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Old 01-22-2014, 05:28 PM
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383 Stroker Build. Got a Question?

Im building a 383 stroker for my 79 Malibu. I am just building a decent power street motor for this car.

I will be using a Comp Cam 502 lift xtreme energy cam with Brodix 64cc heads. I will be using Forged mahle flat top pistons. Should be between 400 to 425 hp depending on a few touches here and there.

The questions is, for the crank and rods, I will be using Scat crank and rods, I am thinking just cast crank and rods will work, but looking for input if I should go with forged crank and rods? Which one? Cast or Forged crank and rods?

Thanks guys.

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Old 01-22-2014, 06:02 PM
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I've always been an overkill guy, and would go forged for the 425 hp range, but it's not necessary. I figure you're c.r. will be 11:1 if you're .025 in the hole, 11.7 if zero decked, assuming a .041 gasket, on the edge for pump gas. Also, depending on cam, intake, head specs and carb choice, 425 might be a stretch, more info needed to determine that.
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Old 01-22-2014, 06:08 PM
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Originally Posted by 68NovaSS View Post
I've always been an overkill guy, and would go forged for the 425 hp range, but it's not necessary. I figure you're c.r. will be 11:1 if you're .025 in the hole, 11.7 if zero decked, assuming a .041 gasket, on the edge for pump gas. Also, depending on cam, intake, head specs and carb choice, 425 might be a stretch, more info needed to determine that.
Well, Im asking about cast vs. forged parts right now. Im not concerned with listing all specs of the cam, intake, and heads and what not. Im building a motor between 400 to 425 hp. My question is, are forged parts necessary or not for a 400 to 425 hp street engine that is not turning high RPM's? Compression will stay around 11:1.
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Old 01-22-2014, 06:15 PM
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Yeah, cast crank is fine for 400hp, its fine for 450.

Get your rods peened at least. It makes them awesome.
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Old 01-22-2014, 06:46 PM
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Scat cast steel crank, Scat Pro Stock forged steel rods. Good to 550 hp.

Street motor.....11:1 SCR......
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Old 01-22-2014, 08:47 PM
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Originally Posted by techinspector1 View Post
Scat cast steel crank, Scat Pro Stock forged steel rods. Good to 550 hp.

Street motor.....11:1 SCR......
The Scat Procomp rods with 7/16 bolts.

Make sure your using a stroker rods so you won't have to use a reduced base circle cam.
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Old 01-22-2014, 11:12 PM
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for a mere 425 hp,just build a 355
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Old 01-23-2014, 11:12 AM
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Hoping your talking about a L31 roller block.Huge fan of Howards stroker kits but not just their forged crank but the full stroker kits and have them balanced.They come with 6" rods.

Competition Products - Performance Engine Parts, Racing Engine Parts and Accessories

If your talking about a 1pc rms block or crank,there is a adapter kit for that either way.



This adapter converts a 2pc rms crank to a 1pc rms block.

Nice thing about the Howards forged stuff is if you decide to hit it with spray,it gives you plenty of room to do that.

Last edited by 1Gary; 01-23-2014 at 11:23 AM.
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Old 01-25-2014, 10:47 PM
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Scat cast 9000 crank, Scat 6 inch, i beam, 7/16 cap screw type connecting rods, Mahle flat tops. = tough bottom end with 11-1 comp. Use E85 fuel or plan on mixing race and pump gas 50/50.
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