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Old 01-21-2010, 05:14 PM
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Need some help identifying pistons

I bought a 400 sbc off of craigslist today for 200$ It came with these pistons i cant find any info on. Sorry about the cell phone pics but the numbers are 400ap .030 307-04-02A [IMG][/IMG] [IMG][/IMG]

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Old 01-21-2010, 05:49 PM
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Did you take any pictures of the skirts? Do they have locks on the wrist pins?
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Old 01-21-2010, 06:29 PM
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Summit racing sales these, you can search pistons 400ap and find these, looks like you have a 30 over block also. hope this helps a little bit.
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Old 01-21-2010, 07:02 PM
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Thanks for the help guys. Probably not worth using in any type of performance application. I should warn that the casting quality is not so great just encase anyone was thinking of buying these for there build
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Old 01-21-2010, 09:04 PM
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Cast 400 Piston

Appears to be a cast piston available under Sealed Power, Federal, Sterling and others. They appear to be a good quality cast street piston. Maybe some of the resident pro engine builders can give you a rating. I'd run em in a street engine, especially cause their paid for. olnolan
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Old 01-22-2010, 04:00 AM
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the casting finish is of poor quality. I would not recommend these to anybody.
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Old 01-22-2010, 05:59 AM
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Quote:
Originally Posted by sherman8r
the casting finish is of poor quality. I would not recommend these to anybody.
When you get a chance, I'd appreciate it if you could shoot some images of the ring lands/grooves, skirts (pin and thrust), under the deck, etc.

This is a popular type and size piston and I'm soon to be building a street 400...

Thanks.
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Old 01-22-2010, 03:48 PM
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I looked at summits add today and I think I may have changed my mind about these pistons. They are half the cost of the pistons i have in my other 400. I looked at some old cast pistons at my cousins today after work and I feel like mine are not so bad at all now. Guess i was a little hasty. One other thing is NONE of his sbc pistons had USA in the casting.Could it be that china made pistons are more common than American made again I apologize about the cell pics
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Old 01-22-2010, 06:30 PM
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I worked the photos a bit:





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Old 01-22-2010, 08:59 PM
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Naked Eye

Just by the naked eye, they look to be at least as good as a factory equivalent. I have no idea what kind of power levels you're looking to build, but they would probably be ok in a mild cammed street machine. Don't let the dish fool ya on a 400 they will make 9.25:1 with big chamber heads and nearly 11:1 with small chamber. I run a dish just like this only forged in my boat 406 w/big 72cc sportsmans. I have read that a swirl port head design works real good with dished pistons maybe better than flat tops with a quench area. All depends where you're looking to make power. I've got a good idea that the swirl port w/ a moderate cam would make a trick street engine, more like a stoplight bandit than a real high end car.olnolan
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