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Old 01-17-2004, 09:16 PM
400 Ford 400 Ford is offline
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Lightbulb Hi compression pistons 400 ci??

I am looking for high compression pistons for my '79 400 cui. F150. I have contacted parts stores and several online engine parts companies with no luck. Can anyone tell me where I can find higher compression pistons for this engine?
The stock pistons are very low compression. When I rebuild I want to give this engine some more horses under the hood and hopefully better mpg (currently get 9 mpg without a heavey foot or a load).
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Old 01-17-2004, 11:44 PM
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try a machine shop
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Old 01-17-2004, 11:54 PM
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you can always deck the heads alittle, give you some compression there, pending the heads you might be able to squeeze 1.0 out of them... I know that JE Pistons makes custom anything.
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Old 01-18-2004, 01:50 AM
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You might have better luck with 335 engines in the 335 engine forum.
No, there aren't and high compression pistons available for the 400.
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Old 01-18-2004, 07:33 AM
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A cheaper way than custom made pistons is to have the rod ends bushed to fit 351 Cleveland pistons. Lots of those to choose from.

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Old 01-18-2004, 10:49 AM
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You really don't need anything greater than 9 : 1 as when you finish your head work your probably going to be sitting on 10 : 1 or a little greater which is going require you to use 93 octane gas and you'll be getting about 7 mpg. Now, unless you're wealthy, you are going to be spending A LOT of money on gas. Most people don't factor this into their buildup equation until after the engine is already built then they realize they can't afford the Gas......you've got a 400 HP truck that is Too expensive to Drive on a regular basis..........s.kuteman
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Old 01-18-2004, 06:04 PM
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400 Ford,I used 351C piston's in my 400 and had the small end's bushed.I'm at 10 to 1 and the piston's ard still .025 in the hole.If I zero decked the block and shaved the head's I could get almost 12 to 1.
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Old 01-19-2004, 12:03 AM
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High compression pistons do exist for the 400M. I have a set in my LTD. The are very hard to find though. They were made by Dynagear and they are bored thirty over only cost me 124 dollars. I don't know if I can post phone numbers on here but if anyone is interested where I got them let me know.

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Old 01-19-2004, 12:36 AM
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Skuteman is right about mpg. I zero decked my block and milled my heads and installed a set of flat tops. I really don't know what my compression level is, but it has to have 93 octane, any less and it knocks and pings. I get about 6-8 mpg around town and on the interstate aound 18-20. The bright side is that is a strong motor that pulls like a frieght train. Sounds mean too, it has true duals with no cats and dual glass packs.
Anyway the part number for flat top 400 pistons is 1282P. I am going to call the parts store where I got mine and see if they have any more. I let you know.

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Old 01-19-2004, 01:42 AM
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You may be able to find a few sets of the flat top pistons on eBay. Distributors do not have them because they are no longer manufactured.

Ertel #1282P
Ohio Piston #1282P
BADGER # 40010F

There are a LOT of threads on this subject here if you use the search function.
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Old 01-19-2004, 01:56 AM
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None on Ebay right now.

Ok I just found some, they are $54 a set of 8, the 1971-2 8.4:1 compression pistons, they are stock replacements, the bidding ends in 8 hours, but I am gonna post the contact info, they have 5 pallets of them, and nobody has bid on them, I am sure they will relist.

1-800-792-9984 toll free from Maddog Racing. Mon-Fri 8-5 eastern.

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2453454000

these ones are 4.060" bore

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2454933415
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Last edited by Mattsbox99; 01-19-2004 at 02:04 AM.
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Old 01-19-2004, 02:01 AM
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MotorHaven will not carry engine parts. It may take a while to see them on eBay, you will need patience.
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Old 01-19-2004, 12:43 PM
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probe industries has flat top pistons to fit the 400
probeindustries.com


I looked @ the pistons on ebay that you linked and those are dish pistons not flat tops

Last edited by kkmart; 01-19-2004 at 12:54 PM.
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Old 01-19-2004, 04:48 PM
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I bought my flat tops off ebay. There made by badger. I am getting about 9.6:1 out of them. The guys has alot. He sells them on Ebay all the time. everything from stock bore to .60 over
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Old 01-19-2004, 08:03 PM
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Maybe the guys here can email you for his contact information. He may have bought the remains of that last production run before Ertel closed their doors. When I talked to them a year or so ago just b4 they closed they had about 100 sets available. They just put different labels on the boxes, the pistons are the same.
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Old 01-19-2004, 08:03 PM
 
 
 
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