Hi, I'm fairly new to this stuff so please excuse my ignorance, I just picked up a 70 f100 swb it had a old 390, I pulled it and found it needed a rebuild, so as I work in town I wanted to build a fun truck to drive back and forth to work, as I live in and work in town gas mileage ain't a concern, and I was wanting some feed back from yall fe experts on whether this will be a fun setup, 390 punched .30 over, kb hyper pistons, 10:2.1 compression, d2teaa heads milled .30 edelbrock performer rpm intake, 750 double pumper thumpr cam
2000-5800rpm 226/241 @.50 515/501 lift 107 lsa, electronic ignition, long tube headers, 3 inch exhaust with flowmaster 2 chambers turned down under the cab, as far as numbers go I was predicting around 380hp 400lb ft, I may be wrong but I'm not to concerned with numbers and
As for the truck itself its sporting a 4.11 gear set, c6 trans and a 2500 converter

 

with the compression and the cam i'd say 380 ish would be about right. on milling your heads make sure not to go to far or you'll have to mill the intake and make the dizzy fit. if i recall correctly the D2 heads are the "smog" heads. i'm still young and dumb and need to learn more about FE's myself.

 

truckguy933 Welcome to nand the FE Forum.

You don't want to be driving that setup. You will need racing fuel for that compression, and will be pissing a lot of it on the ground with that carb. With the direction that fuels are going in, don't know how happy you will be with your decision 8-10 years from now. You will have to have shooters hearing protection with all the drone sound in the cab.

Sounds like a nice track build but not a driver. My 2 pitched in.


John

 

Since you're kinda new to this hobby, you might want to spend some time finding a builder who specializes in FE engines. There are a few real good ones around the US who provide tons of excellent advice and will likely save you time and money by getting you on track to a satisfying build. They can do all of the work, a portion of it, or you can do it all yourself. I recommend you buy your parts from whoever you find and consider their advice based on years of experience a great advantage to you and well worth the little extra you may pay one of them.

 

That compression isn't a huge deal on pump gas.

Of course if you are new to the hobby, your tuning skills might make it a big deal. Aim for a little less compression to be safe. I'd say something with a point less compression should be easier to manage.

That cam is for exhaust sound, it isn't really a great performance cam, it's just meant to sound like one :P

I'd be looking for something more in the 212-218 @.050 for a spirited street 390. Those gears and convertor will help some as well.

As far as a carb, double pumpers in a heavy vehicle (like a truck) aren't the best choice. Currently the best deal going for a new carburetor is the Quickfuel slayer.

Good luck
Drew

 

Thank you guys for the help, I'm wanting to change the carb to a 700cfm vacuum personally, and im sorry i forgot to be more in-detail gas to me is of no concern, ill drive this truck maybe 13 miles a week, and the engine was already built the only things it needs is a carb on top, and i ain't taking it to the track or anything but before I brake the motor In with the parts it has I was wanting some expert advice on whether it would stick me in my seat or not"

 

I decided either go with the thumpr, howards 235/235, xe274, but I did not think the stock rockers would handle the lift of the other two

 

I was confused.... I thought you said the engine needed rebuilt, I understand now, you have an engine already built to put in the truck.

I'd just run it and see how ya feel about it since it is already together. At least then you'll know what you'd like to change.
stock rockers are pretty tough, at worst you just get endstands and studs.

Here is the real issue with the build.
With the cams you've selected, the engine will outright be a dog unless you are pushing it hard.
It'll feel great at 5000rpms and really pull hard. But driving the ten miles to work will most likely suck.

Easy fix is a smaller cam with less overlap, etc. Problem is that you have compression that is kinda on the ragged edge of detonation with those D2 heads. Adding a smaller cam will make the truck considerably less pump gas tolerant.

Drew

 

You are right, and again sorry for the unclarity of the post, the rough idle of the cam meaning its running inefficient at low rpm, hence why I went with the 4.11 gears to go along with it, and it said the range was 2000-5800rpm so I chose to run a 2500 torque converter, but when gas gets high thats why I have my PriusXD

 

If yall don't mind I would like to express my theory as to why I used the parts I did so maybe yall could help me further into understanding where I went wrong but I'm completely willing a to change some minor parts if I need to,
I started with how I wanted to drive it well I wanted to have something that I could drive to work every few days, fry the tires, loud with a deep rumble and a good chop, so I veiwed s few options and went thumpr I heard compression determines how loud it is, and low end torque, I was goin for 10:0.1 but ended up with 10:2.1 so the thumpr worked from 2000-5800 well driving 35-55mph 4.11 gears and a 3 speed I'd always be in the power band, then the edelbrock performer rpm 1500-6500rpm, a 2500 stall to flash mid way into the cams power band from dead stops, so I saw 2000 and up cam, 2500stall mid range intake and high revving lower gears, so in my eyes it all seemed to all match up together

 

It'll be fine, just stuff it in there and try it out.

 

Will do thanks for your guys help

 

10.2:1 compression with that cam should be fine on 93 octane.

I ran .554 lift and pretty stiff springs with stock rockers, and while it was a bit much, it held together up to 6000RPM, and it saw that a lot

Also, I was at around 11:1 with a 230/230@.050 - it took a bit to tune the advance correctly, but in the end it was just fine.

 

Question, on this mechanical carb it has a link bar to the secondary jets, if I pulled that link bar out, to run only the front two and richen the mixture a little bit, would that work as a 2 bbl carb?

 

That's pretty cool if I would have known that I would have went with the xe274 cam, but again I dont think these d2 heads probably stop flowing after 520 lift