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Old 06-25-2009, 09:16 PM   #1 (permalink)
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408 Clevor?

Is there something I am missing here? KB879-030 pistons have a 0.030" overbore, 20cc volume, 0.927 pin diameter, and 1.266 compression height.

Could you use a set of these forged pistons ($460.39 from summit, no hypereutectic AFAIK) with a 6.200" connecting rod, and a 4.000" stroker crankshaft in a windsor block with cleveland 4V closed chamber heads without issues? You would lose a touch of quench height (depending on block decking, year, etc), but it would lower compression a smidge as well.

Last edited by Echo; 06-26-2009 at 12:29 AM.
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Old 06-26-2009, 01:45 PM   #2 (permalink)
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Re: 408 Clevor?

Hhmmm, should work, but thats one weird looking piston? Looks like it has been flat cut 3/4 of the way across... leaving a small "kick-up" on one side ??
If you do it, don't forget to notch your block for the 4V's
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Old 06-26-2009, 08:42 PM   #3 (permalink)
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Re: 408 Clevor?

Quote:
Originally Posted by cmf60 View Post
Hhmmm, should work, but thats one weird looking piston? Looks like it has been flat cut 3/4 of the way across... leaving a small "kick-up" on one side ??
If you do it, don't forget to notch your block for the 4V's
Yeah, it's kind of a weird looking piston, but whatever gets the job done.. right?

Is there a certain bore size that doesn't need to be notched (ie: 0.040" over or 0.060" over)?
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Old 06-27-2009, 01:56 AM   #4 (permalink)
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Re: 408 Clevor?

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Originally Posted by Echo View Post
Yeah, it's kind of a weird looking piston, but whatever gets the job done.. right?
I dunno Echo, I am a great "fan" of quench and even with a "normal" dish you still get some effect from the quench "ring" around the dish. In this case (atleast by the looks of the design) its going to have some quench from the small remaining pad on one side of the piston but have lots of deck clearance on the other !?!
What effect is it going to have on piston stability? Piston "balance"?

I don't think I have ever seen a piston like this.... it looks like a piston run they've messed up and then tried to "save" them by turning them in to something else?

Put it this way.... I wouldn't use them.... but hey, they maybe fine.

EDIT: A 60 over bore on a Cleveland "removes" the notches.
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Last edited by cmf60; 06-27-2009 at 04:43 AM.
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Old 06-27-2009, 01:06 PM   #5 (permalink)
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Re: 408 Clevor?

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Originally Posted by cmf60 View Post
I dunno Echo, I am a great "fan" of quench and even with a "normal" dish you still get some effect from the quench "ring" around the dish. In this case (atleast by the looks of the design) its going to have some quench from the small remaining pad on one side of the piston but have lots of deck clearance on the other !?!
What effect is it going to have on piston stability? Piston "balance"?
I don't think I have ever seen a piston like this.... it looks like a piston run they've messed up and then tried to "save" them by turning them in to something else?
Put it this way.... I wouldn't use them.... but hey, they maybe fine.
EDIT: A 60 over bore on a Cleveland "removes" the notches.
Heh, alright. I just found it while poking around on Summit and got curious. Thanks for your help!
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Old 07-13-2009, 06:44 AM   #6 (permalink)
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Re: 408 Clevor?

If you are interested in some more piston options..

TMeyer, Inc. Precision Automotive Machining
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