Here's my deal. I have an '84 F150 completley stock with the Carter YFA 1bbl feedback carb, 3spd stick w/OD. It runs good and gets good mileage but... I want MORE POWER!

The biggest problem is I live in CA (smog testing) but the truck was not born here so my reqt's are not as bad as they could be. My next test is sked for next month and I don't have to do it again for 2 yrs (if I still live here at that time anyway).

I've been scouring the Clifford Performance site and I really want to do headers (53-2760), intake (43-4502-WH), and the 390cfm 4bbl Holley (08-8007) for starters.

My question is, what do I do with the sensors (inputs to/outputs from the computer) from the old carb i. e. Throttle Position Sensor, Idle Speed Control Motor, Choke heater and the Feedback Solenoid. I can't just leave the connectors dangling in the eng compartment. Plus, I'm sure it will run like crap and get terrible mileage since the computer will be all confused. Is there some value of resistor I could put in the lines to "fake out" the computer and give me decent performance/mileage?

Then there's the EGR valve and the O2 sensor. The CP catalog says the headers have smog (EGR Pipe) fittings and it probably wouldn't be too hard to to drill a hole and weld in a fitting to take the O2 sensor. What about the EGR plate where it hooks up to the intake under the carb. I'm assuming that won't fit either on the CP intake.

Anyone with experience on this would be greatly appreciated. Am I expecting too much? Should I just go with headers and skip the headaches involved with the carb/intake? Incidently, why would the 390cfm Holley cost $42 more than the 465cfm Holley? Thanks. Will

 

You should be able to remove all the sensors, as most of 'em only control the air/fuel mixture, and if you use a carb that isn't setup for 'em, you don't need em.
A header would be a great starting point as no aftermarket intakes are compatable with the stock exhaust manifold. I'd reccomend a Offenhauser dual port intake over the clifford, as it will give better mileage, and make more torque(that's what Hot Rod said back in 1979...)
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
Hedman dual exit Hedders
2" duals W/Cherry Bombs
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver

 

Thanks Evan. I agree that the F/B solenoid certainly the choke assist are probably not needed but what about things that feed back signals to the computer like the Idle Tracking switch and the TPS? Won't the computer go into "limp home" mode when it gets no signal from these sensors? I know it will store a code or 2 in memory. I'd like to stay smog legal if at all possible.
Does Offenhauser have a website? I can't find anything on them. Thanks again.

Will

 

I believe that offy was bought out. Don't remember by who - Holley maybe? Anyway JC Whitney shows these manifolds in their catalog so they might still have them in stock.
Can't help with connections - I have a 77.
The water heated clifford manifold works well with the later split cast iron exhausts - the manifold is a touch thicker but as long as your use the cast iron washers you are OK.
I put a holley 350 cfm 2 barrel on to pass emissions (450 cfm 4 bl would not even come close) here in Seattle. I suspect an edelbrock 500 cfm could be adjusted to pass - have not heard of anybody actually doing so.

 

Found 'em on the JC Whitney site. Much cheaper too! THanks. TOo bad about the Mariners. I hope the Mets kick the Yank's #$%^&!

Will

 

oh well - I was great just to have them get as far as they did. Almost as great a miracle as having the sun come out and the rain stop during winter!
Not sure if you will have this problem with the offy but if you get a holley and experience a bad bog off idle you will need the 50cc accel pump. I tried EVERYTHING else (accel cams,larger shooters) and this fixed it.
Another add on is a Blaster coil and multispark ignition (MSD 6A). Seat of the pants on the coil says it improves performance and many people are raving about the ignitions.

 

I am considering similar upgrades to my 300 in my '83 F-100. I also have emissions to consider since I live in Houston.

I thought about using the late model split exhaust manifold. Does that fit the older heads? I have heard that the intake has a different bolt pattern.

Thanks!

Darren

 

77 F150 4x4
I am running the newer split cast iron exhaust with a clifford water heated intake - exhaust fits fine. And runs fine. The intake is a touch thicker but not so much as to cause sealing problems. Not aware of changes in bolt patterns.
Does Houston have under hood inspections? Seattle does not - just sniffer. Would have been a problem otherwise!!!

 

Oh Ok. Yep, Houston does have smog inspections. What a pain! I dont think they are too picky on the old ones though. They didnt notice my aluminum Edelbrock for the ole 1 bbl. LOL

Darren

 

Where did you find a Holley intake for the I6? I went to their website and didn't see it. All I could find were tons of V-8 manifolds.

'84 F150
YFA F/B
SROD
"Ex" = Bone Stock

 

I don't think Offy. was bought out by anyone, and they have no website. The best price on the Offy manifold I can find is at www.jegs.com
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver