View Full Version : Any suggestion to get more power out of old motor?

01-09-2011, 11:45 PM
OK I知 just about done with the lift on my 79 GMC Jimmy. I知 thinking in need to do something to the motor. I think it is the original motor. I知 thinking about putting a new intake and rv cam any suggestions? Not wanting a race truck just a little bit more power to push the 35s inch tires.

01-10-2011, 12:21 AM
First and foremost ...make sure it's tuned right …carb, timing and vacuum. Next - new filters (air, fuel) New plugs, wire, cap, rotor, distributer wouldn’t hurt either. Run some sea foam in it….clean the bitch out.

After that – I would leave it alone. It you still want more – probably headers (if you don’t have them) would be best bang for buck.

Biggs Chevys
01-10-2011, 01:52 AM
yes making sure the engine is in good tune is a priority... but you also need to consider your gear ratio, what is it?

01-10-2011, 02:12 AM
Check out the Edelbrock 'power packs,' they come with carb,cam, intake and lifters that all are matched.

01-10-2011, 02:30 AM
X2 on the gear ratio, if you've got 3.07's or something, with 35's it will be a dog!

tune up as described above, probably original wires...everything.

01-10-2011, 02:50 AM
Is there a way to tell my gear ratio with out pulling my punkin and counting the gears?

01-10-2011, 02:57 AM
Sometimes, if you're lucky, there's a tab under one of the rear cover bolts that will say it. Some have it on the glove box door, and if you've got the window sticker, it should have it, (this is all assuming that it's stock, and hasn't been touched).

01-10-2011, 03:14 AM
you dont have to count anything. you can pull the diff cover off, and spin the ring gear until you find the numbers stamped in it. theres 2 numbers that will be divided to get your ratio. (ex. 41/11= 3.729 or 3.73)

chances are you need to change your fluid anyway.. :smokin:

01-11-2011, 04:07 AM
HEI distributor, Electric fan, headers w/ good exhaust... that is of course after a good tune up and carb adjustment/ cleanining.

01-11-2011, 04:15 AM
yes making sure the engine is in good tune is a priority... but you also need to consider your gear ratio, what is it?
X2 What Biggs said

01-15-2011, 03:45 AM
Don't know how deep you want to go but a great upgrade is a set of heads that has smaller combustion chambers. They'll effectively raise the compression of your motor and get you some ponies you've been missing out on. Look for some vortec heads off of a newer motor. You could probably get a set used in good shape for less than you would think...maybe a couple hundred bucks.