715 cfm Holley Carb

Anything to do with shelby is way overpriced due to rarity of some of the original parts.

 

True that anything Shelby nowadays is overpriced, that's why it makes sense to buy the most complete car possible. The 715 was a better unit than the standard HiPo Carb <Center pivot kept it from starving in turns, as I recall>
Another tidbit - I was told that the Holly engineers completed the design just weeks before they started production of the first batch of 110 cars. The date code on # 17 is among the earliest I have seen. When I picked the car up, Howard asked me to read him that date code after we verified the Ford # under the tag.

Mike

 

THese guys have the bowls and the carbs.http://www.carlsfordparts.com/main.html

Jon

 

You could do that. Le Mans fuel bowls are around $250 to $300 for the pair.
And don't forget the fuel transfer tube. It's only going on a clone, right?
shlby66

 

Keep your eyes open, and be patient. They're not always $900. Check this one out (it's already ended, but for under $200).

http://cgi.ebay.com/ebaymotors/ws/e...STRK:MEDW:IT&viewitem=&item=110151979109&rd=1

I recently got a new condition one for $350.

Good luck,
John Thomas

 

The right carb rebuilding kit is $65.00.

 

Since you are building a clone I suggest that you fond on of the replacement 715 (look the same but the date is normally 1969 on the air horn) Not cheap but allot less.

Just a thought

 

Hi Jerry,
Please note that the 3259 has a #85 power valve so you must
make sure your engine produces more than 10 inches of mercury
at idle as measured by a vacuum meter. The original street
GT350 had 15 as a minimum. My 65 is running about 16-16.5.
Many hot cams give you a very low idle vacuum.
Also, if I don't recall wrong the R-models used the 3255 Holley
which was the same as used on the 427 Cobra. Experts here,
please correct me if I am wrong. 3255 had larger venturis and
was rated at 780cfm.
Texas Swede

 

I had Pony Carbs rebuild a 715 cfm Holley for the original 289 in my 67 GT350. The engine had had the heads ported and a pretty large (10" vacuum at 950) cam in it.

I was very, very disappointed with the low end throttle response. The big carb with the big cam on a small motor was a bad combo.

Believe it or not I ended up putting a 500 cfm Edelbrock (yes, 500) on it and the difference was night and day. Would pull 4th gear at 1500 rpm no problem. Ran out of breath at 5500 but the motor was tired and I didn't rev it any more than that.

IMO on a 289 the 715 might make more power above 5000 than say a 600 cfm carb but if you run the 715 you are going to give up something on the lower end.

Now I have a 347 with a 750 which works great.

 

I'm certainly no expert on R-Models but I have read that they did (maybe some?) have a different cam. I would email Howard Pardee or Craig Conley with any R-Model questions, they are the experts.

 

I have a Comp 270S (Mechanical Flat Tappet, Advertised Duration 270/270, Lift .499/.499) in my 289 with factory heads.

Maybe it was just dumb luck, but when I switched from my Edelbrock 1406 to the Holley 3259, it was like driving a new car. It is much faster now. The Edelbrock was in good tune, too. It ran good before, but now it is really fast.

I know most people will argue the 715 cfm is too much carb for a 289, but it really works for me. I don't know what the folks at Shelby's logic was back in the day, but apparently it worked for them, too.

John Thomas

 

This is from a 289 HD Race engine

Cam - Sullivan ( so likely a custom grind)
Type - Flat tappet
Duration - Intake....296 Exhaust.....296
Lift - Intake....510 Exhaust.....515
Timing - Lash .025
Exhaust Opening - 76 BTDC Exhaust Close - 40 ATDC
TDC - 139
Intake Opening - 41 BTDC Intake Close - 75 ATDC

Heads - Ported by Valley Head service with Dual coil Isky springs and Shelby aluminum retainers and milled by Hydro Head
Intake valve - 1.875 Exhaust - 1.625

Machine work calls for "welding and milling heads"
Port manifold
Port and polish cylinder heads
Balance crank assembly
Degree damper

Carb - Holley
Jetting Main- Pri - 66
Idle - Sec 13

Spark Plugs
Autolite BF601

Ignition - Dual point
Initial advance - 12 degrees
Total advance - 38 degrees

Dyno Sheets show

1st run
Torque - 276
Corrected HP - 380
@7200 RPM
Peak torque @5500 RPM (318)

2nd run
Torque - 290
Corrected HP - 400
@7200 RPM
Peak torque @5500 RPM (323)

Hope this helps

Jeff

 

You should be able to get a custom grind if that I what you want. Not sure if I've included all the info needed. .... if not, let me know and I'll see if there is something else I can find

 

I have a copy of an original engineering sheet on the 3259 from Holley. The date on it is December 4, 1964.

 

I would love to have a copy of that!
What is the date code on your carb <if original>

Mike

SFM 5 017