Power?
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Postmaster
Joined: Jan 2003
Posts: 3,775
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From: Conway Arkansas
Power?
What power am I making?
Heres the info I know
390 .30 Over
8.5:1 compression pistons
Stock 4 Barrel Cast Iron Manifold
C8AE-H heads
750 Holley Carb
1 7/8 Full Lenth Headers w/ 3inch collectors and dual 2 1/2 inch pipe into dual 40 series flowmasters w/ 3 inch dumps
Crane # 343901 Cam
(COPIED STRAIGHT FROM CAM CARD)
LIFT: INTAKE @CAM 2847 @VALVE 501 ROCKER ARM RATIO
EXHAUST @CAM 3027 @VALVE 533 1.76
CAM TIMING OPENS CLOSES ADV DURATION
@ .004 INTAKE 19 BTDC 61 ABDC 260 °
TAPPET LIFT EXHAUST 69 BBDC 23 ATDC 272
CAM TIMING OPENS CLOSES MAX LIFT DURATION
@ .050 INTAKE (5) ATDC 29 ABDC 107 °ATDC 204 °
TAPPET LIFT EXHAUST 45 BBDC (9) BTDC 117 °BTDC 216
Anything else you need to know... I can try and answer it
The cam... I posted from the cam card, so if you need more let me know
Heres the info I know
390 .30 Over
8.5:1 compression pistons
Stock 4 Barrel Cast Iron Manifold
C8AE-H heads
750 Holley Carb
1 7/8 Full Lenth Headers w/ 3inch collectors and dual 2 1/2 inch pipe into dual 40 series flowmasters w/ 3 inch dumps
Crane # 343901 Cam
(COPIED STRAIGHT FROM CAM CARD)
LIFT: INTAKE @CAM 2847 @VALVE 501 ROCKER ARM RATIO
EXHAUST @CAM 3027 @VALVE 533 1.76
CAM TIMING OPENS CLOSES ADV DURATION
@ .004 INTAKE 19 BTDC 61 ABDC 260 °
TAPPET LIFT EXHAUST 69 BBDC 23 ATDC 272
CAM TIMING OPENS CLOSES MAX LIFT DURATION
@ .050 INTAKE (5) ATDC 29 ABDC 107 °ATDC 204 °
TAPPET LIFT EXHAUST 45 BBDC (9) BTDC 117 °BTDC 216
Anything else you need to know... I can try and answer it
The cam... I posted from the cam card, so if you need more let me know
Senior User
Joined: Jun 2003
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well, i'm sure there's some individuals in here who have dyno'd a similar combo and or will run that through a desk top dyno and give you a more reliable answer, but just for the heck of it, i'm gonna take a stab in the dark and guess '' REAL WORLD " about 370 horses, assuming the heads are stock.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Guess what? I just bought Dyno 2003. I think it is much more accurate. This was done with actual flow data from the C8AE-H heads with no porting. The advertised and .050 lift is taken into account with the new version. Here you go!
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Joined: Jun 2003
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thats interesting.......i figured since most 390's were rated at around 315 stock 4 bbl at 4600 or so that a larger carb, some headers, and a cam would add more, especially if you figured it out at around 5250 rpm or any rpm higher than the 4600 ish range ford used...........then again some of those engines were 9.5 ish compression.........so i may have been a little high in my estimate but id still think it good for 340 or 350 horses........hmmmmmmmmmmmmmmmmmmmmm....whats really interesting is you almost dont care about horse power when you see the torque on that gragh!!!
is that graph backwards or am i looking at it wrong?? it looks like it's starting at 8000 rpm instead of ending???, or is it just look like that because the graph isnt wide enough to show where its climbing in the lower rpm range??
i'll have to invest in one of those desk top dyno's some time they look like they'd be pretty usefull...........how do they calculate intake manifolds on a given combo??
is that graph backwards or am i looking at it wrong?? it looks like it's starting at 8000 rpm instead of ending???, or is it just look like that because the graph isnt wide enough to show where its climbing in the lower rpm range??
i'll have to invest in one of those desk top dyno's some time they look like they'd be pretty usefull...........how do they calculate intake manifolds on a given combo??
