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Old 08-02-2010, 02:53 PM
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377 or 400??

i want to know if i should build a 377 or a 400 SBC which will last longer? because i have a 400 cast crank and a 350 forged crank its for racing so it will take some tourture thanks.

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Old 08-02-2010, 03:26 PM
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Quote:
Originally Posted by jeremy1346
i want to know if i should build a 377 or a 400 SBC which will last longer? because i have a 400 cast crank and a 350 forged crank its for racing so it will take some tourture thanks.
Should we assume you have a 400 block to put either of these into?

Bogie
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Old 08-02-2010, 03:51 PM
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yess it is.
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Old 08-02-2010, 05:50 PM
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If I had a 400 I`d build a 400. a 400 will eat a 372 or a 383.
By destroking the 400 to a 372, your making it into what we call a hotter 350. It will run and act like a good strong 350 but will have improved power in the upper RPM band due to the larger bore`s ability to breathe.
We`ve built them all, 350, 372, 383 and none of them even came close to hanging with the 400.
Use 5.7 or 6 inch rods in your 400 build and this will increase it`s life. The issue`s with stock 400s is the long stroke and short rod places a high load on the thrust side of the piston increasing wear. Using the longer 5.7 rod reduces it some, a 6 inch rod reduces it even more. You can learn more about rod ratios here:
http://victorylibrary.com/mopar/rod-tech-c.htm

Last edited by DoubleVision; 08-02-2010 at 05:58 PM.
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Old 08-02-2010, 06:31 PM
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Why do people post the same question twice?

Nevermind that I mistook 377 for 383. lol

Last edited by cobalt327; 08-02-2010 at 06:42 PM.
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Old 08-02-2010, 06:57 PM
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I feel for Jeremy. Poor fellow, he has started 6 different threads now, trying to find out what to do with the few parts and little money that he has to work with.
http://www.hotrodders.com/forum/sear...archid=3639141

Jeremy, buddy, you need to save some money before you start on this motor. Last I heard, you had only 500-600 dollars to spend. That won't even pay for a stock rebuild. Save some more dough and do some reading while you save up. Here's a good start....
http://www.amazon.com/How-Rebuild-Yo...0797020&sr=1-6
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Old 08-03-2010, 08:55 AM
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i have been saving accually and now i have about 3000 dollars to spend so can you direct me to which parts i should buy how i should make this motor come alive!? Thanks



Maybe this kit would work? http://www.speedomotive.com/ps-541-8...crank-kit.aspx i have intake and 64cc camel humps and a holley 650 double pumper. and my dad and uncle used to race so i have all the gaskets. and was thinking about using this cam http://www.jegs.com/i/Comp-Cams/249/...oductId=746628 or whatever you have in mind?

Last edited by jeremy1346; 08-03-2010 at 09:12 AM.
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Old 08-03-2010, 09:04 AM
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400?
What plans for the engine? Strip, Street/Strip? Normally Aspirated, Boosted, Nitrous?
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Old 08-03-2010, 09:14 AM
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its for muddrags 250 yds long and strictly for that and occationally screwing around. Run off of turbo blue no blower nos ect..
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Old 08-03-2010, 01:15 PM
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Magnaflux, and maybe even sonic-check that 400 first. If you buy parts for the 400 and find out the block is un-usable...money wasted.
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Old 08-04-2010, 08:54 AM
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the block is all ready it bored out magnafluxed and ready to go
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