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Old 12-23-2011, 08:09 PM
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Combining 400/440 motor parts

hey folks , well im new to this posting thing so take it easy on me , lol . ok im looking for some help . i have a 68 440 doesnt run , and i have a running 73 400 . i want to put them together but not real sure as to what needs to be done . i do have a good idea but need more info . can anyone please help me before i spend a bunch of $$$$$ on un-needed stuff or machining

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Old 12-23-2011, 08:36 PM
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You probably need to be a little more specific. What do you mean the 440 doesn't run? Blown motor, frozen motor, can you turn it by hand, etc. From what type of vehicles did the respective engines come? What specifically do you intend to do with the engine? How much money do you have to spend on this? These are the kind of things that need to be known before any help can be offered. Just my $.02
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Old 12-23-2011, 08:39 PM
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I'm not really a big Mopar guy, but pretty sure you've got apples and oranges there. The 400 was the largest of what was referred to as the "low block" which was the old 350, 361, 383, and 400. The 440 was the largest of the "high blocks" which were 383, 413, 426, and 440. The two 383's were different blocks in old and new versions.
You should probably pick one (I'd pick the 440) and sell the other.
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Old 12-23-2011, 09:43 PM
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Well if it was me, I'd take the crank from the 440, have the mains turned down to 2.625 in. to fit the 400 and the counter weights turned down slightly to clear. Then bore the 400 .030 over and install a set of KB pistons with stock 440 connecting rods. Use the 452 heads from the 400 and walla... you've got a 451 stroker.

If you don't want to go that way and just want to rebuild one or the other then most of the exterior parts (except intakes) will interchange. Interior parts not so much without some machining.

We really need more information to give you a decent answer though.

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Old 12-25-2011, 06:04 AM
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451 stroker

MERRY CHRISTMAS. the 400 came out of a roadrunner , the 68 440 - i know that its a car motor , not a truck motor. the 400 runs good . the 440 , not real sure why it isnt running. a friend of mine is selling me both motors and both are bolted to working 727 torqueflite trannys. i agree with making it a stroker , that was my intentions when i asked about it . but wasnt quit sure as to what all i needed to do or have done ???? how about boring it .040 over ? and what about zero decking the block ?
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Old 12-25-2011, 10:52 AM
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Changed your thread title to something more informative, "confused" doesn't give any idea what technical issues you're having.
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Old 12-25-2011, 05:05 PM
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If you want to know the specifics of the 451 combo you need to read the 451 Manifesto.

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Old 12-26-2011, 10:27 AM
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451 stroker

thanks centerline, i just have a hard time beleiving that this build can be that easy. but i havent been able to find anything to verify any different. and having both complete engines just makes it all that much easier and cheaper . wish the rest of this project was this easy
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