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Old 03-23-2011, 12:33 AM   #1
synthartist69
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Default 347 carb question 65 mustang

Well I have decided to go with a 347 stroker motor for my 65 fastback. I am wanting to get opinions on which model number and Holley carb I should use on it. I have a 650 but I am being told that it won't be enough. This is a daily driver street racer. Here is my set up....

347 block
Pro Comp Heads
Ford racing E303 cam
Performer RPM intake
Hipo K code exhaust manifolds
Top loader 4 speed
3.00 rear end
Pro Comp electronic distributor
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Old 03-23-2011, 02:46 AM   #2
67mustang302
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You probably want better heads and a cam. Those heads are known to have some major quality/reliability issues, and that cam is outdated for a 302, and downright wheezy on a 347.

As for a carb, 750cfm 4150 style. Annular boosters would be nice. Depending on the cam heads, a 347 could need anything from a 650 to a 950 or 1050.
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Old 03-23-2011, 09:45 AM   #3
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Quote:
Originally Posted by synthartist69 View Post
Well I have decided to go with a 347 stroker motor for my 65 fastback. I am wanting to get opinions on which model number and Holley carb I should use on it. I have a 650 but I am being told that it won't be enough. This is a daily driver street racer. Here is my set up....

347 block
Pro Comp Heads
Ford racing E303 cam
Performer RPM intake
Hipo K code exhaust manifolds
Top loader 4 speed
3.00 rear end
Pro Comp electronic distributor
Have you bought these items yet?
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Old 03-23-2011, 09:57 AM   #4
synthartist69
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I have not bought anything yet.

Let me say first. The builder has had great success with the pro comp heads. He assembles the heads himself. He has sold a lot of 347's and has excellent customer satisfaction. I feel very confident in going with the pro comp heads since he is putting them together with his choice of valves, springs, etc.

I am wanting a cam and carb to maximize this set up for street and highway racing....not going to the drag strip. I want a cam that has a noticable to light medium idle, similar to a comp 268H and NO MORE...What are your suggestions? Thanks!

4 speed with 3.00 rear end
Hipo manifolds....WILL NOT BE USING HEADERS
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Old 03-23-2011, 10:05 AM   #5
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I have not bought anything yet.

Let me say first. The builder has had great success with the pro comp heads. He assembles the heads himself. He has sold a lot of 347's and has excellent customer satisfaction. I feel very confident in going with the pro comp heads since he is putting them together with his choice of valves, springs, etc.

I am wanting a cam and carb to maximize this set up for street and highway racing....not going to the drag strip. I want a cam that has a noticable to light medium idle, similar to a comp 268H and NO MORE...What are your suggestions? Thanks!

4 speed with 3.00 rear end
Hipo manifolds....WILL NOT BE USING HEADERS
Oh and I would rather pull hard from 3000 to 6000 than starting pulling at 1500 just to avoid too much tire spin.
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Old 03-23-2011, 11:19 AM   #6
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Originally Posted by 67mustang302 View Post
You probably want better heads and a cam. Those heads are known to have some major quality/reliability issues, and that cam is outdated for a 302, and downright wheezy on a 347.

As for a carb, 750cfm 4150 style. Annular boosters would be nice. Depending on the cam heads, a 347 could need anything from a 650 to a 950 or 1050.
+1.....It really won't matter much though if you insist on running HiPo manifolds..They will be a major restriction...
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Old 03-23-2011, 11:36 AM   #7
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+1.....It really won't matter much though if you insist on running HiPo manifolds..They will be a major restriction...
They are a restriction over headers, but I have had some fast cars that didn't have headers.
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Old 03-23-2011, 11:52 AM   #8
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Hipo manifolds might as well be a cork on a built up 347. Seriously, those things will probably cost you 40-50hp at least.

For a cam, just get a custom grind. You'll have power where you want it, with drivability, idle etc. Money well spent. Though on a 347 you're going to have wheel spin on street tires, period.

As for the heads, the problem isn't who assembles them. The problem is the Pro Comp heads are low quality control castings from China. It's quite common for them to develop leaks through port walls, cracks etc. Some people are lucky and get a set that are fine, some people get them and end up with a car that won't even run.

And just FYI, if you're going to ignore us and go with the hipo manifolds, then save your money on a 347 kit. A 347 with hipo manifolds, a weak cam and crappy heads won't make any more power than a 302 with the same parts. No sense in getting a stroker kit if you're not going to benefit from it.
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Old 03-23-2011, 12:01 PM   #9
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sounds like your going about your build the wrong way.No headers and you want a powerband from 3000-6000 to avoid tire spin? Do you understnd what kind of intake and cam makes power int that range?

Nothing wrong with Pro Comp heads as long as they are not used out of the box.I have them on mine, but they are totally reworked and CNC'd.
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Old 03-23-2011, 12:01 PM   #10
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Quote:
Originally Posted by 67mustang302 View Post

As for the heads, the problem isn't who assembles them. The problem is the Pro Comp heads are low quality control castings from China. It's quite common for them to develop leaks through port walls, cracks etc. Some people are lucky and get a set that are fine, some people get them and end up with a car that won't even run.
Where are all these unhappy people (who didn't use the assembled parts)?? In general, I hate Chinese junk more than most, but very few who actually OWN the heads are griping. It's always someone passing on info. The complaints seem to be in cheap assembly parts which don't apply here. Got any firsthand info to share?
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Old 03-23-2011, 12:01 PM
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