400 Horsepower
Elder User
Joined: Jan 2004
Posts: 867
Likes: 0
From: Eastern Pa
roller rockers
Walkee, Scorpion makes a set of roller rockers as does fms that will work on your pedestal type rockers (which all 351m and 400's have) with out any other modifications. They are the best deal in rockers.
Mountain Pass
Joined: Jan 2001
Posts: 227
Likes: 1
O.K.
Tastyklair, where can I get these Scorpion roller rocker arms
and can they beat the price of 195 bucks for a set of crane?
See, I`m living in Germany and my contacts are the big shops,
i.e. Summit, and I don´t even find the name Scorpion in their
catalogues.
Sanders, my planning is a overboring of 0.030" - match !
" ...you vehicle is going to be very cold natured "
Do you mean this is a very mild cam ?
Thanks, Tom
Tastyklair, where can I get these Scorpion roller rocker arms
and can they beat the price of 195 bucks for a set of crane?
See, I`m living in Germany and my contacts are the big shops,
i.e. Summit, and I don´t even find the name Scorpion in their
catalogues.
Sanders, my planning is a overboring of 0.030" - match !
" ...you vehicle is going to be very cold natured "
Do you mean this is a very mild cam ?
Thanks, Tom
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Sanders,
I ran some numbers. I figure your heads are 76.3cc's. the Torque is 386@3000 RPM and HP is 292@4500 RPM.
You desperately need headers, porting the exhaust side of the heads will help a lot as well. Your cam is starving at the RPM range where it should be making HP. That is because your exhaust flow is so poor.
Your compression is very high about 10.5:1. The cam helps keep the cylinder pressure low, but you must have some pinging.
I think that you have the essentials for a monster motor, just improve the exhaust flow. That will also improve your low end torque.
I ran some numbers. I figure your heads are 76.3cc's. the Torque is 386@3000 RPM and HP is 292@4500 RPM.
You desperately need headers, porting the exhaust side of the heads will help a lot as well. Your cam is starving at the RPM range where it should be making HP. That is because your exhaust flow is so poor.
Your compression is very high about 10.5:1. The cam helps keep the cylinder pressure low, but you must have some pinging.
I think that you have the essentials for a monster motor, just improve the exhaust flow. That will also improve your low end torque.
Senior User
Joined: Jan 2004
Posts: 299
Likes: 0
From: Illinois
Danlee,
I do have some pinging with the vaccum advance hooked up. If I leave it off I don't have any pinging. That alone is costing me power. The rearend gear is a 2.75 which I was told was lugging the motor causeing it to ping.
Unfortunately headers are not made for my application. I suppose I could make my own set. I didn't know my compression was that high. I was thinking I was around 9.2 to 1. Thanks for the input.
Walkee,
That cam is fairly mild but the valve overlap will cause a backfire through the intake when the motor is cold. It is best to use the choke and let it warm up for a couple of minutes.
Sanders
I do have some pinging with the vaccum advance hooked up. If I leave it off I don't have any pinging. That alone is costing me power. The rearend gear is a 2.75 which I was told was lugging the motor causeing it to ping.
Unfortunately headers are not made for my application. I suppose I could make my own set. I didn't know my compression was that high. I was thinking I was around 9.2 to 1. Thanks for the input.
Walkee,
That cam is fairly mild but the valve overlap will cause a backfire through the intake when the motor is cold. It is best to use the choke and let it warm up for a couple of minutes.
Sanders
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
You said that you have a zero decked block, flattop pistons and 0.010 milled off the heads. My calculations say 10.5:1 CR. That is OK with your cam IVC of 67 degrees, but on the edge.
I think that a cam with 282/292 duration should have more lift than yours, but it shouldn't cause any problem.
Look at Sanderson for shorty block hugging headers. They should fit almost any application.
I think that a cam with 282/292 duration should have more lift than yours, but it shouldn't cause any problem.
Look at Sanderson for shorty block hugging headers. They should fit almost any application.
Elder User
Joined: Jan 2004
Posts: 867
Likes: 0
From: Eastern Pa
Walkee
The Scorpions are often found on Ebay. The ones for the pedestals are usually about $20 more than the other ones. I think I paid $215. I have not seen a Crane that you don't have to use guide plates and hardened pushrods with. I think however that Comp cams makes a magnum rocker which is kinda like half a roller and will work with stock pushrods. I believe they are in Summits and Jegs.
Senior User
Joined: Jan 2004
Posts: 299
Likes: 0
From: Illinois
Hey Danlee,
Thanks for the input on the shorty headers. Sanderson said the could custom make me some. IT is gonna cost some cheese though. It got a set out of a bronco in a junk yard, I'm going to do a little fabricating and altering this week. I think I can eventually make the set I got work.
One more question do you think I might have been better off going with a milder cam?
A correction to a previous post, I said my block got zero decked by the machine shop. I checked the work oreder and it wasn't listed on there, and the guy didn't remenber doing it. I don't think it got done. I would have a hard time running pump gas on a 10.5 to 1 compression.
Thanks for your help.
Sanders
Thanks for the input on the shorty headers. Sanderson said the could custom make me some. IT is gonna cost some cheese though. It got a set out of a bronco in a junk yard, I'm going to do a little fabricating and altering this week. I think I can eventually make the set I got work.
One more question do you think I might have been better off going with a milder cam?
A correction to a previous post, I said my block got zero decked by the machine shop. I checked the work oreder and it wasn't listed on there, and the guy didn't remenber doing it. I don't think it got done. I would have a hard time running pump gas on a 10.5 to 1 compression.
Thanks for your help.
Sanders
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Your cam is OK. I think it could have more lift.
It all comes down to how do you want it to run? If you want a high torque low speed motor, you want a different cam. If you want a highway motor and are not towing heavy loads, you are OK.
