Well I finally get to dyno the truck on Sat, first with my trusty (but still a huge pile of salty crap) 2bbl, then on comes the 4bbl, so I will finally get the real truth on switching between the two. I have a Holley 600 that I will run, but Im also going to throw an Edel 750 on too just for kicks. I'd love to hear thoughts, comments, and predictions!! Im shooting for 220 at the wheels with the 2bbl, hopefully 250 with the 4.

1970 F250 Sport Custom
NP435 and Dana 24 T-Case
390 w/flattops
stock rebuilt heads
Comp 268H
S-code iron intake
hedders w/ 2.5" exhaust
and extra washer fluid

 

I bet the extra washer fluid puts you closer to 280HP :-)

I'm glad to see somebody else getting a Dyno. yours resembles many of the 390 builds in this forum, so the numbers will be good to see.

mines running better than ever. If I can get the transmission under control, I'll go to the dyno. I'm hoping for 400hp/450lb-ft torque at the rear wheels through a C6. i'm probably a little optimistic. But, it posted 360/416 before and I know it's running better.

 

I think all 4 guesses are optomistic!

 

well, do you have any numbers to contribute?

 

you almost got me there! But as a matter of fact I do. Assuming he has about 265hp with a 2bbl and 299hp with a 4bbl. I think with it tuned properly 205 and 235 rwhp. I wouldn't be surprised if it was a shade less than this even. As for the extra fluid I came up with 205 and 235 rwhp once again.

Now, I don't know what you have upgraded that you plan on 40 more rwhp. In my high tech calculations thats about 60 more hp at the motor and that doesn't happen by adding or draining any fluid.

 

my motor was poorly tuned, with a bad throttle linkage and a smaller carb, and I had not degreed the cam upon installation as I have this last time, and it posted the 360 RWHP. It might post the same number, but I'd be surprised. the truck is faster than ever before, posting it's fastest MPH at the track recently. I'm no guru, but I believe the MPH and HP are closely related. And, there's more room for tuning! If it doesn't improve some, I'll probably blame the transmission for extra slipping.

keep in mind, I've probably got $10-12k invested in this motor. It's not the typical FE build.

As for pkulaga's numbers. you're probably close. he does have the advantage of the manual transmission.

I would just like to see some more real RWHP numbers instead of all this Desktop Dyno speculation. That's why I asked if you had numbers! I was hoping you had some real dyno numbers...

 

greg, I am sorry for being a jackas$ in my last post! I am a poor sob and I have no dyno numbers, and i know people are tired of hearing about desktop dyno numbers and head flow figures, and i am tired of people thinking they have an extra 100 or 200 hp. Before all this computer dyno crap it was how much do you I got? 450hp of course with that 600cfm carb, weiand intake, and shortie headers. And as a side note i wouldn't put a edel performer intake on any motor ever. The smaller runners have increased velocity, wow.

I am aware that pkulaga has a manual and they are said the lose 15-18%. I added a couple more for the tranfer case though.

I have to agree that hp and mph are related, and that motors such as ours have big potential and are tempermental and might not ever run the same twice. I didn't remember hearing about any upgrades or substanial tuning. I have been hiding under a rock that last year as so though.

 

I didn't think you were being a jacka$$ :-) Like I said. I thought maybe you had some rear wheel dyno numbers. I'm like you, tired of seeing the huge dream numbers. but, I've got a little basis for mine. I mean, 396hp would just be a 10% improvement from my last dyno. And , a lot has changed.

but like you said, these custom motors can be tempermental, especially when asembled by an amatuer like me :-)

right now, I'm more worried about lubricating a dyno with my tranny problem... :-) (must park in grass)

 

I meant your motor but we all tend to modify or our fe's. I recommend performance automatic if you are interested in a new tranny, i don't have personal experience with them though. lol I have heard good stuff about them and they have a new warranty.

