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Old 02-13-2009, 10:41 PM
 
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chevy smallblock 400?

i heard a rumor that chevy smallblock 400s were known for blowing cranks is this true?could i get the scoop on the 400 if there worth messing around with or not.the engine would be going in a 1954 chevy truck.thanks for your time.tony

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Old 02-13-2009, 11:13 PM
 
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No that not True. We raced 400 SBC for many years and never had any failure. We also had on in our Elcamino for long time, and it mostly stock except the RV cam and Alum intake with 600 cfm carb.and never had any problems.
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Old 02-14-2009, 12:54 AM
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The 4-bolt version of the 400 block has less webbing material in the block than the 2-bolt. Back when this motor was first introduced and hot rodders began extracting high hp numbers, they found that the webbing would pull out of the crankcase and you'd run over the crank more readily with a 4-bolt block.
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Old 02-14-2009, 12:55 AM
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havnt heard about em blowing up but my stock one out of a van moved too much inside the block on the thrust bearing and it scraped all the counterwieghts on the cradle of the block so it needs a new crank if i want to build it.
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Old 02-14-2009, 06:53 AM
 
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Quote:
Originally Posted by techinspector1
The 4-bolt version of the 400 block has less webbing material in the block than the 2-bolt. Back when this motor was first introduced and hot rodders began extracting high hp numbers, they found that the webbing would pull out of the crankcase and you'd run over the crank more readily with a 4-bolt block.
so your saying the 2 bolt main is better with the 400
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Old 02-14-2009, 07:11 AM
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Yes, the 2-bolt block has thicker main webs. For more main cap strength most use the splayed 4 bolt cap conversion kits such as Milodon makes.
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