I think that the headers will do wonders for your motor. Try them and see for yourself. The only other thing that I would suggest it porting the heads, especially the exhaust side.
It all comes down to how do you want it to run? If you want a high torque low speed motor, you want a different cam. If you want a highway motor and are not towing heavy loads, you are OK.
I think that the headers will do wonders for your motor. Try them and see for yourself. The only other thing that I would suggest it porting the heads, especially the exhaust side.
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Tuned
Joined: Jun 2001
Posts: 266
Likes: 0
400 motor
I am in the process of swapping in a 400 with flat top pistons (so 9.2-9.5:1?), 3 angle valve job, roller rockers, Streetmaster (single plane) intake, Road Demon 725, Hooker Super Comp ceramic headers dumping into dual 2.5" exhaust - will probably use Super Turbos. The cam is a Comp Cams XE262H (218/224, .513/.520, 110 degree). I also have an oil pan with windage tray/scraper and will use a straight up timing chain. I am aiming for about 375HP, but I am really after torque since it won't see a lot of RPM's...
Senior User
Joined: Feb 2004
Posts: 347
Likes: 1
From: Buffalo, New York
Hey danlee, I just took a look at your truck pics. WOW! I love that 400. I love seeing Ford truck with ford engines. At shows when I see a ford with a chevy engine I walk away from it. I don't understand what their thinking. I just wanted to give you major props foor your truck. I can't wait to find one. I'm searching now. Sorry for the off topic response. Carry-on!
Mountain Pass
Joined: Jan 2001
Posts: 227
Likes: 1
Sanders and Tastyklair,
thanks for your informations. The 400 has a edelbrock carb
1406 with electric choke and I go carefully after a cold start
and never had backfires so far.
So am I right to use just a standard head gasket and standart
pistons rings ?
One questions left : can I use my old heads bolts ?
You helped me a lot !!!!
thanks for your informations. The 400 has a edelbrock carb
1406 with electric choke and I go carefully after a cold start
and never had backfires so far.
So am I right to use just a standard head gasket and standart
pistons rings ?
One questions left : can I use my old heads bolts ?
You helped me a lot !!!!
Tuned
Joined: Jun 2001
Posts: 266
Likes: 0
Bolts
I recently read advice from a knowledgable engine builder saying that you should only re-use head/rod/cap bolts if you "know where they've been". In other words, if you originally bought them, know their rating, personally installed/torqued them, subsequently removed them and have 100% confidence that this was all done correctly and that they are good - then re-use them. Otherwise - if there is any sliver of doubt about their rating, how they were previously installed/removed, or their condition - then throw them away. This of course is the cautious view and some gearheads will say baaah - use em.
Posting Guru
Joined: Aug 2000
Posts: 2,416
Likes: 4
From: PacNW
Using new bolts is cheap insurance. However if I were on a really tight budget on a rebuild I wouldn't have any qualms about re-using the head and main bolts. I'd think twice about re-using the rod bolts since a failure there can result in almost instant, catastrophic destruction of the motor.
Senior User
Joined: Jan 2004
Posts: 299
Likes: 0
From: Illinois
I also would use a fel-pro head gasket, as far as pistons rings. If your budget allows it I would go with a little better than stock. You never know later on down the road you might want to spray it with NO2, and good rings will help in that situation.
Sanders
Sanders
Senior User
Joined: Jan 2002
Posts: 237
Likes: 0
So, let me toss out my 400 engine specs and maybe someone here can tell me how much estimated H.P. it's making? I don't have Desktop dyno, so i'm a begger
The engine has got maybe 300 miles on it since rebuild. My machinist told me he calculates 9.5:1 compression, but I do not know the cc's of the heads. 76cc comes to mind?
408 (400 bored .030)
Flat top Ertyl pistons
no head or block surfacing
2v Cleveland heads:
Comp Cams springs 940 (suggested for cam)
EGR bumps ground flush
exhaust guide risers ground flush
exhaust ported and polished
intake ported and casting flaws smoothed
3 angle valve seat grind
stock cast iron exhaust manifolds w/ dual exhaust
Performer 400 intake, port matched to heads
725 Road Demon Jr. carb
Comp Cams part #32-219-3 cam
Grind no. FC 260H-10
Gross lift int .480 ex .484
@.006= int 24btdc 56 abdc
exh 64 bbdc 16 atdc
duration @ .050 212 212
lobe lift .2795 .2795
This cam has a 4 deg advance built in, when timing gear are timed to zero advance.
Ford factory electronic ignition with stock coil
PS do those elapsed time thru 1/4 mile calculations work for horsepower? How accurate?
Thanks
The engine has got maybe 300 miles on it since rebuild. My machinist told me he calculates 9.5:1 compression, but I do not know the cc's of the heads. 76cc comes to mind?408 (400 bored .030)
Flat top Ertyl pistons
no head or block surfacing
2v Cleveland heads:
Comp Cams springs 940 (suggested for cam)
EGR bumps ground flush
exhaust guide risers ground flush
exhaust ported and polished
intake ported and casting flaws smoothed
3 angle valve seat grind
stock cast iron exhaust manifolds w/ dual exhaust
Performer 400 intake, port matched to heads
725 Road Demon Jr. carb
Comp Cams part #32-219-3 cam
Grind no. FC 260H-10
Gross lift int .480 ex .484
@.006= int 24btdc 56 abdc
exh 64 bbdc 16 atdc
duration @ .050 212 212
lobe lift .2795 .2795
This cam has a 4 deg advance built in, when timing gear are timed to zero advance.
Ford factory electronic ignition with stock coil
PS do those elapsed time thru 1/4 mile calculations work for horsepower? How accurate?
Thanks
Last edited by TomThrall; Mar 2, 2004 at 07:55 PM.