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What kind of power can you get from a stroked 400 block #1035201 07/18/11 10:32 PM 07/18/11 10:32 PM
Joined: Aug 2010 Posts: 185 east bay ca T torqueaddict OP member
torqueaddict OP member T Joined: Aug 2010 Posts: 185 east bay ca	Guys I have been thinking of going with a 400 block stroker. Originally I was gonna say a 451 but I have been seeing info stating they can produce between 600-700 hp. Is this true and if it is what size displacement would most likely be required to get those kind of numbers?

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035202 07/18/11 10:36 PM 07/18/11 10:36 PM
Joined: Oct 2005 Posts: 8,882 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,882 Ontario, Canada	The most popular displacements are 505 and 512. The "package" will determine the final power output but those numbers you're stating are easily achievable with the right parts combo - and not a whole lot of money either!

Re: What kind of power can you get from a stroked 400 block [Re: Stanton] #1035203 07/18/11 10:40 PM 07/18/11 10:40 PM
Joined: Aug 2010 Posts: 185 east bay ca T torqueaddict OP member
torqueaddict OP member T Joined: Aug 2010 Posts: 185 east bay ca	Really? If you go with a high displacement on the 400 stroker will you have to go with an external oiling system like with the 440? I might go with the 505 if I can get the right performance from it.

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035204 07/18/11 11:18 PM 07/18/11 11:18 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Up to 4.25" stroke/512 ci minor clearancing only is normally neaded for internal oiling. The pickup boss is the main area that may need a little die grinder attention. The 4.25" stroke with 2.2" chevy rod journals is supposed to be easier to fit than the 4.125" with Mopar journals that I am running. Plan to stick with a 3/8" pickup. With a decent pan and basic clean up of the oil passages it works fine up to at least 6500 RPM.

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035205 07/19/11 01:54 AM 07/19/11 01:54 AM
Joined: Feb 2005 Posts: 5,221 Branson, Mo. J joedust451 super gas
joedust451 super gas J Joined: Feb 2005 Posts: 5,221 Branson, Mo.	Quote: Guys I have been thinking of going with a 400 block stroker. Originally I was gonna say a 451 but I have been seeing info stating they can produce between 600-700 hp. Is this true and if it is what size displacement would most likely be required to get those kind of numbers? You should have no problem getting 600 HP with a 451, A good set of heads like EZs with a max window, 620-640 lift solid or roller, 12.1 compression, Good intake & at least a 1050 carb, 2.25 in. headers or possibly a TR, do all the necessary oiling mods to the crank/block. I had close to 500 HP on my 451 with ross FTs, iron heads & a small solid, The guy i sold it to made a few changes & started shifted it at 67-6800 & it trapped over 7K with no issues, this was on stock 440 rods with ARP wavelock bolts & stock forged crank, The engine already had a good 250 passes on it just from me, it just recently lost compression in 3 cylinders from tired rings & i built it back in Feb. 04, no spun bearings or rods through the block, I say go with a 451 you'll love it A trans builder i knew in Amarillo had a 73 Swinger, built up a 451 with B1s if memory serves me, had a big ass cam & the works, The Alt. was 3700 ft. at our track, he ran 10.teens in that car & drove it on the street, it was a 9.5 car at or around sea level easy, he had the fancy oiling system on his & all was good, I know for sure it had over 600 HP & he had a stock 400 block, the 230 casting. 75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035206 07/19/11 02:11 AM 07/19/11 02:11 AM
Joined: Sep 2003 Posts: 1,168 Vancouver, WA MoparMarq super stock
MoparMarq super stock Joined: Sep 2003 Posts: 1,168 Vancouver, WA	470 with 440source kit. 496 HP at 5200, 553 ft-lbs at 3800. Eddy RPM 84cc. Dual plane. Eddy 800 AVS. Comp Extreme Energy 284/.484 (IIRC) hydraulic cam. Factory electronic dist. Wanted a streetable engine. Built and dynoed by a guy in Tigard, OR.

