Re: 451 low deck
[Re: buck440]
#1114820
11/16/11 01:24 AM
11/16/11 01:24 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
not sure if this is where i ask this question but here we go. guys i was wondering what is all envlved in building a 451 from a 400 besides the grinding of the 440 cranks mains. is there block or cylinder notching involved? pics an all the technical specs would be greatly apreciated. an what kind of power are these capable of?
You need to cut down the counter weights a good .120" to clear, no block prep needed, There is good power to be had in a 451 lowdeck, mine was a very simple build with FTs, XE284H, headers, M1 single, 750dp, 4.10 gears & 4400 stall, in my 75 Duster it pulled off a 10.91 shifting at 5600, race weight was just below 3100 lbs., weight is your worsed enemy, so keep the car light & you'll be happy.
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Re: 451 low deck
[Re: joedust451]
#1114821
11/16/11 01:51 AM
11/16/11 01:51 AM
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Joined: May 2010
Posts: 295 maryland
buck440
OP
enthusiast
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OP
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Joined: May 2010
Posts: 295
maryland
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Quote:
Quote:
not sure if this is where i ask this question but here we go. guys i was wondering what is all envlved in building a 451 from a 400 besides the grinding of the 440 cranks mains. is there block or cylinder notching involved? pics an all the technical specs would be greatly apreciated. an what kind of power are these capable of?
You need to cut down the counter weights a good .120" to clear, no block prep needed, There is good power to be had in a 451 lowdeck, mine was a very simple build with FTs, XE284H, headers, M1 single, 750dp, 4.10 gears & 4400 stall, in my 75 Duster it pulled off a 10.91 shifting at 5600, race weight was just below 3100 lbs., weight is your worsed enemy, so keep the car light & you'll be happy.
not a problem my duster weighed 2860 with a iron headed 383 in it thanks for the info.
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Re: 451 low deck
[Re: buck440]
#1114824
11/16/11 06:51 AM
11/16/11 06:51 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Some background on the 451 "B". I think much of the success of the 451 combination was from articles in Chrysler Power magazine in the late 1980's. They were putting turned down 440 cranks in with stock cast pistons milled for the compression height. Because of the shorter deck height the pistons weighed less than a 440 so the engines would RPM good and were cheap to build, considering no one wanted 400 blocks, they were much cheaper than buying a 440. One of the first failures was the piston pin pulling out of the stock cast piston at sustained high rpm. So custom (at the time) forged pistons were used and I think the custom pistons also allowed running the longer 440 rods. At this point 451 "B" had the same stroke and rod length (and about the same bore size as a 0.060" over 440), but with pistons that weighed about 1/2 as much as the 440 piston. The lighter weight pistons also reduced the stress on the crank and rods. So at the time the big deal was the low cost of the 400 block and light weight pistons. The "B" engine may also have some strength advantages over the 440 "RB" with shorter cylinders they should be stiffer, the shorter deck height uses shorter pushrods (stiffer and weigh less),the smaller main bearing size reduces friction and allows more material in the main webbing and caps, but that's usually not a problem on a 440, but the difference is usually mentioned. Another issue is the shorter deck height "B" engine at 9.98" compared to a 440 "RB" at 10.725" results in the "B" engine being slightly narrower so it fits easier in A-Body cars. Anyhow, 500 HP is easy with decent flowing heads and a mild cam. With better heads, and some cam 600 HP is not too hard to make. 700+HP is possible with good aftermarket heads and a bigger roller cam, but at this level you will want a stronger than stock crank and rods, so larger strokers are usually built. The 500" "B" stroker with 4.15" crank still uses the longer 6.768" rods and a pretty short compression height piston requiring oil ring supports. This is a nice combination for a higher winding 7,000+ RPM engine. The 4.25" stroker 512" kits use a shorter rod, and are really nice for a street engine that does not need to spin 7,000 RPM.
