347 with d1sc, and only got 750. I wish I would have gone with a stroker from the start. The power out of boost just wasn't there. I'm in the process of building a LS7 headed sleeved 5.3 aluminum block with 434 cubic inches with the same blower. I expect at least 800rwhp.

69ls6

Be lucky if it will make 750 again..with that small of blower.its not motor size its blower size..

Rkreigh

usually the small displacement engines will do ok UP top

I'm considering a 370 build 4.0 stroke in a 4.8 iron block with AFR 225 heads

how much can you bore the block and still make 1k hp?

I'm thinking I'll stay smaller on the bore to keep the block strong, I don't want to fill it or anything and I've hear the cast iron blocks are a PITA to keep cool on the street

I like the idea of the sleeved 5.3 block

how much was that? darton sleeves?

very nice setup with the big LS7 heads that should flow like gangbusters

redcycle13

My block was right at $3000 with Darton sleeves, and doweled main caps (block core included in that price). Supposed to be much stronger than a stock LS7 block. The sleeves could be bored for even larger displacement, but 4.155 was the largest Steve at R.E.D. recommended for high boost.

redcycle13

I've seen a D1 make over 800 in several builds. This combo is setup for very high efficiency, I'll be surprised if it doesn't hit that number. The peak power isn't really the main goal anyway, its much better power out of boost I'm going for. Putting down anything over 700 is hard to do on the street.