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Old 03-24-2008, 03:53 AM
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SBC 4" stroke. What's involved?

I am planning a hefty 383 LT1 build for my 96 Impala SS. I already bought a new forged 3.75" crank and forged H-beam 6" rods that I found on Craigslist super cheap. Now I found a similar deal on a 4" crank. Is this something I should consider? Isn't it a real pain to try and fit a 4" crank in a modern LT1 without hitting water?

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Old 03-24-2008, 05:38 AM
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Curtis with that much stroke and depending on the connecting rod that you use there will be a lot of grinding involved and if you don't hit water you will be lucky.

On those blocks most of them came with 2 bolt mains and you should think about stepping up to splayed caps with either stroke as more stroke will make those caps walk. But it depends how deep your pockets are!!!!!!!

Here is link to look over
http://ls1tech.com/forums/showthread.php?t=652566
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Old 03-24-2008, 01:04 PM
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Ok.. .I'll stick with what I have then. Just wondered if it was a possibility, but it doesn't sound like its worth it for the extra 20 cubes.

4-bolt mains are definitely in the plan.
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Old 03-24-2008, 07:07 PM
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what about 1st gen smallblocks, can they be notched to clear 4 inch stroke? ive seen kits for it but does the block have to be aftermarket?
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Old 03-24-2008, 11:13 PM
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Many aftermarket big stroke crankshafts like that come with 350 mains, not 400. Making your block selection limited to a Bowtie block or Dart in cast iron that has 350 mains, but big bore capability. Or one of several aluminum blocks such as Rodeck, or Donovan or others. So double check what main size the crank is before you buy one....
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Old 03-25-2008, 06:04 AM
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Quote:
Originally Posted by runn141
what about 1st gen smallblocks, can they be notched to clear 4 inch stroke? ive seen kits for it but does the block have to be aftermarket?
We have had calls about notching out blocks for big stroker cranks and getting into the water jackets, Dart blocks are set up for a 3.875 stroke crank and we still cut the pan rails for a little more clearance. The Bowtie blocks need a lot of clearance work!
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Old 03-25-2008, 10:50 AM
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Quote:
Originally Posted by CNC BLOCKS N/E
We have had calls about notching out blocks for big stroker cranks and getting into the water jackets, Dart blocks are set up for a 3.875 stroke crank and we still cut the pan rails for a little more clearance. The Bowtie blocks need a lot of clearance work!
Stroker engines of this type are definately for those who have a lot of experience in this area or is working with someone that does. Grinding into the water jacket would not start your day off very well. Many times the heads of the connecting rod bolts are also clipped to give clearance in the pan rail area and bottom of the cylinders so that a minimum amount of material is removed from the block. Its done successfully everyday by many Outlaw Sprint engine builders and Dirt racers who use 417 and larger engines. But you need to start with the right components that are made to be used for those applications to begin with. It isn't something you would want to be your first attempt at doing yourself, leave it to the pros like CNC blocks and others or take their recommendations that they have already given.....
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