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383ci. Magnum vs. 400ci.

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  • #16
    you can buy a sonic tester on ebay now days for less than $100
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    • #17
      Picked up 2 sets of heads tonight . A set of 906's and a set of 516's
      All throttle , no bottle .


      • #18
        400 is basically a 383 cast for 4.34 pistons vs the 383 at 4.25. mopar thought the extra 17 cubes would help make up for the lower compression for emissions in 1972? almost all 400's have cast cranks where until late 71 383's where all steel. cranks are the same otherwise. motor is OK got a bad rap. so a 383 crank and rods are the same if you want to go forged. they do make a nice 451 with a 440 crank and rods 440 crank mains have to be cut down. now while your at it if you cut rods to 2.20 chev size and offset grind you can get to 3.90 stroke to build a nice 474 cuber. 906 heads are good 516s won't flow shit even with the bigger valves because the intake bowl and ports are so small.