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Author Topic: 347, stock H/C/I enjoy!  (Read 49948 times)
jayh
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« Reply #150 on: August 09, 2010, 04:42:55 pm »

I think its desktop dyno   

seems pretty accurate to me, I dont know maybe a stroker would lose 30hp 
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jayh
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« Reply #151 on: August 12, 2010, 09:46:12 am »

from-   http://forums.corral.net/forums/showpost.php?p=9993665&postcount=3

(Buddy Rawls)
If the heads are separated then you can always simply bump the casting numbers against the ford documentation ("how to build the SBF" book has a great cross reference)

Anyway, the early 351W casting that was used up thru 74 model year is the C9 and D0 castings. These are the 351W heads that have been touted as the desirable bolt on thru the years (prior to the aftermarket taking over).
They have 140cc intake runners with the 1.84/1.54 valves. The DEAD GIVEAWAY VISUAL I.D. on these heads is the 'L' shaped water passages. The heads used an extra intake manifold in each corner, requiring a weird water passage mod. They have 18mm spark plugs. Note, these are not special 351W heads, these are simply the 351W head production head thru '74. Found in mustangs, LTD's, galaxies, etc etc and mercury counterparts. Some guys will say a 4 barrel head was different. It wasn't. The 4V 351W motor simply used a flat top piston.

The '75 351W (D5TE-only) is actually the better casting, but was never touted as the best head because in 'stock' bolt-on form it was not as good as the C9/D0 head. They have small 289/302 valves, however the intake runner volume/design was the same as the C9/D0 casting. The beauty with this is that their is more meat in the valve bowl area to really work the short turn radius if 1.84/1.54's are added or 1.9/1.6 etc. This is the best casting to use as a base head for ported and modified 351W head. they are 14mm spark plug heads. and the water passages are conventional 289/302/E- design. IDing these heads will have to be a visual on the casting number which is typically on the combustion face in one of the casting recesses towards the intake side right near the pushrod holes towards the end of the head. Although if compared next to a conventional 125cc casting, you can see the slightly wider intake port width. These are 1975 year fitment heads, and possibly some 1976 only. The odds of finding a set now days is pretty rare.


Any other 351W besides the C9, D0, and D5 are simply a regular 125cc head just the same as the 302's and 5.0L's.

The benefits of the 351W heads are increased inlet crossectional area and valve sizes over the E- heads. In comparison to the GT40 heads, they are quite similar. However, the 351W chamber is smaller than the GT40 head, a good thing!

For the 289 heads. The earlier, the better. All the heads will have the 125cc style intake passage (like the 302's and E- heads). Valve sizes on the '65 and later heads is 1.78/1.46. The desirable bolt-on heads are the '65 and '66 castings. They will have the 54cc small chamber that is pinched around the spark plug. the DEAD GIVEAWAY will the be pushrod slots, as opposed to round holes. These will be the non-rail rocker heads and fully adjustable valve train. but they are still just pressed in studs, so with high spring loads you will have to swap for screw in studs. The 65 heads will have very clean exhaust ports, no bumps or bosses. Earlier 289 and 260 heads are equally nice, but will have the 1.67 intake valves. not really a problem. A good small chambered head, and adding the larger intake valve can allow a good rework of the short side radius. One thing you would notice if the heads were bolted on a block is the lack of casting material around the end intake bolts. The intake bolts are actually visual (naked and unprotected) below the intake manifold, right as they go into the head. When heads are stacked on a shelf, this little detail is a very quick IDing feature of the early heads without even pulling them from the shelf (although it could be 260 or even 221 head). The change around 66/67 added a little casting revison in this region. if its a '68 C8 casting 289 its worthless. a 63cc chamber that will look similar to the chambers of E- heads. The sole benefits of the 289 head over the standard 5.0L head is going to be compression and better exhaust (no bumps or protrusions '65/'66). On 5.0L swap the heads will be give you around 9.75. On a blueprinted and mildly decked motor/head (.010" clean-up pass), 10:1 (or a touch higher) is darn easy to obtain on the 302. Near 10.25:1 on a 306.

