I worked up some numbers off of my "Dyno 2000" program and thought everyone might find them interesting...

I had to use the Chrysler slant 6 as the base platform since the program only shows V-6's for Ford, C***, AMC, etc.
I then plugged in all the bore/stroke, valve sizes, etc. from the 300 ci Ford to come up with my results. I tried nine different cams and was supprised to see that a milder cam was only down 3-4 HP but had 25-30 more ft. lbs. of torque which EVERY truck/4X4 needs. I also tried to keep in mind that the average guy would not want to spin his 6 much higher than 5000-5,500 RPM

The best cam was a Crane #204451 it has an advertised duration of 272-284 degrees with .530" intake and .560" exhaust. Power range is 2,000-5,000 RPM. With stock valve sizes, stoke bore/stroke, headers through the mufflers and a 400 CFM 4 bbl. the engine made a peak of 226 HP @ 4,500 RPM and torgue was fairly flat from 2,000-3500 RPM at around 305 ft. lbs.

The next thing I did was increase the intake valves from 1.78 to 1.94" and the exhaust went from 1.56 up to 1.60. This change alone increased the peak HP to 240 HP @ 4500 and the torque went up all along the RPM range with the biggest gains from 3500 RPM and up...it also extended the RPM range by 500 RPM...stock valves were signing off at 5500 RPM (187 HP) while the large valves were still breathing at 5500 RPM (209 HP).

For those of you who want more bottom end I then tried advancing the cam 4 degrees...advancing the cam shifts the power range down about a 500 RPM drop, HP dropped about 4 HP as an average but torque was up to 315 ft. lbs (average of 6 ft. lb. gain) from 2000-3500 RPM.

O.K. guys, we are now back to large valves, with the cam running straight up but with an open header and a 500 CFM 4 bbl...Power jumped to 251 HP @4,500 and 329 ft.lbs torque @ 2500 RPM.

Next we assumed you took the time to pocket port the intake and exhaust ports, the power took another leap...this time to 302 HP @ 5500 and max torque of 339 @ 3500-4000 RPM

Last but not least, I then dropped the compression to 8:1 and threw caution to the wind by dropping a Weiand 142 blower on the engine with maximum boost set at 10 lbs...power went to 344 HP @
5500 RPM and torque peaked at 372 ft. lbs @ 3500 RPM.

Things to think about: I tried 5 different carb sizes...your best bet is to stick to a 390-500 CFM 4 bbl
Making your head flow is where it's at...pocket porting and bigger valves.
Bigger cams are NOT better unless you intend on MAJOR port work and want to spin you engine into the stratosphere.
There is always nitrous...

Good wrenching...Deen


Deen Hylton
Ford F250 460 C-6, K&N, Headers, Dual Exh.,Comp. Cams,Shift Kit
Pioneer CD w/Bose Speakers.
Other Passion: Blown 77 Corvette (Sorry Guys/Gals)
How I can afford to Drive the above: 93 GEO Metro

 

Hey thanks for this write up on HP and Torque. I'll have to save this for latter modifications!!!!!


1994 Ford F150
300-6
Highly Modified and more to come!

 

I need to get another copy of that program....my EX-girlfriend threw mine away. It's just to fun to sit around and play with. :P

TrailDawg
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
4.9L-Auto
Pro-Comp Stage-2 6" lift
Auburn Pro-Series Diff. w/4.30:1 gears
35x12.50x15 General Grabber MT's
http://www.geocities.com/ProjectTrailDawg

 

How about plugging my donk into that program? 300HD bored .030 over, 66 240 head, sbc 1.94/1.60 valves, 9.5:1 cr, fairly heavy port job, Clifford 270H cam, 110 degree lobe center .478 intake & exh., 270 degrees duration, .299 lift & 214 degrees duration at .050. It is fed by a MAF EFI setup with 19#/HR injectors, and adjustable fuel pressure. If you need more info, I'll see what I can give ya.
Evan MacDonald
82 F100 FlareSide ex. 2wd
MAF MPFI HD 300-6
Hedman Hedder
NP435(6.69 low)
NP205
3.55 Geared ARB'd 9"
Dana 44 TTB
31x10.50/15 Goodyear M/T's

 

>How about plugging my donk into
>that program? 300HD bored .030
>over, 66 240 head, sbc
>1.94/1.60 valves, 9.5:1 cr, fairly
>heavy port job, Clifford 270H
>cam, 110 degree lobe center
>.478 intake & exh., 270
>degrees duration, .299 lift &
>214 degrees duration at .050.
>It is fed by a
>MAF EFI setup with 19#/HR
>injectors, and adjustable fuel pressure.
>If you need more info,
>I'll see what I can
>give ya.
>Evan MacDonald
>82 F100 FlareSide ex. 2wd
>MAF MPFI HD 300-6
>Hedman Hedder
>NP435(6.69 low)
>NP205
>3.55 Geared ARB'd 9"
>Dana 44 TTB
>31x10.50/15 Goodyear M/T's

Evan, I would need ALL the information listed on the cam card such as...degrees @ BTDC, ABDC, BBDC, and ATDC, etc.
Also what's the flow rating in CFM of your injection and what type of manifold (single-plane?, dual-plane?, tuned-port?).
As far as using a "240 head" there is no way of computing what differance that would make on the engine other than what you can give me on correct compression ratio or the air flow data off of a cylinder head air flow tester.

