Ford 390 cam and modification help needed!
I bought a 1971 F100 with a 390, C6 and N/A rear end ratio. Seems to be somewhere in the low to mid 3`s. Tires are street tires 265/60-15.
It has a Holley 2v carb that flows 280cfm and points
stock iron intake
Engine seems all stock with stock manifolds.
I`ll be using this truck around town, a few trips here and there, moving lightweight stuff around. I wan`t more power and double the mpg
Cruising steady 50mph I`m at 9 mpg.
It`ll break the tires loose from start at half pedal, and giving it full it stops pulling around 3500rpm (I don`t have a tach).
I`m blaming this on the tiny weenie carb, and wan`t to change it out to a q-jet on a performer rpm intake. While the intake is off I also wan`t to change out the cam. So I wan`t some ideas on which cam to choose. I`d like to keep as much of the valvetrain as possible. I won` t be turning any rpm`s, max around 5000rpm.
I`d like to buy:
Used q-jet on evilbay, rebuild it and thune with apt mixture screw
Buying an rpm intake (using adapter to spread bore)
adequate cam (need advise for a stomp puller with great fuel economy, low end torque and can hang on to 5000 rpm)
I`m thinking somewhere around 210/215-220 @ 0.50, maximum lift of what the stock valvetrain can handle, 110 lsa.
What is the most lift I can run with stock valvetrain ?
Is there any chance my heads and cr are ok for performance around 300hp and 400 ft/lbs ? I`m thinking I have around 200hp as it is now, with GREAT idle and low end performance.
Where can I find numbers on the heads to find out if they are any good.
The engine is OLD and rusty, but doesn`t have any noise to it, doesn`t use oil and runs smooth. So I`m going to try and up the power a bit.
Also curious about my cr ratio, won`t be changing pistons as that is too much work without doing a complete overhaul. Milling the heads is a possibility, but not sure if I will gain much without doing a full port job on the heads, and that is a little more work than what I`m willing to put into this project.
Also looking for a set of full lenght headers, but willing to use the manifolds until I find a good deal locally.
Am I on the right track with this ?