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Old 07-26-2008, 01:11 PM
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sbc 283 to 302 help

Hi, I have 3 283 blocks. Casting numbers are (2) 3849852 and (1) 3896944. I already have a set or jahns forged full skirted racing pistons for a 283 .125 over. Can anyone tell me if either of the 3 blocks can be bored .125 over. I know certain 283's can. I'm just not sure which ones. Thanks for any advice/help. Also any advice or tips on what to put in this motor would be appreciated. Thanks

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Old 07-26-2008, 02:01 PM
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Call up one of the automotive machine shops near you and ask it they will sonic check the block for you. You'll need a minimum of 0.135" wall after boring and honing.
http://local.muskogeephoenix.com/Fay...2728.home.html
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Old 07-26-2008, 02:54 PM
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Quote:
Originally Posted by rschmidt86
Hi, I have 3 283 blocks. Casting numbers are (2) 3849852 and (1) 3896944. I already have a set or jahns forged full skirted racing pistons for a 283 .125 over. Can anyone tell me if either of the 3 blocks can be bored .125 over. I know certain 283's can. I'm just not sure which ones. Thanks for any advice/help. Also any advice or tips on what to put in this motor would be appreciated. Thanks
Either should bore .125 without a problem, I'd be more tempted to use the older block 3849852 as they tend to be meatier.

Bogie
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Old 07-26-2008, 04:03 PM
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A short fill of Hard Blok on the water jackets will go a long way toward making a better ring seal.



Larry
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Old 07-26-2008, 08:36 PM
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As "Tech" said, which ever block you choose have it sonic tested first. Don't play a guessing game when you're taking that much meat out of it. I would also look into installing splayed main caps with ARP studs cuzz you know you're going to RPM the sh-- out of it.
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Old 07-27-2008, 02:02 AM
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"cuzz you know you're going to RPM the sh-- out of it."
Ain't it the truth!!!!!
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Old 07-27-2008, 07:17 AM
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I have the same 283 engine (3849852) out of a 65 elcamino. It runs, but smokes. It's never been gone through.
I'd like to build this engine up and use it in my 68 chevy truck. I'm just building a driver, but would like to kick up the hp. I was wanting to upgrade to heads with the accessory holes, and change the intake so I can utilize an edlebrock carb I already have.
Assuming the block checks out, can someone help with a build up sheet for this engine?

Thanks, Mark
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Old 07-27-2008, 07:30 AM
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We we sonic test a block we shoot for .160 plus on the skirt sides of the cylinders as Grumpy Jenkins posted that in one of books and we have seen cylinders in performance applications crack around .135 wall thickness.

We actually have a 57 - 283 (no side motor mounts) block that we can offset bore the cylinders to 4.000 and end up with .190 on the skirt sides

If you can come up with a 6 inch rod pistons it would surely lighten up the piston a lot.
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