Deen Hylton
Ford F250 460 C-6, K&N, Headers, Dual Exh.,Comp. Cams,Shift Kit
Pioneer CD w/Bose Speakers.
Other Passion: Blown 77 Corvette (Sorry Guys/Gals)
How I can afford to Drive the above: 93 GEO Metro

 

Ok, head numbers are 226 cfm on the intake and 182 exhaust @ .500, specs from the cam card are as follows, @.050, exh opens @37 bbdc, closes @ 3 btdc, intake opens @ 3 atdc, closes at 37 abdc, .299 lift, 241 degrees duration, 110 degree lobe center, advertized specs are .478", and 270 degree duration. Intake is the stock 300 EFI setup, which, according to the October 86 Popular Mechanics(back whan the EFI 300 was new...)is tuned port,
what it flows, I'm not sure, but, 415CFM sticks in my head, I might have it flow benched. Compression is 9.5:1. I might also go with an Offy dual port manifold with an Edelbrock 500 cfm carb. The cam is not yet installed, so advancing or retarding it is an option. Horsepower isn't as important as Torque to me, and, due to the fact it has a forged crank and only about 2000 miles, I'm not scared to bring it up to 6000 rpm, but, I'd like the power much lower than that.
Evan MacDonald
82 F100 FlareSide ex. 2wd
MAF MPFI HD 300-6
Hedman Hedder
NP435(6.69 low)
NP205
3.55 Geared ARB'd 9"
Dana 44 TTB
31x10.50/15 Goodyear M/T's

 

D'oh, that should be 214 degrees duration at .050
Evan MacDonald
82 F100 FlareSide ex. 2wd
MAF MPFI HD 300-6
Hedman Hedder
NP435(6.69 low)
NP205
3.55 Geared ARB'd 9"
Dana 44 TTB
31x10.50/15 Goodyear M/T's

 

Evan, the dyno program says cam information is not as accurate at .050 but I think we should be with in 10+- HP, anyway this is what I came up with:

I assumed you had headers...with mufflers on, I came up with 226 HP @ 4,500 RPM, 311 Torque @ 2,000-2,500 RPM. No mufflers 234 HP
330 Torque.

With a dual plane and a 500 CFM carb your HP stayed the same but you LOST 11 ft. lbs. of torque.

Next I ran the numbers with the Crane # 204541 cam that was so outstanding in the tests listed in the above posts. I plugged all your numbers in with the tuned port injection and mufflers back on: 268 HP @ 5000 RPM, 323 ft. lbs. average torque from 2500-4000
RPM. Going to the dual plane and 500 CFM carb increased HP by 2 but DECREASED torque by 5 ft. lbs.

Open header with the crane cam and factory tuned port came out to
281 HP @ 5000RPM and 340 ft. lb. torque.


Deen Hylton
Ford F250 460 C-6, K&N, Headers, Dual Exh.,Comp. Cams,Shift Kit
Pioneer CD w/Bose Speakers.
Other Passion: Blown 77 Corvette (Sorry Guys/Gals)
How I can afford to Drive the above: 93 GEO Metro

 

Well, if I had of bought the cam, I was going to get a Crane, but, I got the 270H on a trade with Eddie. But, that is more power than I expected, I didn't expect to break 210. Yes, I am running headers, Hedman dual collector long tube equal legnth ones, as for mufflers, my exhaust system currently doesn't extend past the collectors... Now to add the head and cam to the engine and transform it into a 220 odd horse beast :-)
Evan MacDonald
82 F100 FlareSide ex. 2wd
MAF MPFI HD 300-6
Hedman Hedder
NP435(6.69 low)
NP205
3.55 Geared ARB'd 9"
Dana 44 TTB
31x10.50/15 Goodyear M/T's

 

Just some FYI: I discovered long ago when using the DesktopDyno program, that it isn't that accurate. Also, remember that the figures are at the flywheel, not the rear wheels.

What it is good for though is being used to see roughly what kind of improvements certain components will make individually.

TrailDawg
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
6" Lift w/35's
And STILL waiting to get my 4.30 gears installed!!!!
http://www.geocities.com/ProjectTrailDawg