Ok guys I'm just thinking out load here..but wondering what and how to make 850 with a low deck and -1 heads..I know race block thinking aluminum of course..also which size low deck would be the easiest to do it..I kinda like 540 myself but like to here from the more experienced....I have t&d 1.6 rockers -1 heads 2.25 valves just a clean up for now so I know they will be sent out once things are sorted out. ..

If you are going with an after market block WHY are you setting the limits with a low deck block???

So I'll be better with a rb. ..it's not out the question I know where there's a new world block on the pellet right now..so that's a option as well ..let's hear them all then b/rb.

Mines never been dynoed. Runs 9.0-9.1/147-149 @ 3350lbs, 4.10, 10.5x31, foot brake. Best 9.02@151. Tall deck Mega block 4.5x4.5,-1 from Modern cut to 58cc, Comp .471" lobe 285/292 on 112 LCA in at 108,T&D 1.7,Trend 7/16 tapered, Flat top .043" ring, 14.8-1, Indy cross ram with either Holley or Eddy 750's,GZ pump, out of the box 2 1/8" Hookers. My bet is a good single plane and Dominator would be quicker. Probably would like a bigger header and more gear as well. Never run it past 7000-7100.
Doug

I went with a shorter stroke 4.15 crank and 4.5 bore to make 528 cubes which at the time I felt matched the 440-1 heads well. I really don't have much info to go on other than my own best ETs and a preliminary dyno sheet. Made 847 hp with a lousy dragster pan and only one inch vacuum. 800 hp at 5700 rpm, max power from 6400 to 7000 rpm within ten hp or less. A new pan and better cam after the dyno session lowered the ET some.
My 440-1 heads are the early versions, so I assume there is a bit more power in the newer version. I run Alky, Terminater injector, 3X intake, .775 lift roller, 62 cc chambers,15/1 compression, Very short dome, (.080?) full porting. Jesel vlave train. I am eventually going to go with 1.7 ratio rockers I have. Best ET was 8.77 at 153 mph, at altitude and 3055 pounds with a TF.
You can go either way, low deck or hi, but the low deck eliminates the 3x intake and any tunnelram but a custom made piece. The low deck will be a bit lighter, and a little narrower in the chassis.
If you are willing to consider budgeting for them, going with a high dollar block begs for better heads. Your basic upper limit will be 850 to 900 hp with the 440-1 heads, and there is another 150 hp possible if you switch to B1Mc heads.

I have been thinking on the b1 deal..wish I would have made that move in the beginning. ..

This is what I have in the car now .
451 lo deck 13.1 alky 737 705 roller td 1.6 rockers custom headers 2.25 into 4inch collectors 727 8in 5600 versa ford 9in 456 gear 31/15 mt slicks tube chassis 73 duster hopefully about 2400lbs glass front doors Truck back bumper lexan all around all aluminum int...my son will be learning with this set up but I know we are way behind in power now days around here...not trying to be the fastest but not the slowest either. ....I'm looking at a build for 2016 and would like to start collecting parts..around here now if your not 50 or faster your kinda in the way..saw about 3 4 4sec. Cars Saturday night just testing. .1 been 442 and shut it down got on intercom told everybody they can get the back tire grudge race run your car not your mouth ..not trying to be that fast but 50 on muscle is a good start ..

I've had two motors that made close (526 C.I.high compression bracket motor 440 block that made 845 HP on race gas and 518 C.I.,10.78 to 1 comp. ratio 400 block 775 HP on pump gas Both motors where dyno tested on a DTS engine dyno in Klamath Falls, OR which is at 4300 Ft elevation, I don't remebmer the uncorrected numbers now but the pump gas motor ran faster,9.993 at 134.+ MPH through the full 3 inch exhaust on Oregon 91 octane pump swill than my 3450 lb Duster was legal for ) to your goals with the same set of 440-1 CNC ported by Jeff at MCH. That set of heads had the 2.250 intake valves and the standard size ehaust valves, those heads flowed right at 370 CFM at .700 lift. I'm building another, better, 400 block 518 C.I. bracket motor now with a vacume pump and a set of CNC ported 440-1 with Jesel paired shaft rockers, I'm hopng it will make real close to 900 HP on E85 with one carb.

find a race block first

On the list. .but which would make more power or be easier to get to power level I'm looking.

B-1 has a sale this time of year

http://www.b1heads.com/pdf/Koffels_Head_Sale.pdf

boost would probably be the easiest and cheapest way to go. Plus you won't need and huge lumpy bumpy cam, steep gears or a crazy stall. You also get the benefit of a drivable 850hp car.

A low deck is limited to Indy MW intake. With an RB block you can run a Super Victor intake or the 3X intake.

850 hp isn't too difficult with well prepared -1 heads. I don't think you want a really big engine though, I'd probably keep the stroke at 4.15 or 4.25. Use a race block and a 4.500 bore. (or 4.440 to start with so you have some cleanup left in the block)

If the heads are done correctly then you'll just need some compression, a big cam, a good intake, big carb and good oil system. Some pan vacuum will help.

I've been making more than 900 hp with my EZ heads on the 514 shortblock, but the engine isn't very reliable. I went with fairly high compression to make the power and the margin for error is small. For a bracket engine I'd probably keep the compression down around 13:1 just so the engine isn't so twitchy. You can make more power by going with more compression but then you really have to stay on top of the tune up.

Mine made 882 HP @ 6700 and 772 lb-ft @ 5700. It was a 572 (4.5x4.5) in a world RB block. Heads were 440-1 flowing 357 with a 68cc chamber. Pistons were ross forged flat tops. Cam was a Compu-flow special so I do not have the details. Intake was a indy with dominator flange. Carb was an 1150 alcohol version. On Gas it made 842.

Bob Spelic

World block, 4.5x4.5(572), 14:1. Indy 440-1 CNC 345, Jesel 1.7, .780 cam, no vacuum pump.
Heads flowed 377/282 @ .750

440-2/440-2A with 1150 - 786tq/872hp
Indy TR, 2 x 750's - 811tq/911hp

9.04 @ 148 at 3660lbs

So I'm seeing more inches here..should I just go 572
.would that make it easier to achieve. .

Two ways RPM or Cubes. Most choose the cube way as it is less money and maintenance

I don't think you can make a 400 block with either the 2.200 or 2.100 rod journal size make 572 C.I. Maybe with the 1.88 rod size, maybe not I'm not a big fan of any stroke over 4.500 in any stock type RB Mopar block, let alone in a low deck stock type block If you wanted to step up to a after market race block then go for it, larger C.I. is better for making HP and torque

Hey cab yesterday next build is going to be a race block..

My chosen engine shop that does my machine work wasn't afraid to tell me to go a full 4.500 bore right from the start. His opinion is take care of the motor well, and when it loosens up after a few rebuilds, hone it out to 4.502 or what ever the smallest it will clean up and order new pistons. You can do it again down the road if you still have the same motor. With rings being available in .005 over, as long as piston makers will custom make a slightly bigger piston, you can get a lot of life out of a Mopar 4.8 bs block.

Says there taking orders for the KP block did any else pick up on that fact?