 

well to add some numbers for ya.. i know this isn't an FE engine but i recently had my 460 rebuilt and dynoed and by recently i mean around... january. it has 9.6:1 compression. mildly ported and polished factory heads with roller rockers. speed pro oversized pistons. if i remember right.. it has a 262H 4x4 comp cam.. i drive it daily so i don't want the thing lopin' like there's no tomorrow. gear drive so all the "import tuners" can hear me comin'. stock rods and crank with arp hardware. block was decked, bored .030 over, and align honed. had it all balanced. it has heddman elite truck hedders on it with the stock 2 1/4 dual exhaust because i ran out of money when it came time to put it in my truck. edelbrock performer intake with a 1" open spacer and a 1" 4 hole spacer with an 850 demon carb on top with k&n filter. msd box and wires with a msd pro billet distributor. ok i think that's enough of that for now. but anyway. when i had it on the dyno and after we broke it in on it, a few runs were made and after some carb ajustments such as SMALLER jets because the carb was set up a bit rich out of the box it knocked out 427hp and 510lb.ft. of torque. which i guess isn't all that bad considering the cam and other things. i had someone do a desk top dyno "guess" on this about a couple months before i actually had it dynoed and what they came up with was 400hp and 525ft.lb. of torque so i guess that was pretty darn close. i'm sure it's running a little less than that at the moment though because of my exhaust set up for one thing, we had 3 inch exhaust and some turbos on the dyno instead of my 2 1/4 and 30" glass packs. but with the engine set up like that, with 26 inch tires (very small I know) and a stock transmisson and rear end (3.25) I managed a 14.9 quarter mile time at the track. I had my truck weighed at a scale and it weighed in at 4500 lbs. with me in it so that's how much it weighed at the track. i don't know if that's any good, but i know i was goin a lot faster than most trucks i mess with on the streets. now if only i could get a 4.11 posi, some taller fatter tires, and steal the 6 speed from my brothers 94 camaro >.> but just out of curiousity.. does anyone know what these numbers would be at the wheels? i was guessin maybe 300? i really don't have too much of a clue, but the guy that built my engine races a lot and he said a fair guess is to take of a good 25% of your hp and considering he drives a 4.6 second car i'm willing to heed that. by the way.. has anyone ever seen a 1300hp engine make a dyno run? holy crap! it lifted the engine dyno off the ground from all that torque. slammed right back down when he let off. must have been up like 6 inches for half the run.... i gotta stop typing, i think that'll do me for the year.

 

hey 75bigblock, fairly nice buildup except for the performer. I like the weiand stealth 8012 nonegr, 8021 egr over the edlbrocks including the rpm. It has more power potential. I spent considerable coming up with a build for a buddy of mine that should have very similar numbers and I am considering the same cam I think.(34-235-4). 25%-30% should be about right for drivetrain loss. So expect about 300-320hp peak and 357-382 tq peak.

 

well i recommend a set up like mine if you plan on towing anything. my truck isn't something most people would want to tow with, but i think it could tow anything i'd ever need to. it's a 75 f-150 single cab 2 wheel drive. it came stock with this 460 even though most people think i swapped it out of a licoln or somethin. it's like.. check the vin on the door.. yes.. it matches the frame, i checked when the engine was out. i guess it's rare cause it's a single cab, most other f-150's i see with a 460 are extended cab or anything else. but anyway, i moved from twin falls idaho to salt lake city utah sometime in march. i had all my belongings in the bed, including a car dolly hooked to the bumper hitch and NOT a reciever hitch which most people frown upon, but *shrugs* do what ya gotta do. and on that dolly was my 4 door 1965 dodge coronet 440 with even more of my stuff inside and the trunk fully loaded. i don't know how much all that stuff weighed but i'd say that car weighs more than my truck by at least 500 pounds and i had to have had a least another 1000 worth of stuff in the truck of that car and in the bed of my truck and don't forget two gas tanks full of fuel. and it pulled that all very easy and my truck wasn't leveled out or anything. i never had to floor it goin up the mountain passes and i was even passing people. i'll just say i'm rather pleased with my ford now i just need to figure out what to do with this other one i just bought last week... 77 f-150 4x4. god that 351m is so weak compared to this 460. my boss has an '83 390 he says i can get if i want it. would that be a good engine for that truck? and what kind of power do 390's have stock? probably better than a 351m 2bbl. i don't know what all this truck has on it as i'm new to 4x4's.. but it does have 35's on it and a 4 inch lift already. who knows what else has been modified

 

well that extra washer fluid did help . Posted 210 RWH and 373 RWQ. Weather turned crappy and there was just too much beer to drink so I was unable to get the new intake and carb on there, but as soon as I do I will get back to DynoJet and see if the number improve the way I want them too. Im deffinately happy with 210, especially when I think about how much time and money I put into the engine (which was not alot).


Pk

 

Sounds goood.that's a nice torque number. If you get a graph, post it in your gallery for us!

 

That sounds about right, for a 2 barrel, unported heads, and a small cam. I'm going to guess the 4 barrel will get you to about 240 RWHP. I predict there will be exactly 2 horsepower difference between the Holley 600 and the 750.