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Old 08-21-2002, 04:21 PM
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Post Turning my 350 into a 383?

Plan A was to build a tight little 327. That fell trough when my machine shop found a crack in the block (that would explain why I got it for free). So plan B is to build a four bolt 350. But I can't get my mind off stroking it to 383. My question is what does this involve? I'm guessing different crank and rods with 350 pistons. Any light on the subject would be put to good use. Thanks

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Old 08-21-2002, 04:37 PM
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There is alot of little things involved. The best way in my opinion is to buy a kit with everything you need. You can get a 400 crank and get the journels turned down and wacth out for cam clearance you need 3.75 rod and pistons for a 383, 350 pistons can hit the heads. your rods need to be able to clear cam, and the cylinders might need to be modified to clear rods plus being bored. 030' over
good luck

[ August 21, 2002: Message edited by: cc69 ]</p>
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Old 08-22-2002, 04:08 AM
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I think I was wrong on saying that 350 pistons would hit the cylinders i think the skirts are to long. There is something kind of adjustment needed to be made. A company called Power House makes some good kits they were fetured in Hot Rod mag. last year.Their website is www.enginekits.com
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Old 08-22-2002, 09:17 AM
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block will have to have alittle material removed by the bottoms of ea. cylinder to make way for the crank but this is so common that all machine shops ought to know about it. don't know the cost. there's lots of crank kits out there. speed-o-motive 562-945-2758 has crank piston rods for $400, and $500; powerhouse 661-861-0167 same for $470; summit probably @$1100;PAW@$650 scoggin $900 have to call and ask what all comes with what.
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Old 08-23-2002, 07:43 PM
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O.K. I'm leaning toward the kit that powerhouse puts out. So with this kit I won't need to machine the 350 block anything special? And do I treat the 383 like a 400 when it comes to using a 400 balancer and flexplate? Finally I believe I read my compression will be at 9.6 with the heads I have (76 cc), can I bring that down closer to 9.0 with the right head gasket? Thanks for all the help!
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Old 08-24-2002, 04:09 AM
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You still might have to grind out on the bottom of the cylinders for rod clearance. Yes you need a 400 balancer and flexplate. A thicker head gasket will bring down compression.
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Old 08-24-2002, 07:44 AM
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[quote]Originally posted by cc69:
<strong>You still might have to grind out on the bottom of the cylinders for rod clearance. Yes you need a 400 balancer and flexplate. A thicker head gasket will bring down compression.</strong><hr></blockquote>

I did see one example, (don't remember where) where by using special narrow rods, you wouldn't have to relieve the bottom of the cylinders . Still, I guess it would be easier to do a little grinding than to find these "Mystery rods."

[ August 24, 2002: Message edited by: Cynsguy ]</p>
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Old 08-25-2002, 01:59 AM
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only a LITTLE grinding was needed on my sbc.
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Old 08-27-2002, 04:08 PM
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I had my machine work done in a shop in amarillo tx. thay had the kit i let them build the bottem half. check your local machine shops.
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Old 08-28-2002, 12:56 PM
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The engine has to be bored over .030 and u need a 400 crank w/ a 5.7 rod. You can buy the whole kit. I purchased mine from Crower, but if this is a budget build up or street motor. There are a ton of companies out there that offer theses kits.
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