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Author Topic:   Boss 351 and HO intake manifold question
Daniel Jones
Gearhead

Posts: 495
From: St. Louis, MO
Registered: Aug 99

posted 01-18-2003 09:13 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
Are there guys racing who use the Ford spread bore aluminum 351C intake manifold as fitted to Boss 351's and 351C HO's? A guy in the club has one that has been polished and he wants to install a polished Edelbrock Performer instead. He wants to know what it's worth but I'm not sure who would be interested in buying it. Most of the hot rod types aren't interested because of the oddball 4300D spread bore pattern and the restoration types don't want it because it's polished. Any ideas on what it is worth and who might be interested? He can always fall back on Ebay but I thought I'd ask here first.

Thanks,
Dan Jones

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Mpcoluv
Gearhead

Posts: 945
From: Charlotte NC usa
Registered: Apr 2001

posted 01-19-2003 08:49 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
Doesn't the 4300D still have the holley bolt pattern with a weird venturi spacing?
Could the 4-hole plenum be milled out to 2 large holes and used for a square bore?

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 01-19-2003 09:03 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I'm pretty sure it does if it has the same carb as the one that came on the '73 4v motor. I had a '73 4v motor that had some strange factroy spreadbore carb on it that was pretty much junk. I unbolted it, and even though the venturi spacing wasny the same I used a Holley 3310 on it. I put a 1/2" open spacer under it and it worked a lot better than the factory carb did, even with the bad alignment. And it did bolt right up.

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 01-19-2003 09:05 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I'm pretty sure it does if it has the same carb as the one that came on the '73 4v motor. I had a '73 4v motor that had some strange factroy spreadbore carb on it that was pretty much junk. I unbolted it, and even though the venturi spacing wasny the same I used a Holley 3310 on it. I put a 1/2" open spacer under it and it worked a lot better than the factory carb did, even with the bad alignment. And it did bolt right up.

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Daniel Jones
Gearhead

Posts: 495
From: St. Louis, MO
Registered: Aug 99

posted 01-19-2003 04:59 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
Yes, the 4300D has a Holley/AFB/Autolite bolt pattern with a spread bore hole pattern that is different from that of the Quadrajet or ThermoQuad. The Pantera had a 4300D on it when I got it. Pony carbs rates them at 715 CFM though I think some of the period magazine articles listed it at 750 CFM. It worked very well with the stock CJ cam though I would guess the selection of jets and power valves is limited should you run a non-stock cam. When I installed the Aussie heads and Weiand intake, I sold the carb to guy who mounted it on a Holley Street Dominator intake. Both of the Holley 351C intakes have trapezoidal plenum openis that directly mount a 4300D but not a Qjet or TQ.

Dan Jones

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fastbackRb
Journeyman

Posts: 79
From: Columbus,Ga.
Registered: May 2002

posted 01-21-2003 10:20 PM     Click Here to See the Profile for fastbackRb   Click Here to Email fastbackRb     Edit/Delete Message   Reply w/Quote
Daniel I sold the one I had at the swap meet 2 years ago hor $300 to aguy that took it to car.pa. tothe swap meet and he got $750 for it. Hope that helps.

Rudy

------------------
70 fastback cleveland 5.80'[email protected] with a 4 speed lenco (broke it)
69 cougar elimnator Boss 302
84 droptop 5.0
86 hatchback 289
92 explorer
97 f350 dullie power stroke

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 01-26-2003 12:52 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Back when we were young, we once installed one of those intakes on a 351 2V with a 3310 780 Holley.
The car was a 71 Mach with headers, a C-6 and 3.25 gears.
We went from 15.70's to 14.70's with no other changes.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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Daniel Jones
Gearhead

Posts: 495
From: St. Louis, MO
Registered: Aug 99

posted 01-27-2003 01:07 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
> Daniel I sold the one I had at the swap meet 2 years ago hor $300 to a
> guy that took it to the car. pa. swap meet and he got $750 for it.
> Hope that helps.

Thanks for the input, Rudy.


> Back when we were young, we once installed one of those intakes on
> a 351 2V with a 3310 780 Holley. The car was a 71 Mach with headers,
> a C-6 and 3.25 gears. We went from 15.70's to 14.70's with no other
> changes.

Wow, that much better even with the port mismatch.

Dan Jones

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 01-27-2003 01:11 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes Dan, much better. We had similar experiances with big block chebbies too!
Big valve canted cylinder heads just don't like two barrels or small runners.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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