Offy and 65 head.

[jamerson84]

I've got a 65 mustang with a 200 and I just want to make sure that the Offy tripower conversion kit is going to bolt up to my C5 head. the head also has a hexagonal shaped log. I'm pretty sure that I'll be able to use the kit like CobraSix used but I just want to make sure.
I plan on using the three autolites since I already have one from pony carbs. If I use cheaper autolite carbs for the outer too would this cause a problem because I don't have the money to buy to more from pony carbs.
thanks for the info.

 

[Junk-Falcon]

go to the local pick n pull n get a newer head n work with that ,,, its way way easer to have a 2nd , ya just have ta pull n replace when all ready , or ya do all the work when the lower block is all open n sittin wattin for the head to be finshed , ,, the offy is made 2 ways that i know of , you just need to know the biglog of a newer head or the smaller one , like it sounds like you have "now"

 

[CobraSix]

As junk was saying, Offy makes two intake adaptors. One for heads before 69 and one for heads after 69.

Personally, the size of the intake log will make no difference with the Offy intake set up. The advantage of the later heads (69+) is I believe the intake and exhaust valves are larger. I don't have my falcon book with me right now so I may be mistaken.

Having a 2nd head is probably the best way to go to minimize down time. Doing the work will take a good honest week of work depending on what else you do to it. I polished my exhaust ports and installed new springs, and reground the valves at the same time.

Also...word of advice...buy the kit from complete, not from ebay. I bought mine from a dealer (good dealer) but it was an incomplete kit. I ended up spending about an hour in NAPA fitting bolts for the various linkages until I got the right sizes and lengths.

With the Autolites, you will have to remove the choke from the outer carbs. It is cheaper to but the automatic choke carbs and remove the whole choke assembly (including the choke plate) then to buy a manual choke carb. Just be sure to plug the vacuum hole that runs into the choke mechanism. You will also not be able to run the stock filter on the front of the carbs...not enough room. You'll need to buy an inline filter for the fuel hose. It is also fine to run Pony Carb on the center and 2 cheapys on the outer. That is actually what I was going to do until my Pony Carb decided it needed a good rebuild, so temporarily I'm running 3 cheapys while I rebuild the Pony Carb.

With a 65 Mustang, the kit will probably not come with the correct linkage to connect to your gas pedal push rod (I'm unsure of the name...its the rod that runs from the firewall to the engine for the accelerator). This isn't a big deal. All you will need is some Aluminum flat stock (any hardware store has it) and you can fabricate the right piece with a hammer and hacksaw. I'll be post pictures of my final set up once I get everything running correctly.

Slade

 

[CobraSix]

For the record, I am using a C8 (68 ) head.

Slade

 

[CobraSix]

If you are certain about going with autolites, some of the Offy kit will not work for you...specifically the throttle return springs for the carbs. I will soon have pictures of a set up that works just as well, is nice and clean, and can be obtained from just about any ACE or TruValue hardward store.

Slade

 

[jamerson84]

Hey thanks for the replys they cleared up alot.
I guess as long as I find a head 69 and older head my autolite carb should still fit it.
Thanks again for the help.

 

[Anonymous]

Don't worry too much about the throttle return spring, I was able to use a set up very similar to the stock one.

I have a couple of autolites lying around, they are not in good shape, but could be used as cores, the Holly I pulled off my car before installing the webers ran just fine and would work as a center carb.

Bill

 

[CobraSix]

Only thing with the holley that I would be concerned with it hood clearance. I barely had enough hood clearance running the Autolites, and Holley's are taller. The 65's have smaller hood clearance then the 66+ mustangs. I had to recess my air cleaner on top of my carbs and cut the air filter in half to have enough room. My total height from the top of the carb (not the air cleaner nut hole) to the top of my air cleaner is around 1", and that only gives me about 1/4" clearance on the front carb.

Slade

 

[Anonymous]

yeah good point I had not even thought about it. The Webers are not that tall, but i have had some hood clearence issues as well.

Bill

 

[CoupeBoy]

I snapped these when I ran into Colorado66 at a local carshow, click on them and it will open a much higher resolution (350K) image.






-ron

 

[Anonymous]

i see in the pic the same coil i use , a mallory,,, but with resitor ????
before i blowing some electric stuf . i got the same mallory coil with dura ll setup and msd6a box ! in an issue i read remove the resitor from the mallory coil when using the dura ll setup . , i,m right ???? with ore without resitor instal the dura ll????
some one give some tips ore info about this item ? thx !

 

[CobraSix]

Coupe,

Thanks for the pictures. IIRC, Bill has a 67 mustang right? THey have more hood clearance on the front of the engine bay then the 65s do. The Autolites are the lowest profile carbs I could find and barely have enough clearance.

Slade

 

[Anonymous]

66, when installing the coil and the matching Mallory Distributor, it said to use the resistor. I have not had any problems with it. I am not sure what you would do with your setup.

It is actually a 66 stang, a real dirty one whne I ran into Coupeboy as amatter of fact, smile.

Bill

 

[Anonymous]

thx for the info , i did thougt i read somewhere to use without resitor, i will look into it , not that i,m blowing some electric stuf ! it whas verry hard to get these parts , did cost me 2 years to get them ,would be not funny when i,m blowing them ,for some stupid artikel that i did read some where!
btw ..the dirty part can be cleaned , next time give the photo man a cleaning set , make a deal!!!!! , want a pic ? firts clean the engine bay ! 8) btw -i love the setup,, verry good looking and i hope for you also good running,,keep up the info for doing things and howto ! whe need that , thats why whe are the greatets inline forum

 

[Anonymous]

Harrie, that resistor is to suppress RF interferance. Unless you enjoy AM radio, its safe to leave it off

BTW, the Mustang is coming along well

 

[Anonymous]

66, thanks for the kind words. When the car was my daily driver, I "accidnetly" jumped it over some railroad tracks and it threw the battery into the fan, shearing off a corner of the battery and spraying battery acid every. Including my clothes when I opened up the hood to check and see what it was running so rough.

I have been real happy wiht how much better it runs. What a seat of the pants difference it makes! I had to put a tch on the steering collum because it revs so damn fast I worried about blowing something up. I still have a couple of fine tuning bits to get done, but for the most I am finsihed with it.

If anyone has any questions, I would be happy to answer them.

Bill

 

[CobraSix]

I can't get my engine to idle below 1500 RPM...but I'm still working on the tuning, I think there are other problems.

Slade

 

[Anonymous]

Slade,

Does it just die if you get below 1500 RPM's. Or is it just really rough?

 

[CobraSix]

To get it to run below 1500RPM, it has to be retarded to the point that the car back fires when it dies and won't start back up until I re-advance the timing.

I don't think it has anything to do with the Offy set up, because it does the same even if I remove the outer carbs are replace them with a flat flange. My fuel pedal is set right, but I'll double check that.

Slade

 

[Anonymous]

hmm thats odd. I woudl start with the easiest fixes first. I am sure you have checked the carb and made sure it is working properly. What kind of ignition set up are you running? It does not sound like it could be a vacuum issue, as they are usually more apparent at higher RPMS. It still kinda sounds electrical to me.

make sure the butterfly on the carb is not getting caught up in the offy anywhere or the gasket. Is your car in a heated garage or anything, or is it cold when you are starting it?

Bill