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Old 09-27-2010, 10:26 AM
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383 wall thickness for 100hp shot?

I'm building an LT1 into a 383 pretty much per these specs.

My question: is .20 the minimum cylinder wall thickness for a 100hp shot of NO2? What are my chances of still having that much left if they take .030 from the bore?

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Old 09-27-2010, 11:28 AM
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Sounds like you are confusing .200" wall thickness with a .020" overbore??

You're worrying too much, 100hp is nothing and .030" overbore will be fine unless the block has a bad casting flaw, then it wouldn't matter anyway, nitroused or not. Difference between .020" overbore and .030" overbore is only 5 thousandths per side - human hair thickness.
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Old 09-27-2010, 12:19 PM
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A buddy of mine, I believe it's a LT1, has a TA and sprays a 250 shot. Stock bottom end. He eventually cracked a head I believe due to heat, AFR, but the short block held together after MANY, MANY passes. He was quite surprised how well it's held together.

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Old 09-27-2010, 01:02 PM
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Best thing to do is have it sonic tested before spending alot of money in machine work, The block does not have to be cleaned to have it sonic tested either.

I would look for at least .180 on the thrust at finish and at least .120 on the wrist pin side at finish bore.

Good luck
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Old 09-28-2010, 08:44 AM
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Thanks to all of you. I'm feeling better about my plan - lets hope I get good news from the machine shop!
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