Clevite 350 .030 over flat tops - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-02-2004, 08:26 PM
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Clevite 350 .030 over flat tops

Would these be good Pistons for a 383 Project, i can get all 8 for $75 New, up to 500HP....they are cast

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Old 08-02-2004, 08:32 PM
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Cast pistons in a 500 HP engine (which I doubt you will ever get with those decked rebuilder-style pistons) simply will not hold up. Plan on spending decent money on decent pistons, at least a good hypereutectic (and not a claimer-style, either).

tom
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Old 08-02-2004, 08:34 PM
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it will prob be more around 430HP, and around 500 Pounds of Torque, they still wont hold up???
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Old 08-02-2004, 10:09 PM
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What Tom is saying is, cast pistons were never intended for high horsepower engines, most of the cheap "rebuilder" pistons as you are interested in are made for stock street engines not making 200 horses, most of these pistons have .020 off the tops, which kills compression and quench, the company that makes the piston don`t tell you that, and the company selling them don`t tell you that either. If your planning on making the power you said, then you need compression and quench, since these go hand in hand with making power and all parts working as a team to reach that goal. a set of the speed pro hyper`s with coated skirts would likely suit you fine, go to dirt track thunder and look over what they have. also remember this, you can`t sneak up the horsepower ladder in little stages, if you do, you`ll always be up against the weakest link in the engine, I wouldn`t spend $2000 in a stroker motor and use $75 pistons, as soon as one let go you`d be starting over, which only costs more.
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Old 08-03-2004, 09:32 AM
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Quote:
Originally posted by 1980 Malibu
it will prob be more around 430HP, and around 500 Pounds of Torque, they still wont hold up???
I'd really like to see the recipe for that engine.

tom
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Old 08-03-2004, 10:53 AM
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I think those are just ballpark figures Tom, he's new to the hobby and trying to learn, gotta hand it to him in that respect. Also, isn't it usually a higher RPM that destroys stockish parts (rods, slugs) rather than horsepower (sort of hard to separate given the two are often seen together).

K
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Old 08-03-2004, 02:01 PM
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Quote:
Originally posted by machine shop tom
I'd really like to see the recipe for that engine.

tom
I was thinking along the lines of this.....

sportsmanII 200 cc heads, solid cam .493/.512 lift : 257/269 durration @ .050, full roller rockers, KB pistons, 4340 crank and 6" h-beam rods. weiand single plane with holly 830DP
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Old 08-03-2004, 02:42 PM
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Must be a pretty BIG ballpark!



tom

Quote:
Originally posted by machine shop tom
Must be a pretty BIG ballpark!



tom
Good start. Gonna need at least 10.5:1 compression and a bigger cam.

tom

Last edited by machine shop tom; 08-03-2004 at 02:42 PM.
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Old 08-03-2004, 02:53 PM
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Quote:
Originally posted by machine shop tom
Must be a pretty BIG ballpark!



tom



Good start. Gonna need at least 10.5:1 compression and a bigger cam.

tom
lmao
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Old 08-03-2004, 03:00 PM
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Quote:
Originally posted by machine shop tom
Must be a pretty BIG ballpark!



tom



Good start. Gonna need at least 10.5:1 compression and a bigger cam.

tom
What do u mean?
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Old 08-03-2004, 03:37 PM
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well I think he means that the numbers may be inflated a bit. First off, are you building the 383 that you were talking to me about, or a 350? 383 = AUTOMATICALLY more torque. Garaunteed. Torque is work, and bigger engines do more work, make sense. Horsepower, however, takes finesse. Horsepower is basically how well your engine can move air, the more efficient the better. 500 horsepower is just not going to happen with that combo, and without high R's or forced induction, 500 lbs is probably not going to happen either. What are you paying for those sportsman II's? You can get dart iron eagles on ebay for 699... much better head than the world head for the stroker. You will be able to hit the 430 and about 450 pounds pretty easily with the stroker-

K
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Old 08-03-2004, 05:01 PM
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Quote:
Originally posted by 1980 Malibu
I was thinking along the lines of this.....

sportsmanII 200 cc heads, solid cam .493/.512 lift : 257/269 durration @ .050, full roller rockers, KB pistons, 4340 crank and 6" h-beam rods. weiand single plane with holly 830DP
I haven't looked but I don't think that clevite make a cast stroker piston for use with 6" rods. Maybe a cast hyper eutectic piston. A 4340 and low buck pistons are as mismatched as a milk bucket under a bull.
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Old 08-04-2004, 08:10 AM
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Ya, i think im going to go with the KB Pistons
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Old 08-04-2004, 08:33 AM
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I remember somebody posting about KB's not holding up under detonation or N20 or something. Can somebody fill out this point?

K
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