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
The new version is available for a trial download from http://www.motionsoftware.com . You can't change the bore or stroke. The program does not calculate for power below 2000 and Andy's torque peak probably starts lower than that. The 315HP 390s had bigger cams and higher compression than Andy is building. His engine should last for a very long time and have perfect street manners. All of this and he is still making just shy of 300HP. I doubt it makes any more.
Last edited by Ratsmoker; Nov 8, 2003 at 04:51 AM.
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Postmaster
Joined: Jan 2003
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From: Conway Arkansas
Thanks Ratsmoker... I appreciate it... I know it makes the torque, cuz its a tire frier... I doubt it makes over 300 hp either, but I dont care... after I change to aluminum intake I'll pick up a bit.
THen im going to go to town on a stroker motor
THen im going to go to town on a stroker motor
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Postmaster
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From: Conway Arkansas
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Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Nah, I wish there were. I am guessing about 15 more ft.lbs before it starts to drop off. It would be cool to see if you are really making that much low end on a dyno. A 300HP 390 peaking at 1500rpm for torque? You are starting to give me ideas for my tow truck motor I am going to build Andy. I bet your gas mileage is going to be impressive for an FE.
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Thread Starter
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Postmaster
Joined: Jan 2003
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From: Conway Arkansas
Ha... gas mileage so far sucks...
But I prob havent put 5 miles on it...
Drove it around the block
I put 5 gallons in it... and I let it run in the driveway a bit and drove it to work and back (1 mile each way) and around the block and that was it
Of course, the tank was bone dry also..
Im sure I make close to that power, because its a torquey little thing.
I'll let you know, as its going on a dyno when I get a chance in LIttle Rock ARkansas
So that has something to do with it
But I prob havent put 5 miles on it...
Drove it around the block
I put 5 gallons in it... and I let it run in the driveway a bit and drove it to work and back (1 mile each way) and around the block and that was it
Of course, the tank was bone dry also..
Im sure I make close to that power, because its a torquey little thing.
I'll let you know, as its going on a dyno when I get a chance in LIttle Rock ARkansas
So that has something to do with it
Senior User
Joined: Nov 2003
Posts: 495
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From: WA
I just put my 74 F-250 4X4 on the dyno. My motor is a 390 bored .30 over with an RV cam (don't no the figures off hand) about 8.5:1 compression with an edelbrock intake and a 770 street avenger holley 4bbl. The engine is fairly new and has stock exhaust manifolds and pertronix ignition. The dyno said I was making 188 HP @ 5500 Rpm and 260 Ft-lbs of torque at 3400 Rpm at the rear wheels. It was estimated that the engine was producing about 250 Hp at the flywheel. I plan on adding headers and edelbrock heads in the near future.
What do you think the Hp will be with the additional add ons?
What do you think the Hp will be with the additional add ons?
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
I think your cam is too big highboy. You are short on torque and making your peak HP at a very high RPM for an RV cam and stock manifolds. You should grab another 50 - 75HP with the edel heads and headers. What are your cam specs? You have a bad mismatch somewhere. The C6 is said to eat about 25% of your flywheel HP. This depends on the converter too. I think there is plenty of potential in your engine with the stock heads yet. The edel heads will lower your compression even more. You would gain power but loose a good deal of efficiency.
Senior User
Joined: Nov 2003
Posts: 495
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From: WA
The truck has a T-18 4spd. And by the way I found the cam specs. Its an elgin pro stock E966P
cam lift Int=.280 Exh=.295
Valve lift Int=.484 Exh=.510
Lobe Centers Int=107 Exh=117
Adv. Duration Int=270 Exh=280
.050 Duration Int=204 Exh=214
This info was printed right on the side of the box.
cam lift Int=.280 Exh=.295
Valve lift Int=.484 Exh=.510
Lobe Centers Int=107 Exh=117
Adv. Duration Int=270 Exh=280
.050 Duration Int=204 Exh=214
This info was printed right on the side of the box.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
That cam is a little big. The reason I say this is the advertised duration numbers are pretty big for a torque cam. The .050 numbers and lift are pretty small. This tells me that the cam has a very slow ramp rate. I'll see what desktop dyno says.