Re: What kind of power can you get from a stroked 400 block [Re: joedust451] #1035207 07/19/11 02:12 AM 07/19/11 02:12 AM
Joined: Aug 2010 Posts: 185 east bay ca T torqueaddict OP member
torqueaddict OP member T Joined: Aug 2010 Posts: 185 east bay ca	What if I use a set of ported stealth heads and go with 11.1 compression what kind of numbers would I be looking at then? I already have the stealths and I wanna run pumped gas. I found a 400 motor for sale. I already have the 440 rods and the stock forged crank. I will just need a good set of pistons and my machine guy to do a port job for me.

Re: What kind of power can you get from a stroked 400 block [Re: MoparMarq] #1035208 07/19/11 02:14 AM 07/19/11 02:14 AM
Joined: Aug 2010 Posts: 185 east bay ca T torqueaddict OP member
torqueaddict OP member T Joined: Aug 2010 Posts: 185 east bay ca	Quote: 470 with 440source kit. 496 HP at 5200, 553 ft-lbs at 3800. Eddy RPM 84cc. Dual plane. Eddy 800 AVS. Comp Extreme Energy 284/.484 (IIRC) hydraulic cam. Factory electronic dist. Wanted a streetable engine. Built and dynoed by a guy in Tigard, OR. Is that at the wheels or at the crank? I kinda want at least 450 at the wheels. I know alot of hp is lost in the drive train.

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035209 07/19/11 02:31 AM 07/19/11 02:31 AM
Joined: Sep 2003 Posts: 1,168 Vancouver, WA MoparMarq super stock
MoparMarq super stock Joined: Sep 2003 Posts: 1,168 Vancouver, WA	Quote: Is that at the wheels or at the crank? I kinda want at least 450 at the wheels. I know alot of hp is lost in the drive train. At the crank. What is the loss percentage to the wheels? Don't know, but probably 20% would be a minimum, I imagine...

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035210 07/19/11 02:32 AM 07/19/11 02:32 AM
Joined: Feb 2005 Posts: 5,221 Branson, Mo. J joedust451 super gas
joedust451 super gas J Joined: Feb 2005 Posts: 5,221 Branson, Mo.	Quote: Quote: 470 with 440source kit. 496 HP at 5200, 553 ft-lbs at 3800. Eddy RPM 84cc. Dual plane. Eddy 800 AVS. Comp Extreme Energy 284/.484 (IIRC) hydraulic cam. Factory electronic dist. Wanted a streetable engine. Built and dynoed by a guy in Tigard, OR. Is that at the wheels or at the crank? I kinda want at least 450 at the wheels. I know alot of hp is lost in the drive train. Thats most likely at the crank, I'm sure you can get around 560-570 FWHP with the stealths, that'll be close to 500 at the wheels (maybe around 480). I'd look into a 620 lift. cam, The Indy dualplane from what i've heard is a great intake, A 1050 Dom. & at least a 2" header. 75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU

Re: What kind of power can you get from a stroked 400 block [Re: joedust451] #1035211 07/19/11 11:17 AM 07/19/11 11:17 AM
Joined: Aug 2010 Posts: 185 east bay ca T torqueaddict OP member
torqueaddict OP member T Joined: Aug 2010 Posts: 185 east bay ca	Thats most likely at the crank, I'm sure you can get around 560-570 FWHP with the stealths, that'll be close to 500 at the wheels (maybe around 480). I'd look into a 620 lift. cam, The Indy dualplane from what i've heard is a great intake, A 1050 Dom. & at least a 2" header. Ok that would work so I can simply go with a 451 kit and get those results, I think I have my blueprint.

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035212 07/19/11 11:45 AM 07/19/11 11:45 AM
Joined: Oct 2005 Posts: 8,882 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,882 Ontario, Canada	You haven't mentioned whether this is a street or strip engine - which would affect the build. Personally I would opt for the bigger cubes and avoid the high compression. And for your HP target I'd avoid the stock rods and crank like the plague!

