I have a 1982 f100 with a 302. Last week I did the gt-40 head swap and a new performer intake. My problem is that anytime I'm past half way throttle it Boggs down and is very jerky. It feels like the air to gas ratio is off but whenever it is parked I can rev it to 6k and it is smooth the whole time no studder no hesitation nothing. But when I hop in and 1 st is okay up till about 3500 rpm then it bogs and 2nd is good till about 2000 and 3rd and 4th are just about useless.

My timing is off? What is the symptoms of a bad timing ? I didn't remove the distributor

I really need anyone's help I'm going back to college on Friday and I am stumped and really don't want to have to leave my truck hear at home.


I have tried it with both a Edie 1406 and a motorcraft 2bbl and the problem is still there. Maybe not as bad with the 2bbl but still there.

 

Just some guesses:

Weak fuel pump?

Clogged fuel filter?

Accelerator pump not working?

 

I thought of the filter so I just took it off but the same issue is there. Last week whenever I took it apart the fuel pump was working and the filter when it was on it was always chalk full. And I don't think it's a carb problem because I tried it with the 2100 and the same problem was. There.

 

Anyone else got any suggestions ? What would a bad ignition module or ignition coil be like ? I'm running out of ideas

 

Have you tried driving with a vacuum gauge attached so you can see at what vacuum level the bog occurs? How much vacuum is it pulling at idle?

Bogs are usually caused by a lean condition. Check the tuning manual for the Edelbrock and get a couple of sets of rods that will run richer.

 

I'm going to buy a guage tonight and will find out. My battery died while starting it today so I will find out later. Thanks that is a good idea.

 

I thought about the rods but isn't a 1406 a little on the heavy side already for a 302.

 

Edelbrock carb generally run well out of the box because they're a bit on the rich side but every carb and engine is different.

 

I would bet you've got timing/ignition problems here since you did nothing with that part of the engine. Do a complete tuneup (plugs, wires, cap rotor) check the timing with a light should be around 10-14* BTC for best operation also check the vacuum advance to see if its functioning, limited advance will cause a problem such as you describe

 

It was the valves (I think) well I charged the battery at orieleys and it backfired a few times and was slow but once it started it came to life. I let it idle and idled it up and down and then let it sit for 10minutes and then jumped in it to see what happens. So the last thing I did before I started it this time was to snug down all the valves while it was running and so when I hoped in it and it actually drove like a normal car. I got 1st to probably 5000 rpms and second to 4500. In the neighborhood .......... Tomorrow while it's daylight I'm going to drive it around town and then she'll go on the highway later in the day. Hopefully (figures crossed)

Your not suppose to be able to adjust these pedestal rockers but I guess being my first engine build Ill blame it on that and I can't think of anything else it could be.

 

There is no adjustment with pedestal rockers, torque em down to 25 ft/lbs and you're done.

 

Then maybe it was a vacume leak under the carb ? And just taking it off and putting it on fixed it ?

 

And what if someone torqued them down to 35 lbs. what would happen ?

 

Probably nothing. Those are pretty tough bolts. Probably a grade 8. 10 extra ft/lbs I doubt will stress them enough to pop. What kind of torque wrench did you use ?

 

A vacuum leak would have been a constant problem, from idle on up.