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Re: 451 low deck
[Re: buck440]
#1114825
11/16/11 04:05 PM
11/16/11 04:05 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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I have seen friends Duster go 9.70s with 451, stock eddie rpm w/452 heads ran 10.2/10-30s stock rods, (aries pistons tho.) 430 gear 33 tall tire,, oo the motor stayed together some 10 years
Last edited by dennismopar73; 11/16/11 04:06 PM.
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Re: 451 low deck
[Re: buck440]
#1114831
11/17/11 11:56 AM
11/17/11 11:56 AM
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Joined: Jan 2003
Posts: 17,840 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,840
S.E. Michigan
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I like mine alot, I built it at home, and it does pretty much what I wanted it to do. PM me if you have any kind of specific questions you don't want to post, but it's all be covered pretty well. The way I look at it is: If you like 440s, then you will love the 451 low deck. It acts similar to a bored out 440 in some ways, but seems to like RPM maybe slightly little more...it is smaller on the outside...gives more room for big headers, and more room for taller intake manifolds. No better use for an old steel 440 crank with trashed mains
Rich H.
Esse Quam Videri
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Re: 451 low deck
[Re: Biginchmopar]
#1114833
11/17/11 10:21 PM
11/17/11 10:21 PM
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Joined: May 2010
Posts: 295 maryland
buck440
OP
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maryland
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Quote:
All the work is in the crankshaft.
Mine makes 525hp 500tq at the rear wheels and is street driven on a regular basis.
so theres no block notching or a nothing like that?
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Re: 451 low deck
[Re: buck440]
#1114836
11/18/11 12:08 AM
11/18/11 12:08 AM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Here is one I recently did....you'll notice the chamfer on the inner crank throws. This must be done to clear some block casting in those areas. You can also gring the block to help clearance this. It is also possible to put a 440 crank in with no or minimal crank work, but a lot of grinding in the upper saddle areas. A poor mans stroker is possible this way, but its not the best way in my opinion. I did one with a cast 440 crank to see what it involved, and didnt care for it much myself.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: 451 low deck
[Re: CompWedgeEngines]
#1114837
11/18/11 12:09 AM
11/18/11 12:09 AM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: 451 low deck
[Re: CompWedgeEngines]
#1114838
11/18/11 12:11 AM
11/18/11 12:11 AM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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440 crank with no turned counterweights, only clearanced block, but needed chamfered counterweights
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: 451 low deck
[Re: CompWedgeEngines]
#1114839
11/18/11 12:14 AM
11/18/11 12:14 AM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Also a 451...
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: 451 low deck
[Re: dogdays]
#1114843
11/18/11 01:23 PM
11/18/11 01:23 PM
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Joined: Jan 2003
Posts: 9,872 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,872
Weddington, N.C.
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Dog, Yeah I remember Arias would make you a 451 slug, with a .990 pin and you had to bronze bush your LY (or my prefered 383) rods. The undersize of the slug had "427" (chevy BB) cast into it. You're right Arias and Venolia were about the only 2 Piston players that would make you one back then. It was expensive but fun times, very 'hush-hush' back then in the pre F.A.S.T. days when we had a few very quick '383's trawling around
Last edited by Streetwize; 11/18/11 01:32 PM.
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Re: 451 low deck
[Re: Streetwize]
#1114844
11/18/11 02:02 PM
11/18/11 02:02 PM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Everyone ( the customer ) has different needs,wants,expectations and especially budgets . I would love to sell every single customer a new crankshaft,rods and pistons. That would be a perfect World indeed. The reality is that simply isnt going to happen. When you build enough engines as a business, and not a hobby, you find out you deal with an incredible cross section of " personalities". They have many many different requirements. This is where a builder needs to put himself in the customers shoes as if it was their money and build. I agree that its always best to use new parts whenever possible. I recently did a 451 with stock crank and stock 400 rods. There was no need for this guy to buy a new aftermarket crank and h beam rods. He took that money and put it into a set of Edelbrock heads. He wanted a torquey,simple drive it anywhere street car. Thats what he got. The original poster asked some specific questions obviously so he knew more about how to make 451. Does he need a new crank? I dont know. None of us know his budget or needs at this point. Good info here, but be careful of simply broadbrushing everyone into the same picture. Bobby, i do agree on the 4.250 crank motors much of the time. Usually just makes sense, but again, not everyone wants or needs maximum torque and horsepower. What did thoseu 431's go in amd how did they run? What heads and cams? I like the availability of the 383 blocks for the street/strip guys.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: 451 low deck
[Re: buck440]
#1114845
11/18/11 04:50 PM
11/18/11 04:50 PM
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Joined: Nov 2010
Posts: 1,397 Carson City, Nevada
Biginchmopar
pro stock
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pro stock
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
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Quote:
Quote:
All the work is in the crankshaft.
