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#1
12-17-2004, 01:24 AM
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400 or 440 stroker?
I was going to put a 4.15 crank in the 383 of my 70 Barracuda. I have now decided to store the 383 and get another block. I have a choice between a 400 or 440 block, both blocks are 74s and will cleanup with a .030 bore. What are the pros and cons of each? I have a roller cam to grind too about .575 lift and 290 or so duration, hydraulic roller lifters, double springs with damper, stainless roller rockers, titanium retainers and keepers. I also have a dual shot nitrous kit, 250hp. It will be street driven and raced. Thanks!
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#3
12-17-2004, 04:22 AM
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This is a difficult question. 4.15" stroke is in the upper range for the 400 block with RB length rods of being sensible for a treet & strip car. The pistons will end up being very short and with a very high pin position, that may not be good for longevity, the piston pin will be in the oil ring groove. But they will be light. The 400 block is a little stronger than a 440 block if the crank is turned down to 400 main size. In both cases you have to do something for the bottom end, aftermarket rods would be great, if not mandatory. Maincap bolts should be replaced with studs and the block linehoned. Adding a girdle or some other solution to make the bottom end stronger wouldn't be a bad idea either. Most likely need custom pistons to withstand the nitrous (and to get eth Cr where you want it). And you need good cylinder heads to support 500 cu in, using some mildly modified factory castings will be holding you back in power. "Edelbrock level" would be the smallest I would like to go with, but don't go with too big heads either is the intention is to have good street manners.
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#4
12-17-2004, 08:32 AM
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#5
12-17-2004, 10:16 AM
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In a 4.15" stroker, the only difference is about 100 grams lighter pistons in the 400 block version. The rpm's will most likely be head limited anyway. I have both, and can't tell any clear benefit of using the shorter deck block, except of course the external dimensions are smaller.
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#6
12-17-2004, 10:55 AM
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go with the 400 block. the first reason is the mains are stronger than the 440 block. the second is it is easier (usually) to put big headers in it because of the lower deck. third, the bigger bore will make any head you choose to run work better. fourth, even if its only 6", you'll get a bigger motor. the only draw back i can think of is a stoke/rod ratio thats not as good...depending on your final choice.
i wouldnt sweat the short piston or the pin being in the oil ring, i know of 2 mopar and 7 stroker ford guys with that "problem" with no problems....and yes, they are street cars. also, according to indy, barton, and hughes, a stock 400/440 block is good for 750hp.
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#8
12-17-2004, 10:11 PM
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i agree with everything dartgt66 said. the 400 will cost more because you will have to turn the crank but it will make headers and space issues better than a RB block. this is key if you decide to use indy heads down the road with raised exhaust ports.
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#9
12-17-2004, 10:51 PM
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These guys have B block stroker cranks no need to turn the mains down.
http://www.440source.com/
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#11
12-23-2004, 12:35 AM
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Quote:
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#13
12-23-2004, 02:51 PM
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