sb 400 2-bolt main?
sb 400 2-bolt main? How much horsepower with this engine hold. My friend is building it and will be useing some afr 190 runners with a Hydraulic roller 231/237 540+ cam from cam motions and a leginfelter mutiport fuel injection intake with a 1000cfm tb. Will this 2-bolt main 400 sb hold this together? Also, how much power do you guys think this combination will make?
Joined: Mar 2005
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From: 32639 Groesbeck HWY. Fraser MI 48026
Originally Posted by texada
How much horsepower with this engine hold. My friend is building it and will be useing some afr 190 runners with a Hydraulic roller 231/237 540+ cam from cam motions and a leginfelter mutiport fuel injection intake with a 1000cfm tb. Will this 2-bolt main 400 sb hold this together? Also, how much power do you guys think this combination will make?
http://www.motorcityoutlaws.com/user...y%20passes.WMV
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at that power rating he will have no problem with a 2 bolt block. beleive me we've got one with 12:5 cr 660 solid roller and a set of track 1's that eats 325 shots regularly. with a cast crank and gm 5.7 rods
TECH Regular
Joined: Dec 2004
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From: Newark, Ohio
Just be sure he uses a good set of main studs, and have it align honed/bored to be sure all is well.
I'm running a stock block with splayed caps, no fill and we were well over 6 hundred ponies it was perfect after a teardown after running it for 3 years.
I'm running a stock block with splayed caps, no fill and we were well over 6 hundred ponies it was perfect after a teardown after running it for 3 years.
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From: ga
I went 9.70's with a stock 2 bolt block. Then it cracked, had severe cap walk and some other issues. If you want it to hold you can do some of the above mods or go ahead and buy a dart little m. add up all the machine work, caps, labor and you could have bought a dart little m.....
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On The Tree
Joined: Jan 2005
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Originally Posted by texada
How much horsepower with this engine hold. My friend is building it and will be useing some afr 190 runners with a Hydraulic roller 231/237 540+ cam from cam motions and a leginfelter mutiport fuel injection intake with a 1000cfm tb. Will this 2-bolt main 400 sb hold this together? Also, how much power do you guys think this combination will make?
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i remember reading an article on converting a 2 bolt 400sbc to a splayed 4 bolt using Moroso's setup i believe. it was supposed to be stronger than a 4 bolt 350 block. only way to go if that's what you've already got. however, NOSFEDGA said it best. add everything up and you can come very close to getting the much stronger Dart block. you will however still need to take it to a machine shop for final prep and to check the trueness of the block, deck, journals, etc. shouldn't be much, but well worth the added comfort of knowing your setup should last a very long time and hold LOTS of power. good luck with the buildup, and post up some more, hmhmmmm, higher quality video footage. that 3rd Gen looks killer and can move!
later,
Dave
later,
Dave
The 2 bolt 400s or a much better then the 4 bolts. due to the larger main journals there is less metal for the outer bolts in a 4 bolt. I would be more concered with the cylinder walls if you plan on making big power. A sonic test of the walls is cheap insurance.
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From: ga
Originally Posted by camrsz
The 2 bolt 400s or a much better then the 4 bolts. due to the larger main journals there is less metal for the outer bolts in a 4 bolt. I would be more concered with the cylinder walls if you plan on making big power. A sonic test of the walls is cheap insurance.
2 bolts are stronger, but her is the problem. CAP walk. The 2 bolt is stronger because of the extra material around them. But a 4 bolt will hole the crank better. Why else do people go to 4 bolt mains and aftermarket 4 bolt mains. Cap walk is a huge problem with 2 bolt mains. I have seen billett main caps also have this problem. BUt these were standar 4 bolt style not splayed. Just a little infor for you here. You will also save money in the future if you go ahead and get some splayed mains in there.....
Originally Posted by nosfedgta
2 bolts are stronger, but her is the problem. CAP walk. The 2 bolt is stronger because of the extra material around them. But a 4 bolt will hole the crank better. Why else do people go to 4 bolt mains and aftermarket 4 bolt mains. Cap walk is a huge problem with 2 bolt mains. I have seen billett main caps also have this problem. BUt these were standar 4 bolt style not splayed. Just a little infor for you here. You will also save money in the future if you go ahead and get some splayed mains in there.....
I belive the two bolt will hold that combo together just fine with studs.
Teching In
Joined: Mar 2005
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From: Independence MO
With all of this talk about the Dart blocks, aren't they dry sump only? Kind of an expensive add on. I know the motown blocks are wet sump, but I thought the dart blocks didn'y accept a wet sump system.....I could be wrong.
Originally Posted by texada
How much horsepower with this engine hold. My friend is building it and will be useing some afr 190 runners with a Hydraulic roller 231/237 540+ cam from cam motions and a leginfelter mutiport fuel injection intake with a 1000cfm tb. Will this 2-bolt main 400 sb hold this together? Also, how much power do you guys think this combination will make?
Mike
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From: ga
Originally Posted by Mad Dog
With all of this talk about the Dart blocks, aren't they dry sump only? Kind of an expensive add on. I know the motown blocks are wet sump, but I thought the dart blocks didn'y accept a wet sump system.....I could be wrong.
Originally Posted by Kraest
It'll definetly hold that. Based on the head/cam combo, I'm guessing around 430 hp at 6300 rpm.
Mike
Mike
Look at that little Gremlin go !! Sorry, previous AMC fan here. Nice 3rd Gen. and FAST !! 
TECH Resident
Joined: Jan 2003
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From: AUSTIN TX
I hope it will hold up for you, because that is what I am planning on building. Only difference is I will be de-stroking mine to a 378 cu incher, and hitting it occasionally with a 350 shot. I have often wondered if anyone has come up with main girdles for the SBC like they have for the Furds. That would add a little confidence with out the large price tag of splayed caps and the additional machine work necessary to use them. I agree, I would invest in a Motown block or Little M before I went through the expense of installing splayed caps.
