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Old 11-22-2010, 07:54 PM
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389 Pontiac Piston

I got a 65 389. It has a rough cylinder (sat with water in it)The rest of the cylinders are very good. I have a sleeve for the bad one and I am looking to punch it .030. I realize I could punch it .0625 over and use 400 pistons (stock bore) and that may happen.
I saw the silvo lite 1526 design with valve reliefs for the two different valve angles used on pontiac heads.
Anyone have feedback on how they affect overall performance? wouldnt they tend to act like a dish piston and be kinda low performance.
What about flame propogation? Wouldnt they burn slow due to the choppy design of 8 relief angles to interfere with combustion?
I would really like to run flat tops for this motor and do ( exstensive) work on the closed chambered heads that are on it to get the compression down enough for it to live on the steet with the swill at the pumps these days.
I think it would be a plus to have the option to run either design (valve angle) heads on this motor but I would rather make it look as 1965 as I can.
You know 389 didnt come with "X " heads LOL

I dont really want to bore it to 4.120 either ,but I will.

Call me a purist, I know...I know...

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Last edited by latech; 11-22-2010 at 08:08 PM.
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Old 11-22-2010, 08:02 PM
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This is what they look like.
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Old 11-22-2010, 08:40 PM
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I don't know anything about the Silvo-Lite pistons other than they are made by Keith Black, but I would look for some opinions and if they were good, that's what I'd use. You don't want to bore that block that much without having it sonic checked.

Bill
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Old 11-23-2010, 05:40 AM
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I have a line on a guy that has some nos forged pistons.in .040 for the 389.
He has a wharehouse full of stuff for old engines 50 60 70 s. I will probably go that route. I have used silvolite several times in the past for stock builds and a few mild street motors and they worked just fine.I wouldnt have a problem using them in this build as I dont think I'll be over 350 horse anyhow, just nice for the street and pump gas friendly is what I am aiming for.I want to drive this car not just look at it.
My concern was for a los of performance due to the dome shape on the one size fits all piston I showed. Goes back to what I believe... If its easy it probably wont be good.
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