383 or 406 sbc

Old 08-20-2012, 05:05 PM
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cs89chevy
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Default 383 or 406 sbc

a guy around my way has two blocks that have been through the necessary machining and reassembled what im asking is what would most of you racers go with the 383 is a fresh 30 over 350 block with a 400 cast crank external balanced with 400 rods forged flat top pistons


and the 406 2 bolt block cast crank 10-10 5,7 rods cast flat top pistons decked .10 both for around the same price would really love to have some help with this guys
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Old 08-20-2012, 05:47 PM
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BEAST477
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I wouldn't want either one with both having cast cranks. But that's just me.
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Old 08-20-2012, 07:21 PM
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csx8506
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What do you plan to do with the engine? And what type of car? Need more info?
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Old 08-20-2012, 09:13 PM
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fast75vega
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Default Re: 383 or 406 sbc

Originally Posted by cs89chevy
a guy around my way has two blocks that have been through the necessary machining and reassembled what im asking is what would most of you racers go with the 383 is a fresh 30 over 350 block with a 400 cast crank external balanced with 400 rods forged flat top pistons


and the 406 2 bolt block cast crank 10-10 5,7 rods cast flat top pistons decked .10 both for around the same price would really love to have some help with this guys
i built my budget 383 to hold me over till i got my 406 built.... it has all stock bottom end with keith black pistons and lunati cam and stock alum heads off a 85 vette.... i been spinning it to 7k though the traps for over 2 years now in the 1/4 running 10.60 et ... not a problem yet now my 406 is all high end stuff :wink:
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Old 08-21-2012, 04:39 AM
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outlaw256
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guys i know it should be forged all the way. but ive built engines with cast cranks and cast pistons for yrs and ive only had a few come apart. and when they did they were gettin old.ive left the line around 7000 a few times and missed shifts(cheap shifter) and watch my 12,000 grand tach say 10,000 and still drove it up on the trailer to go home. but ive also sweep up a few ponds of metal for the trash man too. but mostly they stay together. dont ask me how but its true.ive run 13.1 pistons on a cast crank.stayed together. that did come apart one day when we decided to put the juice to it and it had a tunnelram on it so we gave it a little to much i quess,cause thats one of the ones i swept up..lol should never smoke pot and think about cars.ever lol.. but i was young so what the hell it was only money and metal!!!!!!!! and a whole lot of fun!!!!!!!!!
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Old 08-21-2012, 05:23 AM
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fast75vega
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Originally Posted by outlaw256
guys i know it should be forged all the way. but ive built engines with cast cranks and cast pistons for yrs and ive only had a few come apart. and when they did they were gettin old.ive left the line around 7000 a few times and missed shifts(cheap shifter) and watch my 12,000 grand tach say 10,000 and still drove it up on the trailer to go home. but ive also sweep up a few ponds of metal for the trash man too. but mostly they stay together. dont ask me how but its true.ive run 13.1 pistons on a cast crank.stayed together. that did come apart one day when we decided to put the juice to it and it had a tunnelram on it so we gave it a little to much i quess,cause thats one of the ones i swept up..lol should never smoke pot and think about cars.ever lol.. but i was young so what the hell it was only money and metal!!!!!!!! and a whole lot of fun!!!!!!!!!
i hear ya... i was playing around with the rpm/shifting chips and got distracted and i hit 7500 when i forgot to put my shifting and rev limit chips back in my car...... going down the track and i hear the motor just screaming and shifted by hand.... then it hit me i didnt finish what i started ...ops:
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Old 08-21-2012, 08:35 AM
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Go with the 383 stroker but thats just my opinion...
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Old 08-21-2012, 11:41 AM
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I ran a 406 back in the mid 80s with a cast crank and 305 rods forged 12.5 pistons ( i did not build it) and it turn 8300 every pass 10.40s in 2600lb car 5.13gears for two years. I put the spray to it a few times and after a few times of that it ran slower on motor so when i pulled it down i found three bent rods. I think if you have a good balanced engine and turn it with in reason it will hang in there. I have ran both engines and had good luck and alot of fun.

Its all in what he plains on doing, really need more info!
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Old 08-21-2012, 11:59 AM
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I love both stories (wazup & fastvega) about the budget motors & cast bottom ends (and stock 305 rods) in motors running in the 10's & spinning 7K to 8300... that is awesome!! Gives us hope & courage to build on a budget with results!! Of coarse- like wazup says within reason & balanced well.
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Old 08-21-2012, 02:21 PM
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Originally Posted by Rigsby
I love both stories (wazup & fastvega) about the budget motors & cast bottom ends (and stock 305 rods) in motors running in the 10's & spinning 7K to 8300... that is awesome!! Gives us hope & courage to build on a budget with results!! Of coarse- like wazup says within reason & balanced well.
my motor was balanced and no noticeable vibration at all and 100 pounds of oil pressure going do the track... 45 pounds at idle :wink: i was told by a few old racer/motor builders including the man that builds my motors ... that for every 10 pounds of oil pressure...you can spin a motor 1000 rpm's.... i like to leave a buffer zone and never fully tested their theory..... lol they say the crank/rods fail when the oil barrier between the two fails and you get metal on metal.... it made sense to me and they been racing long before they had all these aftermarket parts now days
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