I have a set of small valved 260/289 heads that are superstock legal with 1.78/1.46 valves. Maybe the only legal head that can have the valve size changed and still be legal. I wont be getting rid of them anytime soon. Especially after losing my good set of C5AE's in a car sale.

If they are hipo 289 heads there are other things to look for, but most likely they aren't. Also, I have seen only one set of hipo heads (ever) that was not ported or had larger valves installed. A virgin set is rare. Someone needs to recast the hipo head or the original gt40 head (1.88/1.625) head.

I like the original early heads 260/289/302/351. But with the cost to properly set them up (and I am not even talking about porting) you have to really compare the cost delta of a set of used aftermarket heads. In other words, you have to want the old heads or need them (class legal) for them to really outweigh a purchase of much better head.







at the end of the day, maybe a 347 will lose 30hp over a 302   I just never thought so
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NASTY5.O
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« Reply #152 on: November 03, 2010, 08:50:02 am »

Man talk about a waste of time.
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Joel Beach
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nickb
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« Reply #153 on: November 18, 2010, 12:32:44 am »

     x2 on the wasted time
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FourtyOneFord
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« Reply #154 on: December 04, 2010, 10:06:54 pm »

 

Great thread,  I'm surprised.  really.  really surprised.   

I knew Hp = (Tq * RPM)/5252. 
My (limited) experience with American motorcycles tells me that strokers make more torque and that you need RPMs to make power. 
Typically the stroke is much shorter on the high RPM jap bikes.
Oh yeah I had to read that whole 347 vs. 351 thread before I could come back and finish this one.
Of course I knew F=MA but boy was it applied well there (in 347vs.351).

Question for me now is what to do with the 93 Cobra GT40 heads I have, and the E303 cam I bought.
I sure don't wanna end up like this kid.

 Thanx!
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'41 Ford business coupe 347 scat crank, GT40 heads, E303 cam, FRPP Victor Jr, Holley 750 dp

Quote
The author is a fairly well known idiot, who hasn't built anything.  So whatever
advice he gives is in question...
69 Merc
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« Reply #155 on: December 06, 2010, 02:41:19 pm »



Great thread,  I'm surprised.  really.  really surprised.  

I knew Hp = (Tq * RPM)/5252.  
My (limited) experience with American motorcycles tells me that strokers make more torque and that you need RPMs to make power.  
Typically the stroke is much shorter on the high RPM jap bikes.
Oh yeah I had to read that whole 347 vs. 351 thread before I could come back and finish this one.
Of course I knew F=MA but boy was it applied well there (in 347vs.351).



Question for me now is what to do with the 93 Cobra GT40 heads I have, and the E303 cam I bought.
I sure don't wanna end up like this kid.

 Thanx!


Sell 'em on Ebay?  
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 1" aluminum open spacer, CamMotion HR .624"/.609" 251*/256* 108* LSA, 1-3/4" x 3-1/2" headers into Dynomax Ultra Flo #17224 mufflers, Broader Performance reverse manual V/B under a C6/4R100 behind a 8"/9" billet 5500 stall converter, 9" 4.56 Detroit Truetrac, Hoosier Pro Street 31" x 12.5" R15" on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html  Now = http://sbftech.com/index.php/topic,34648.0.html

Thanks to Jim "Woody" and Nicole Woods @ FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
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« Reply #156 on: December 13, 2010, 10:55:43 pm »

yeah ebay em,just not to anyone on here. Good Luck!
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jayh
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« Reply #157 on: March 29, 2012, 04:34:34 pm »

http://www.yellowbullet.com/forum/showthread.php?t=460742
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jayh
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« Reply #158 on: January 11, 2016, 11:00:44 am »

did anyone ever figure out who OP was?  Whistling
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