Is the mopar 400cid the same block as a 426 hemi?

Hi there, i have a 1972 dodge charger with a 400cid big block in it and i was told that the 400cid block is the same block as the 426 hemi, just want to know if this is true or not.



Thanks,

AdamIs the mopar 400cid the same block as a 426 hemi?
The 400 cubic inch is a "B" engine.



The 426 Hemi is a "RB" engine and most engine parts will NOT interchange between the two. The RB engine family has a taller deck height for a longer stroke.



Visit http://www.allpar.com/, click engines and go from there for more info.Is the mopar 400cid the same block as a 426 hemi?
B engines

All B-series engines have a 3.375 inches (85.7 mm) stroke. Plymouth called their version of the early B engine the Golden Commando. It produced 305 brake horsepower (227 kW). DeSoto's B engine was named Turboflash. It put out 295 brake horsepower (220 kW). Dodge's variant was called the D-500 and produced 320 brake horsepower (240 kW).



400

The 400 cu in (6.6 L) B engine was introduced in 1972. It shares the B family's 3.38 inches (86 mm) stroke, but is bored out to 4.34 inches (110 mm). There were standard- and high-performance options.





RB engines

The RB engines, produced from 1959 to 1979, are raised-block (taller) versions of the B engines. All RB engines have a 3.75 inches (95 mm) stroke, with the bore being the defining factor in engine size. Bore center distance is 4.84 inches (123 mm). All RBs are oversquare.





426

Not to be confused with the 426 Hemi, the 426 RB was a wedge-head RB big-block with a 4.25 inches (108 mm) bore. Produced from late in the 1962 model year to mid-1964, the 426 wedge served as Chrysler's main performance engine until the introduction of the 426 Hemi. It was initially offered as a "non-cataloged" option S42 in Chryslers (the number of such produced is uncertain), offered with 373 or 385 bhp (278 or 287 kW) via a single 4-barrel carburetor (11.0 or 12.0:1 compression ratio, respectively), or 413 or 421 bhp (308 or 314 kW) via ram-inducted dual-4-barrel carburetors (same compression ratios previously mentioned).[2] For 1963, horsepower ratings would slightly increase (see below), and it became optional in B-bodied Dodges and Plymouths. After 1963, it would be used only in Dodges and Plymouths.[3]



The Max Wedge was a race-only version of the 426 wedge engine offered from the factory. Known as the Super Stock Plymouth and Ramcharger Dodge, the Max wedge featured high flow cylinder heads developed through state of the art( at the time) airflow testing.[4] They had 1鈪?inch exhaust valves that required that the cylinder bores be notched for clearance. The blocks were a special severe duty casting with larger oil feed passages than other RB engines and the blocks were stress relieved by the factory. Induction came by means of a cross ram intake manifold tuned for peak power above 4000 rpm and two Carter AFB-3447SA 4 barrel carburetors. The Max Wedge also included high-flow cast iron exhaust manifolds that, on the later versions, resembled steel tube headers. The Max Wedge was factory rated at 415 or 425 bhp (309 or 317 kW) (depending on compression), and 480 ft路lbf (650 N路m) at 4400 rpm.



Before the end of the 1963 model year Chrysler introduced the Stage II Max Wedge with improved combustion chamber design and an improved camshaft. The last performance year for the Max Wedge came in '64 with the Stage III. The factory advertised power rating never changed despite the Stage II and III improvements.



There was also a "426-S" available in 1964 and 1965. It bears little relation to the Max Wedge except for basic architecture and dimensions. The "426 Street Wedge" was available only in B-body cars (Plymouth and Dodge) and light duty Dodge D Series trucks, it was little more than an increased-bore version of the standard New Yorker 413 single 4-barrel engine.Is the mopar 400cid the same block as a 426 hemi?
no its not even close,the 426 is in a class of it own on the big block engine,the 400 was a good engine but at the time it came out it wasn't very powerful,it can't be made in to a 426 either,the 426 block was one of a kind design,good luck.
You wish, the 400 was a smogged out boat anchor, just an hermaphrodite B block to meet the EPA regulations of the time, Ford tried it too, with a bored and stroked 351 Windsor, Chrysler just used a 389, both were bad ideas, but at least Ford dident screw it up as bad.