Re: What kind of power can you get from a stroked 400 block [Re: Stanton] #1035213 07/19/11 12:04 PM 07/19/11 12:04 PM
Joined: Aug 2010 Posts: 185 east bay ca T torqueaddict OP member
torqueaddict OP member T Joined: Aug 2010 Posts: 185 east bay ca	Quote: You haven't mentioned whether this is a street or strip engine - which would affect the build. Personally I would opt for the bigger cubes and avoid the high compression. And for your HP target I'd avoid the stock rods and crank like the plague! Its a street engine that may never hit the track. The bigger cubes would be nice but I keep hearing the 451 is more powerful. If I buy the kit from the source I would most likely want a bigger kit more like a 470 or bigger.

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035214 07/19/11 12:11 PM 07/19/11 12:11 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier I Live Here
DPelletier I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Quote: The bigger cubes would be nice but I keep hearing the 451 is more powerful. explain. Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: What kind of power can you get from a stroked 400 block [Re: DPelletier] #1035215 07/19/11 12:43 PM 07/19/11 12:43 PM
Joined: Aug 2010 Posts: 185 east bay ca T torqueaddict OP member
torqueaddict OP member T Joined: Aug 2010 Posts: 185 east bay ca	Quote: Quote: The bigger cubes would be nice but I keep hearing the 451 is more powerful. explain. Dave I mean stronger, not more powerful. I also have been told it can reved higher and with stock rod length would be longer lasting aswell.

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035216 07/19/11 04:01 PM 07/19/11 04:01 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	The three most deadly words when used about the Internet, "I have heard". There is no replacement for displacement, except a blower. Chuck Senatore said the word, "Build the biggest shortblock you can afford". Your name is "torqueaddict". Torque is directly related to cubic inches. More's law: If some is good, more's better and too much is just right. Get the picture? Build the 4.25" stroker using the Chevy rods. Reciprocationg and rotating weight will be down. The engine will rev like a smallblock. B/RB engines have so high a deck that worrying about rod length and longevity is a complete waste of time. For compression I would go no higher than 11:1 with plenty of squish, using zero deck pistons with the Stealth heads. It should be easy as falling out of bed to get 600hp from this combo with a little work on the heads. R.

Re: What kind of power can you get from a stroked 400 block [Re: torqueaddict] #1035217 07/19/11 04:59 PM 07/19/11 04:59 PM
Joined: Mar 2005 Posts: 2,060 Pendleton NY T terzmo top fuel
terzmo top fuel T Joined: Mar 2005 Posts: 2,060 Pendleton NY	Friend ran a 451 and did 12.30's in the qtr...70 charger....10 to 1 pistons..not too shabby

Re: What kind of power can you get from a stroked 400 block [Re: terzmo] #1035218 07/19/11 06:16 PM 07/19/11 06:16 PM
Joined: Oct 2005 Posts: 8,882 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,882 Ontario, Canada	Revving a motor when you don't have to is asking for trouble. Biuld a big-inch thumper with enough torque that you don't need a huge gear or ridiculous converter. Pick the piston carefully such that you have reasonable compression but you can machine for quench. Forget about HP numbers - since they're a function of torque and RPM you won't see the HP numbers you're looking for till the motor is revved higher than you'd want in a street motor (700 hp at 7000 rpm ain't worth squat if it doesn't have the torque to pull away from a stop sign). Focus on torque - a 500 HP motor with 500 ft/lb of torque at 2000 rpm is a killer street motor.

Re: What kind of power can you get from a stroked 400 block [Re: Stanton] #1035219 07/19/11 06:21 PM 07/19/11 06:21 PM
Joined: Mar 2003 Posts: 1,629 Gambrills, Md M mopork top fuel
mopork top fuel M Joined: Mar 2003 Posts: 1,629 Gambrills, Md	What's a good cam recommendation for buku torque down low for a strictly street motor and that heavy car ?

Re: What kind of power can you get from a stroked 400 block [Re: mopork] #1035220 07/19/11 06:43 PM 07/19/11 06:43 PM
Joined: Oct 2005 Posts: 8,882 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,882 Ontario, Canada	Depends on your wallet ... hydraulic, solid or roller ????

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