Mine makes 525hp 500tq at the rear wheels and is street driven on a regular basis.
so theres no block notching or a nothing like that?
NOPE!
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Re: 451 low deck
[Re: buck440]
#1114850
11/19/11 03:22 PM
11/19/11 03:22 PM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Please pm me your phone number
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: 451 low deck
[Re: 440Jim]
#1114852
11/19/11 07:06 PM
11/19/11 07:06 PM
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Joined: Jan 2003
Posts: 16,923 NC
440Jim
I Live Here
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I Live Here
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Posts: 16,923
NC
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With typical 6.76" long connecting rods, a piston with a compression height about 1.32" puts the piston near zero deck. Some specific rod lengths, pistons, and block deck heights may result in the piston down the hole (low compression ratio); so check the details (especially the machined deck block height) of the parts you plan to use:
+9.980 Block deck height (could be 9.97x after machining) -1.875 Crank stroke divided by 2 (3.75/2) -6.768 Connecting rod length (many H-beams are 6.760") -1.320 Piston compression height ------ 0.017" below the deck
And be sure the pistons you buy use the pin diameter to match the connecting rods you use (1.094", 0.990" common)
Examples of pistons: Bore___CH__weight_ring pack sizes__piston pin size_ part no. 4.375, 1.320, 510g, 1/16, 1/16, 3/16, 1.094 x 2.930, 99494 Ross 4.375, 1.320, 527g, 1/16, 1/16, 3/16, 0.990 x 2.930, 99495 Ross 4.375, 1.313, 524g, 1/16, 1/16, 3/16, 1.094 x 2.930,131175 JE 4.375, 1.313, 525g, 1/16, 1/16, 3/16, 0.990 x 2.930,131174 JE 4.375, 1.300, 515g, 1/16, 1/16, 3/16, 0.990 x 2.930,K296A35 Wiseco
Check KB also. I don't know if all the above are still available, but they were stocking parts back then.
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Re: 451 low deck
[Re: buck440]
#1114855
11/21/11 06:08 PM
11/21/11 06:08 PM
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Joined: Feb 2004
Posts: 1,093 Long Beach, CA
Mike Swann
super stock
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super stock
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
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I have a 451 for sale . . . 3.45 x 4.560
Last edited by Mike Swann; 11/21/11 06:14 PM.
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Re: 451 low deck
[Re: larry890]
#1114856
11/21/11 07:07 PM
11/21/11 07:07 PM
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Joined: May 2010
Posts: 295 maryland
buck440
OP
enthusiast
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OP
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Joined: May 2010
Posts: 295
maryland
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Quote:
My 451 is low 700 hp, pushes my 3600lbs car 9.73to 9.85 all day. and the best news is its FOR SALE for way less than you could build it.
how much you can pm me if you like.
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Re: 451 low deck
[Re: Mike Swann]
#1114857
11/21/11 07:09 PM
11/21/11 07:09 PM
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Joined: May 2010
Posts: 295 maryland
buck440
OP
enthusiast
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OP
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Joined: May 2010
Posts: 295
maryland
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Quote:
I have a 451 for sale . . . 3.45 x 4.560
yours is very nice an way out of my price range thanks.
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