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).
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
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.
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.
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.
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.
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.