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Old 01-18-2007, 05:12 PM
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351W piston help needed please

This goes out to all you Ford guys and gals out there. I am looking at getting a new set of aluminum heads for my 351W. I don't know much about this engine but this is what I do know.

Standard bore block (non roller cam)
D00E Heads ported and polished with 1.94/1.6 valves
forged pistons

Apparently this is a 9.0:1 engine. I need to know if ford made a oem forged piston for the 351W? And if so what is the part number and what is the size of the dish. I've read that the 351 H.O. had forged pistons but can't find any data on them. I'm looking at AFR 185 heads with 58cc chambers and would like to keep the compression low enough not to be a dog but be ready for a supercharger in the future.

Thanks,
Rippin Ron

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Old 01-18-2007, 11:58 PM
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FORD HO pistons are hypereutectic. You need to go to ROSS or another specialty piston manufacturer for forged. They will work with you on picking the correct piston.
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Old 01-19-2007, 12:04 AM
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Lots of guys just run the stock forged pistons out of 86-92 Mustang 5.0's. They are usually combined with "football" stock forged rods out of old 351W and a Scat stroker crank. Put it together and you have one sweet 393 stroker for very little dinero. I *think* with the AFR 185 heads you are looking to get around ~10:1 compression, but don't quote me on that.
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Old 01-26-2007, 06:34 PM
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I got to the machine shop too late to see the engine apart. I snapped a couple pics. I measured the connecting rods as best I could and they are around 6 1/4 inches. Does anyone know if these are 302 pistons?? They are a ford piston and the part number appears to be 800c (its kinda hard to read it in the block). If you used 302 pistons in a 351 what stock rod would be long enough to make it work? Please can anyone enlighten me I dont know much about fords.
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Old 01-26-2007, 06:50 PM
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Since you already have pistons in there, you need to liquid measure the exact ccs so far so you can choose the heads you need.

I like the AFRs

The dish in these pistons might work well to maintain good quench with heart shaped chambers, if the piston isn't too far down into the hole. Try for .040 quench distance from the piston top to the head surface. That might mean a thin gasket.

The W has a 1.298 taller deck than the 302/5.0s. That would make that rod just about right. The 302 rod is 5.095 I think.
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Old 01-26-2007, 07:06 PM
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Thanks xntrik for the quick reply. I'm thinking they are around 22cc thats going by pictures of other dished pistons but close only counts in horseshoes. Could you tell by the pics if these pistons look forged?? Heres a couple more pics.
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Old 01-27-2007, 11:37 AM
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Those are not forged pistons.

tom
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Old 01-27-2007, 11:46 AM
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Quote:
Originally Posted by machine shop tom
Those are not forged pistons.

tom
How can you tell by the picture?
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Old 01-27-2007, 12:09 PM
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Quote:
Originally Posted by xntrik
How can you tell by the picture?
I can tell by the inside of the skirt in this picture:

http://www.hotrodders.com/forum/atta...chmentid=17968

tom
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Old 01-27-2007, 12:14 PM
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Quote:
Originally Posted by machine shop tom
I can tell by the inside of the skirt in this picture:

http://www.hotrodders.com/forum/atta...chmentid=17968

tom

OH farfegneugen....... I overlooked that

Thanks Tom
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Old 01-27-2007, 12:16 PM
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Quote:
Originally Posted by xntrik
OH farfegneugen....... I overlooked that

Thanks Tom
Gesuhndheit!




tom
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Old 01-27-2007, 12:27 PM
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I guess there wouldn't be a casting number on a forged piston?? Is a forged piston machined out of a solid piece of aluminum? Thanks for the information its much appreciated.
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Old 01-27-2007, 01:02 PM
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Quote:
Originally Posted by RippinRon
I guess there wouldn't be a casting number on a forged piston?? Is a forged piston machined out of a solid piece of aluminum? Thanks for the information its much appreciated.

K I S S

A cast piston is just melted aluminum poured into a mould to harden.

A forged piston is also cast (different alloy) but then it is compressed by dies just as it hardens/cools which causes the molecules to be squeezed together which makes them stronger. That's called "forging".

Obviously they are machined to dimensions later.

No pistons are machined from billet.... much too expensive..... probably be several hundred dollars EACH.

FYI Hypereutectic is just a high silicone alloy that is cast then machined. Stronger than cast, but less strong than forged and usually has a very low expansion rate so they can be fit very snugly into a cylinder. Good for low ring wobble, that is...... lower emissions and longer wear life since it is tighter fit when new.

Forged, although strong, generally have a higher expansion rate and require larger installed clearances.

shape, structure, etc. You can see there is much much more to piston technology than just a chunk of aluminum to hold rings. It's really pretty fascinating when you delve into it.

Last edited by xntrik; 01-27-2007 at 01:15 PM.
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