Quote:
Originally Posted by SpeedIsLife
I think where Dodge saved a lot of money is that the Hellcat motor is not a 100 percent from the ground up new motor. It has design elements from the old 6.1 and current 6.4 motors. The parts are new, but the designs are old. For example apparently the block is based off of the old 6.1 Hemi while the heads are based off of the 6.4.
I think perhaps the best analogy I can give is how the LSA is related in design to the ls3 and ls9
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The Hellcat engine block is shared from the 6.4L RAM engine. The thing that made it a 6.2L is the shortened stroke. The heads are Apache heads and are used on all of the 392 engines.
ZL1 - 4.06 bore x 3.62 stroke
H/C - 4.09 bore x 3.58 stroke
The 3.58 stroke is the same stroke used in the 5.7L Hemi (just a beefed up crank). The 4.09 bore is used in all 392 engines. There are, however, two different blocks; a beefed up version that is used in the RAM and the regular version used in the SRT car lineup.