nice try though.......
must be them damn desktopdyno's.............
400 Horsepower
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Junior User
Joined: Nov 2003
Posts: 58
Likes: 0
From: saint petersburg,florida
m440 Horsepower
I have installed a 400 crank and.060 over pistons in my 351m with a Weiand dual plane manifold and a Edelbrock 750 carb.---a comp cam 484/518 lift.---
Does anyone know the aprox. horsepower with these changes?
EDIT:
Whoops, I'm just not doing things right today.
The cam lift is .510--.526. Duration at .050 is
Intake 211 and exhaust is 223.
Thanks,Seneca
Does anyone know the aprox. horsepower with these changes?
EDIT:
Whoops, I'm just not doing things right today.
The cam lift is .510--.526. Duration at .050 is
Intake 211 and exhaust is 223.
Thanks,Seneca
Senior User
Joined: Mar 2003
Posts: 248
Likes: 1
From: Ottawa, KS
Actually, stock 400's varied in HP ratings every year. Most were around 170 though. Just a guess, but I'd bet you are on the healthy side of 250, that's fairly conservative. What condition is the motor in, and what's the mileage on it? For good information, you can check out Bubba's M-Block page. It's an excellent source of information.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
A stock 400 with 170 HP is a choked up smog motor. By going from a 2V to a 750 CFM 4V, add headers and a free flowing intake and a cam with 211/223 duration @0.050 and 300 + HP is possible.
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Senior User
Joined: Oct 2003
Posts: 195
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From: OxFord Wisc
so your saying 150+ from cam intake and headers.......lol
I have built plentyof 351m/400's, and yes a simple timing chain change can wake them up, but 150 horse, i'd have to see that for myself on a dyno.........
I have built plentyof 351m/400's, and yes a simple timing chain change can wake them up, but 150 horse, i'd have to see that for myself on a dyno.........
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
That's cam, intake, headers, and carb(750 CFM).
I've had 2V 289's with 200 HP. I've had 351C-4V's with 300 HP. Getting 300 ponies from a 400 cu inch engine isn't hard.
Just remember this is at the flywheel, not the drive wheels.
Read the HOT Rod magazine article, that should be in the archives here.
I've had 2V 289's with 200 HP. I've had 351C-4V's with 300 HP. Getting 300 ponies from a 400 cu inch engine isn't hard.
Just remember this is at the flywheel, not the drive wheels.
Read the HOT Rod magazine article, that should be in the archives here.
Senior User
Joined: Jan 2004
Posts: 299
Likes: 0
From: Illinois
Hey Danlee,
Think you could do me a favor and run these numbers through the desk top dyno.
408cid
282/292 cam
flat top pistons
600 cfm Edelbrock carb
Edelbrock preformer intake
dual straight pipes with the stock manifold
zero decked block
milled heads .010
MSD blaster coil
I built this engine about six months ago but never got it on a dyno. Feel real strong but I'm just wondering if anyone has a ball park figure. Thanks
Sanders
Think you could do me a favor and run these numbers through the desk top dyno.
408cid
282/292 cam
flat top pistons
600 cfm Edelbrock carb
Edelbrock preformer intake
dual straight pipes with the stock manifold
zero decked block
milled heads .010
MSD blaster coil
I built this engine about six months ago but never got it on a dyno. Feel real strong but I'm just wondering if anyone has a ball park figure. Thanks
Sanders
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Buzz,
I wouldn't build that engine that way. The 750 Carb is overkill, but that was the spec he gave me.
Sanders,
I'll run the figures, but give me the CC's for the heads. Also I need the cam lift or the make/model.
I wouldn't build that engine that way. The 750 Carb is overkill, but that was the spec he gave me.
Sanders,
I'll run the figures, but give me the CC's for the heads. Also I need the cam lift or the make/model.
Senior User
Joined: Jan 2004
Posts: 299
Likes: 0
From: Illinois
Danlee,
Here is the cam specs:
Adv. Duration: 282°/292°
Duration @ .050'': 204°/214°
Gross Lift: .280''/.295''
Lobe Seps. 112°
The heads stock are around 78 CC's and I milled them down a bit so I'm going to say the heads might have a 77cc combustion chamber.
The block and the heads are 78 351M car motor.
Thanks
Here is the cam specs:
Adv. Duration: 282°/292°
Duration @ .050'': 204°/214°
Gross Lift: .280''/.295''
Lobe Seps. 112°
The heads stock are around 78 CC's and I milled them down a bit so I'm going to say the heads might have a 77cc combustion chamber.
The block and the heads are 78 351M car motor.
Thanks
Mountain Pass
Joined: Jan 2001
Posts: 227
Likes: 1
Hey Sanders,
the statements to your engine nearly match to the stage I
want to come with my 400.
It already fitted with edelbrock cam, carb and performer intake
together with dual pipes and flowmaster muffler, stock manifold.
Because of a piston rings blow-by I need to do something.
I`m planning a 0.015" head milling, a set of badger flat top
pistons, a set of edelbrock valve springs and a set of roller rocker
arms.
Maybe you ( or anybody here ) can give me some advice what I
have to watch for.
Can I use my "old" pistonrods, do I need a special head gasket
or special piston rings ?
What is the difference between "pedestal" and "rail" rocker arms ?
Thanks for your help !
the statements to your engine nearly match to the stage I
want to come with my 400.
It already fitted with edelbrock cam, carb and performer intake
together with dual pipes and flowmaster muffler, stock manifold.
Because of a piston rings blow-by I need to do something.
I`m planning a 0.015" head milling, a set of badger flat top
pistons, a set of edelbrock valve springs and a set of roller rocker
arms.
Maybe you ( or anybody here ) can give me some advice what I
have to watch for.
Can I use my "old" pistonrods, do I need a special head gasket
or special piston rings ?
What is the difference between "pedestal" and "rail" rocker arms ?
Thanks for your help !
Senior User
Joined: Jan 2004
Posts: 299
Likes: 0
From: Illinois
Tom,
The best way to clear up piston blow by, would probably be boring your cylinder walls out .030. On a 400 it would give you a 408 and it really tightens your motor up.
I used remanufactured connecting rods when I built my motor. My old connecting rods were probably fine but you never know.
If you are using the Edelbrock 2172 cam, you vehicle is going to be very cold natured.
Can't help you with the rocker arm question.
Good luck,
Sanders
The best way to clear up piston blow by, would probably be boring your cylinder walls out .030. On a 400 it would give you a 408 and it really tightens your motor up.
I used remanufactured connecting rods when I built my motor. My old connecting rods were probably fine but you never know.
If you are using the Edelbrock 2172 cam, you vehicle is going to be very cold natured.
Can't help you with the rocker arm question.
Good luck,
Sanders