1970 f100

jb65542 · #1 (**permalink**) 05-11-2008, 06:38 PM

hi, i have a 1970 f100 4x4 with a 302 out of a 96 ford explorer and have a zf transmission behind it. i was wondering what the best way to add power to the motor. it is an all stock motor still fuel injected. thanks for any info

rhetor · #2 (**permalink**) 05-11-2008, 07:37 PM

best way to add power is heads.

jb65542 · #3 (**permalink**) 05-11-2008, 09:07 PM

what heads do you recommend. i already have gt40 that was stock with the explorer.

rhetor · #4 (**permalink**) 05-12-2008, 06:06 AM

well, I guess we should take a step back.

What rear end gears do you have, and what are your RPMs at cruise on the highway?

How much are you looking to spend, and how much more power do you want?

jb65542 · #5 (**permalink**) 05-12-2008, 06:03 PM

i have 3.55 gears in it and it runs 1900 rpms at 65. i just want it to keep speed when i go up a hill.

jowilker · #6 (**permalink**) 05-13-2008, 06:04 AM

The engine may be running under it's power band. The simplest thing to try would be to go to a 3.75 rear gear.

Don't forget to change your speedo gear to keep speedo on target when changing ratios. Usually a change like 3.5 to 3.75 will be one tooth difference.

John

rhetor · #7 (**permalink**) 05-14-2008, 08:00 PM

I would agree. Changing to a higher ratio rear end would help you out a lot.

Long tube headers would help with low end power, but in the north east where i'm from, they rust real quick. They are also loud in the cab and i hate them.

Dave Severson · #8 (**permalink**) 05-14-2008, 08:04 PM

Procharger blower!!!! Great power and excellent driveability.

jb65542 · #9 (**permalink**) 05-15-2008, 08:46 PM

what rpm would i be running if i changed to 3.75 gears and are there any bolt on part that would help any at all

jowilker · #10 (**permalink**) 05-16-2008, 05:08 AM

Check this site out * * Automotive Programs by Bowling & Grippo * *
Once you have your knowns you should be able to get your answer.

If your truck has a 9" rear it is just a matter of swapping the center section.

John

qman · #11 (**permalink**) 05-16-2008, 11:15 AM

What is it about new heads that would add power? How much different is it from changing from 2bbl to 4bbl carb?

mcdobson · #12 (**permalink**) 05-16-2008, 11:25 AM

Be careful with the fuel injection. Any time you start changing things with EFI you run the risk of having the ECM not functioning properly. Check with the 5.0 EFI boys on the engine forum, they may have some advise for you.
Good luck.