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Topic: 400 block (Read 497 times)
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2815spd
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400 block
« on: October 01, 2007, 12:45:09 PM » |
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What's the best years for the 400 block? How much hp can one of these take?
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Logged
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2815spd
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also are the main sizes the same on a 400 and 440?
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BBLM23
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also are the main sizes the same on a 400 and 440?
No. |
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Walter 1981 Dodge Aries 451 B1/BS Best 1/4 9.871 at 136.01mph 1969 Dart Swinger 431 B1/BS Best 1/4 10.649 at 126.45mph Racing Pro in street trim. 1981 Plymouth Reliant 400  http://bbdart.com/parts/parts.html |
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2815spd
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I assume the beefier 440 main is better?
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BBLM23
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I don't think so, some people do. On a 440 the crank journal is larger but that means the main cap is thinner. I would rather have the 400 size crank journal with more meat in the main cap and block.
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Walter 1981 Dodge Aries 451 B1/BS Best 1/4 9.871 at 136.01mph 1969 Dart Swinger 431 B1/BS Best 1/4 10.649 at 126.45mph Racing Pro in street trim. 1981 Plymouth Reliant 400 http://bbdart.com/parts/parts.html |
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2815spd
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On the after market blocks, are they all the 440 main?
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BBLM23
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On the after market blocks, are they all the 440 main?
I think so. The caps should be better on an aftermarket block, so less of an issue. |
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Walter 1981 Dodge Aries 451 B1/BS Best 1/4 9.871 at 136.01mph 1969 Dart Swinger 431 B1/BS Best 1/4 10.649 at 126.45mph Racing Pro in street trim. 1981 Plymouth Reliant 400 http://bbdart.com/parts/parts.html |
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2815spd
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On the after market blocks, are they all the 440 main?
I think so. The caps should be better on an aftermarket block, so less of an issue. I'm sending you a pm |
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speedymopars
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KB uses the 440 size mains, and is able to use either early or late bearings (#3 thrust) .
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70 Duster - Keith Black 526, 2 x 830 annulars/tunnel ram, big solid roller, 727 ProTrans, Strange 4.30s
77 440 Dodge van 12.96 @ 108 - 4800 lbs of love with a 2.72 peg leg and 1800 stall
74 cheyenne 452 stroker, 2x450's on a tunnel ram, 21 foot, Berkeley jet, place diverter
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2815spd
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KB uses the 440 size mains, and is able to use either early or late bearings (#3 thrust) .
Where do find prices and specs for these blocks?  |
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Steve DeTar
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The good ones are fairly hard to find. All 383's and 440's have smaller main saddles....except the later 440 blocks cast late in 76 to 79 that end with 630 in the casting number
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Engine by DeTar
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daniel_depetro
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1974 Dart Sport, 1974 Duster, 1971 Barracuda, 1974 'Cuda, 1970 Challenger R/T-SE, 1970 Challenger 340, 1971 Challenger 340, 1968 Coronet, 1970 Duster 340, (x2) 1973 Duster 340, 1971 Demon, 1972 Demon, 1973 Dart Sport 340, 1973 Dart Sport, 1977 Volare, 1971 Dart, 1970 Dart
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oldkimmer
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The run of the mill 400 block 451 stroker in my buddies old 70 duster ran 10.20s at 3000lbs.............kim.........
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MR. Mechanic...........Panther Pink Duster The Beast has been Unleashed!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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R5-P7 project
Jr. Member
 Offline
Posts: 84
BigBlockDart.Com
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Hi Friend, I prefer to bore out my 400 mains to 440 size to get better bearing selection. Actually, it's cost effective too; as you would
probably (I know I would) align bore the block anyway. Anyway, thats the way I would do it.
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dustymopar
Jr. Member
Offline
Posts: 67
moparuk.com
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Dustymopar (UK) - 1971 383 Plymouth Duster I tried everthing else, but speed is the only answer  |
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PureGTS
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Bearing choices be danged! I'd rather have a stronger BLOCK than cheaper or more choices of bearings. The Crank can be cut alot without hurting its strength significantly. But removing material out of an already weak area of the block (compared to an aftermarket block) just isn't helping you at all. That thick part of the main doesn't remain that thick all the way up in OE blocks. Past that machined area it gets real thin. The "R" blocks and aftermarket B/RB blocks have that thickness all the way up for a reason; you need it for making serious safe power.
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Knowldge is power, power is speed, speed is good, low E.T. is better
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3614230_400%20block.jpg
